Natural Strategy to Protect Memory and Cognition

Although the brain modifications with age, a growing frame of studies shows that life-style elements consisting of social sports, intellectual stimulation, physical hobby and weight loss plan play a key role in retaining cognitive fitness. Far from being an "inevitable" outcome of growing old, we now realize that cognitive decline and memory deficits are the predicted consequences of a lifetime of oxidative and inflammatory damage that limits the potential of brain cells to speak with one another. We live in great instances and there may be no doubt in my thoughts that it is able to have an effect on your fitness. Social and monetary problems on a global scale offer an infinite circulation of stress. The mixture of stress and the growing range of environmental pollution offers a one- punch that can affect your health. One of the fastest-growing segments inside the global population is the elderly. We are dwelling longer than ever earlier than in records. This must be a call to motion for imposing techniques for keeping cognitive fitness for each individuals and societies.

A important step in defensive cognitive fitness is to take away, or at least limit the intake of neurotoxins, synthetic chemical compounds which have a dangerous impact on the brain. This isn't always as clean as it is able to appear. The Environmental Working Group (EWG) these days posted consequences of a study to learn the way early in life do artificial chemicals starts offevolved to accumulate in the body. Researchers analyzed blood samples taken from toddlers, born in U.S. Hospitals, for the presence of more than four hundred commercial and customer product chemical compounds. The consequences were startling. Researchers discovered that the infants averaged 200 contaminants of their blood. Among the pollutants diagnosed changed into insecticides, mercury and a distinctly new-comer to the neurotoxins listing, PFOA, which is a chemical used within the manufacture of Teflon. In total, the babies' blood contained lines of 287 chemical compounds lots of that are well-mounted neurotoxins.

Plant-Based Antioxidants

First and foremost, a healthful weight loss plan is critical to retaining cognitive health. In reality, the food picks made all through a life-time, can growth, or lower, the threat for lots age-related illnesses that purpose untimely death or incapacity. A assessment of numerous lengthy-time period research conducted with the aid of the Harvard School of Public Health, and related to almost 300,000 topics indicates that topics whose weight-reduction plan contained the maximum plant-primarily based antioxidants, had the bottom danger for breast and prostate cancers, heart disorder, diabetes, and stroke. Eating fresh culmination and greens is important to your health, but equally essential is that they may be herbal and freed from any pesticide residue. Remember, on the subject of meals, excellent continually trumps amount.

It is vital to very well rinse all produce, even better, buy as much organic produce as possible. Despite careful washing, conventionally-grown produce will constantly include systemic pesticide residue. For this motive on my own, it is exceptional to shop for organically grown produce, which isn't always hard to find in recent times. Large grocery chains like Wal-Mart now have entire sections dedicated to organic and natural foods. However, natural produce need to nevertheless be rinsed beneath running water to cast off any microorganisms at the floor. According to the CDC, meals borne illnesses are responsible for more than 250,000 emergency room visits each year.
There is overwhelming medical proof that even small doses of insecticides, and different chemical substances, can motive critical health situations, particularly all through early youth. I have read enough approximately those poisonous chemical compounds to recognise that they have to be avoided at all expenses. Buy as many organic culmination and vegetables as viable, and if there are nearby farms inside the place, get to the neighborhood farmers market. Once you attempt nearby produce, you will never once more accept the washed-out flavor of products shipped thousands of miles throughout the united states. Support your neighborhood farmer; they're a vanishing breed.

Dietary Fat - Brain Food

Despite the significance of clean end result and greens, to preserve cognitive health your weight-reduction plan ought to comprise wholesome dietary fats. The controversy surrounding fat makes no experience to me. Today, with more than 60% of the population overweight, fat has become a demon. Conventional questioning is consuming low-fat and preserving your blood cholesterol levels as little as feasible. However, becoming a fat-phobic is arguably the worst scenario on your mind. Removing dietary fat from the eating regimen, deprives the mind of one among its maximum distinguished constructing blocks. Researchers from Boston University currently finished a evaluate of facts on greater than 2,000 males and females who firstly participated in the Framingham coronary heart observe. The reason of the evaluation become to decide the relationship between overall ldl cholesterol and cognitive characteristic. Published effects showed that not having ENOUGH nutritional ldl cholesterol may want to create a measurable loss in cognitive functioning. The individuals with the lowest levels of cholesterol done poorly on reminiscence, awareness and phrase fluency exams in eighty% of the instances while in comparison to the excessive-cholesterol (240-380) ranges.

Exercise Your Brain

Little greater than a decade in the past, scientists idea that the mind changed into hardwired and as we elderly and the hardwired connections commenced to fail, so did the mind. We have on the grounds that found out that with a minimal quantity of physical workout, intellectual stimulation and right vitamins, age-associated memory deficits and cognitive decline can be minimized. We now see it is viable for the mind to searching for new connections while vintage ones fail. Memory exists due to the fact there may be communication among tens of millions of brain cells. When mind cells die, it stops communication in that section. However, given the right stimulation, your mind will seek an alternate route around the damaged cells. Just as muscle tone improves with physical exercise, reminiscence can be progressed with highbrow stimulation. Your mind is constantly reorganizing and growing throughout your life. It is intellectual stimulation that encourages your mind to enlarge. Scientists now accept as true with that this improvement and reorganization can retain well into antique age.

Challenging your mind with unique experiences is what stimulates your brain to grown and re-join in complex ways. It is vital to venture your mind to learn new and unique obligations. Good exercise for the mind is reading a ebook, or a magazine or the every day newspaper. Learning a Tai chi or yoga recurring is an extremely good way to achieve fitness above and underneath the shoulders. If you are proper-handed strive the usage of your left hand extra in the course of the day. Switch the hand you're the usage of to manipulate the pc mouse. It will feel uncomfortable for some time, but with exercise, you'll be amazed at your development. Try this exercising with other not unusual duties. Use your opposite hand to comb your tooth, dial the telephone or control the TV faraway. It may additionally sense uncomfortable, however the thoughts is learning a new skill and it will fortify neural connections or even create new ones. Your mind needs regular workout to stay in top shape.
Brain scans confirm that once learning new competencies, there is an extended blood waft to occasionally-used areas of the brain. It is the mind looking for new connections wherein none existed earlier than. To keep healthy cognitive feature, one need to mission the mind every day. Learn to play chess or a musical tool. Try mastering a brand new language or collaborating in social sports. Science has proven that social interplay can hold reminiscence and cognitive feature. Keeping your brain involved will preserve it younger.

Physical Activity and Brain Function

Researchers at the University of Illinois at Urbana tested the consequences of workout and physical fitness on reminiscence, cognitive characteristic and mind structure. They centered on the hippocampus, a brain shape that is important to reminiscence. The feature of the hippocampus is intently related to length. Most scientists agree that a larger hippocampus can predict better reminiscence characteristic. Currently, researchers are finding that bodily fit seniors tend to win in hippocampus shape and feature. Although the hippocampus shrinks with age, physically suit seniors have a tendency to have larger hippocampi. In a look at posted within the Journal Hippocampus, hippocampus length in physically healthy seniors debts for forty% of their memory benefit. This landmark have a look at changed into the primary to prove that workout can have an effect on hippocampus size in people, a fact that had been previously set up in numerous laboratory animal research. Participants within the take a look at, 59 to eighty one years of age, walked for thirty minutes three days every week. The researchers, using MRI imaging, ought to see a distinction in the structure of the hippocampus, and when the contributors have been examined there has been a fifteen% improvement on reminiscence and attention. We are starting to recognize that the mind is continuously adapting and re-wiring self. Even as we age, the brain is capable of growing.

Share:

Read More

The way to growth reminiscence electricity - guidelines to boost Your brain power

Getting to know the way to growth reminiscence strength may be an irritating procedure for many people. Some sense that people in general either have an excellent reminiscence or don't. Although sure human beings do have an innate ability to examine faster or keep information, memory is similar to a muscle that can be reinforced the use of techniques and exercises.

probably one of the maximum commonplace ways of the way to growth reminiscence electricity is through using mnemonics.

Mnemonics are basically phrase or photo associations which while thought about can remind you of positive events, matters, names, and so forth.

As an example, returned in school you may have heard of a totally famous man named "Roy G. Biv." even though Roy G. Biv is not an actual character, that call might also remind you of all the colors of a rainbow and which order they come in. Red, Orange, Yellow, inexperienced, Blue, Indigo and Violet.

Some other instance is for music students who're trying to learn how to study song. Perhaps you have heard of the phrase "each correct Boy Deserves Fudge," or a variant of it. Again, the usage of the first letters of this mnemonic we're capable of establishing the names of the notes on each line of a treble clef. E, G, B, D, and F.

that is what we call a first letter mnemonic and can be carried out to dozens of conditions. by way of practicing creating your own mnemonics, you can virtually teach your brain to search for these quicker, and remember them quicker.

In the same useless, you could use visualization techniques as the approach of the way to increase reminiscence electricity. Again, this is considered a mnemonic, however, makes it so when you think of a specific component, it'll relate to stuff you want to bear in mind.

Allow's take studying a brand new language as an example. It may be sincerely tough to keep in mind vocabulary mainly in case you're now not inside the position to apply it day by day. But if we use a visualization mnemonic, we will educate our mind to companion images with phrases or phrases.

In jap, the word for "suitable night time" is "Oyasuminasai." It sounds a lot specific than its English counterpart that it could thoroughly be hard to recall. However, in case you had been to think about an image associated with the word, inclusive of a big complete moon on a clear night time's sky, after which think about the word "oyasuminasai" again and again whilst nevertheless visualizing the moon, your brain would recognize that those two relate by some means. So the next time you try to recall what the Japanese word for "proper night time" is, you will consider the big moon, and the word "oyasuminasai."

similarly to mnemonics, you could use physical activities that boom your concentration so that it will add significantly help you in your quest of how to increase memory strength.

The best one you can do is referred to as the "Candle watching exercising." With this workout you without a doubt mild a commonplace dinner candle and the area it approximately arms length away from your body in a darkened room. You need it to be at around eye level.

Now, close your eyes and clear your thoughts as first-class you as can. When you are prepared, open your eyes and gaze at the candle without blinking. Try to consciousness at the torch as a whole lot as feasible. In case your eyes to start to water and you experience the need to flash, near your eyes and try to visualize the candle.

In this state, you should try and do not forget all of the little information on the candle. At the beginning this may be hard as you aren't skilled but, so don't be discouraged if the torch appears a bit fuzzy in your thoughts.

Share:

Read More

The way to enhance memory and attention today!

Who else has experienced the disappointment of now not being capable of don't forget important daily tasks, or possibly wherein you left a few property? if you are scholar, you can relate to the lack of ability to concentrate to your studies, likely because of a few type of outside distractions. luckily, a large percent of not unusual reminiscence frustrations can be conquer simply via paying more attention, and getting to know a way to improve reminiscence and awareness at the identical time.

One interesting reality about memory is which you handiest need to pay attention on something for eight or so seconds to place it into your lengthy-term reminiscence. if you overlook to pay attention while trying to understand that vital bit of facts, you possibly may not take into account it later. alas, our loss of concentration blocks the facts from being sent to the memory a part of the mind. I know that one of the maximum irritating things that I do is overlook wherein I put my sunglasses and cell phone, and am usually attempting to find them while i am seeking to depart the residence. Then you need to spend a gaggle of time looking around for some thing it's miles which you out of place. the majority forget about in which they left matters due to the fact they may be now not paying attention to where they set it down. an amazing strategy is to ignore the things which can be happening around you and simply concentrate on the chore at hand. Make a verbal note to yourself where you're leaving a positive object, surely say it out loud, and you will more likely recollect wherein it's miles later.

while getting to know a way to improve reminiscence and awareness, one of the most essential competencies to master is being able to become aware of the unique distractions which might be maintaining you from concentrating on what you are operating on. it is able to be noise, different human beings speakme to you, or something internal like demanding about some different problems. if you are distracted by means of other concerns on your lifestyles, make a address yourself to take time for those particular gadgets later. you could even write down what's bothering you, then guarantee your self that you may worry approximately it later while you are completed with anything it's far you are doing now.

attention to enhance the memory of what's being examine is another commonplace goal amongst many folks accessible who've a tough time comprehending what they are studying. you could improve your odds of maintaining written records through analyzing aloud the elements that are most crucial, and you may have a better threat of memorizing them. If others around you might be aggravated through you analyzing out loud, simply try to boom your stage of concentration, and you will discover that you may take into account a lot more of what you are reading.

There are tons of techniques and tips you may encounter when mastering a way to enhance memory and attention, and some are higher than others. To sincerely be capable of plant crucial data in your lengthy-term memory though, you should understand that better awareness without a doubt is the number one secret to improving memory. begin striving to enhance this one talent, and you will quickly see that your memory is improving proper together with your new observed potential to concentrate.

Share:

Read More

How Learning and Memory Relate to Free Will

One common definition of "free will" is that a person can decide or choose among multiple alternatives without being forced by physical laws, luck, fate, or divine will. Most of us feel we are in charge of our choices when no outside force requires us to make a particular choice. But it is fashionable these days for scholars to insist that free will is an illusion, a trick the brain plays on us. I will spare you the philosophical knots of specious assumptions and convoluted logic that that scholars tie themselves into.

Why do I bring this up? What has the "free will" issue have to do with learning and memory? Everything. Rather than memory dictating our choices, either we have chosen what to learn and remember or we can veto or amend the influence in our decision-making.

Human brains make choices consciously and unconsciously by real-time evaluation of alternatives in terms of previous learning from other situations and their anticipated usefulness. This learning occurs in the context of the learned sense of self, which begins unconsciously in the womb. The conscious brain is aware that it is aware of choice processing and makes decisions in light of such understanding. When a given alternative choice is not forced, the conscious mind is aware that it is not obliged to accept any one choice but is "free" to select any one of the available options. Such realization might even guide many decisions at the subconscious level. In either case, neural networks weigh the probable value of each alternative and collectively reach a "decision" by inhibiting networks that lead to less-favored alternatives. Thus, network activity underlying the preferred choice prevails and leads to a selective willed action. What governs the network activity causing the final choice is the activity in other networks, which in turn is governed by stored memories and real-time processing of the current environmental choice contingencies.

What usually gets left out of free-will discussions is the question of how a brain establishes stored-memory preferences and how it evaluates current contingencies. These functions surely cause things to happen, but what is the cause of the cause? Any given brain can choose within certain limits its learning experiences and stored memory. We govern those choices by what a brain has learned about the self-interest value associated with given contingencies. Brain circuitry assigns value, and values chosen are largely optional choices. The conscious brain directs the choices that govern value formation, reinforcement, and preservation in memory.

Now we are confronted with explaining how neural circuit impulse patterns (CIP) representing the sense of self can have a free will. First, I reason that each person has a conscious Avatar that brain acts as an active agent to act in the world on embodied brain's behalf, as explained more completely in my recent book. This is reminiscent of the 3rd Century idea of a homunculus, a "little person" inside the brain. The modern view is that this homunculus exists in the form of mapped circuitry.

Certain maps are created under genetic control. These include the topographic map of the body in the sensory and motor cortices. Then there is the capacity for real-time construction of maps of the body in space that resides in circuitry of the hippocampus and entorhinal cortex. Other maps are created from learning experience from the near-infinite circuit capacity of association cortex. What these maps learn is stored in memory as facilitated circuit synapses and deployed "on-line" in the form of CIP representations of what was originally learned. New learning likewise exists as CIP representations in sub-network populations.

The Avatar itself is a constellation of CIPs representing the conscious sense of self. Certainly, by definition, the Avatar can make choices and decisions. Wakefulness releases consciousness to make its own choices and decisions. Avatar processing is certainly not random, and presumably can occur with more degrees of freedom than found in unconscious mind.

If the Avatar exists as CIPs, how can something as "impersonal" and physiological as that have any kind of "will," much less free will. Let us recall that "will" is little more than an intent that couples bodily actions to achieve the intent. This kind of thing occurs even in the circuitry that controls unconscious minds. These circuits automatically generate actions in response to conditions that call for a response. Such actions are stereotyped and inflexible only when there is no conscious oversight.

Each alternative is represented as circuit impulse patterns (CIPs) within a subpopulation of brain, which be considered as constituting part of the sub- or non-conscious mind. Each population's activity interacts with the others - and with the CIP representation of the Conscious Avatar. When activity level in any one subpopulation reaches a threshold, it suppresses activity in the alternative representation populations, leading to selection of that population's activity as the choice result. The Avatar CIP is poised to influence activity in the alternative sub-populations and thus can help direct the final processing result.

The Avatar must have some criteria that its circuits use to make a given decision. Those criteria have been learned and remembered. When CIP processes operate in Avatar circuitry, the Avatar population activity can modulate the alternative-choice representations in the context of self-awareness according to the informational representations of past learning and value assessments of current contingencies. You might say that when the brain generated the CIPs to represent the sense of self, those CIPs came endowed with a certain autonomy and freedom of action not available to the other CIPs in the brain that constituted unconscious mind.

People who believe that humans have no free will are hard-pressed to explain why no one is responsible for their choices and actions. What is it that compels foolish or deviant behavior? Is our Avatar compelled to believe in God or to be an atheist? Is our Avatar compelled to accept one moral code over any other? Is it compelled to become a certain kind of person, with no option to "improve" itself in any self-determined way? Do learning experiences compel us to make our choices of learning experiences? Of course not. We are free to reject learning that does not serve us well.

It seems to this Avatar that current debates about determinism and free will tend to obscure the important matters of our humanness. The door to understanding what is really going on is slammed shut by assertions that value choices and the decisions that flow from them cannot be free because they are caused by neural circuit impulse patterns. Free will debates distract us from a proper framing of the issues about human choices and personal responsibility.

While it is true that genetics and experience help program the Avatar circuitry, the Avatar does its own processing and makes choices about who to interact with and what experiences to value, promote, and allow. The Avatar can insist that it has a need to remember some lessons of experience and makes it a point to remember it. In short, the Avatar gets to help shape what it becomes.

Sources:

Klemm, W. R. (2014). Mental Biology: The New Science of How the Brain and Mind Relate. New York: Prometheus.

Klemm, W. R. (2016). Making a Scientific Case for Conscious Agency and Free Will. New York: Academic Press.

Share:

Read More

Two New Discoveries to Explain Why Exercise Is Good for You

Have you noticed that so many elderly people seem frail, walk slowly, and seem to lack energy? If this applies to you, noticing it is unavoidable. These problems are preventable. For 25 years, I jogged at least a mile and a half three times a week. This was crucial for helping me stop smoking. I don’t know why, except that I could not smoke and jog at the same time. Also, the 15-30 minute recovery time reminded me just how bad the smoking had been for my health.

Why did I quit jogging? The jogging messed up my joints. So, I took up swimming, but since I sink like a lead mannequin, that is just too much work. So now, I joined a gym, where I use the elliptical, treadmill, and muscle-building machines. This environment helps because I have companions in my discomfort, and occasionally I get the satisfaction of comparing myself to the few “90-pound weaklings” that show up.

We have known for many years that exercise is good for you, especially as you get older. Known benefits of exercise include:

• Relieve stress and promote a sense of well being. (Well, at least after the soreness wears off).
• Improve heart and cardiovascular function. (If the damage is already done, don’t expect huge improvements).
• Lose weight. (Pushing away from the table is the best exercise for this effect).
• Strengthens bones. (Reduces loss of bone density in old age. But high-impact exercise may damage joints).
• Lower blood sugar and help insulin work better.
• Help quit smoking. (Ever try to smoke while jogging? Ha!).
• Improve mood and resist depression. (Ever heard of “runner’s high? It comes from release of endogenous opiates).
• Releases proteins and other chemicals that improve the structure and function of your brain. (Memory ability improves too).
• Improve your sleep. (I mean, besides making you really tired. To reduce interference from soreness, take acetaminophen before bed time).\
• Reduce your risk of some cancers, including colon, breast, uterine, and lung cancer.

What was not as well known until recently was the effect of exercise on the immune system. Recent research indicates that exercise in older age can prevent the immune system from declining and protect people against infections. A recent study followed 125 long-distance cyclists, and found that some of those in their 80s had the immune systems of 20-year olds. Maybe this is a reason exercise can help prevent cancer.

The key indicator was the level of T-cells in the blood. T cells, named after the thymus where they first appear, are a type of white blood cell that makes antibodies. As people age, the thymus gland, located in the neck, shrinks and T-cell activity resides mostly in bone marrow. The study of cyclists revealed that they were producing the same level of T-cells as 20-year olds, whereas a comparison group of inactive older adults were producing very few. Thus, it would seem that, though not tested in this study,   physically active seniors would also respond better to vaccines than sedentary people.

The other new discovery is the importance of exercise on brain white matter integrity. White matter electrically insulates nerve fibers, which has two effects: 1) speeds communication in neural networks and 2) reduces “cross talk” among adjacent fibers. The study compared people averaging 65 who were mentally normal and those who had mild cognitive impairment, which is a risk factor for later development of Alzheimer’s Disease. In both groups, investigators measured cardiovascular function with a standard measure of heart and respiratory fitness, the VO2 Max test. They also used brain scans to measure white matter integrity. Levels of physical activity were positively associated with white matter (WM) integrity and cognitive performance in normal adults and even in patients with mild cognitive impairment.

Given all this, how much more reason do you need to get off the couch and start moving? Besides, at the end of a good workout, it feels so good to quit.

*****

"Memory Medic's latest book is for seniors: "Improve Your Memory for a Healthy Brain. Memory Is the Canary in Your Brain's Coal Mine," available in inexpensive e-book format at https://www.smashwords.com/books/view/496252.  See also his recent books, "Memory Power 101" (Skyhorse), and "Mental Biology. The New Science of How the Brain and Mind Relate" (Prometheus).

*****

Sources:

Ding, Kan, et al. (2018).Cardiorespiratory fitness and white matter neuronal fiber integrity in mild cognitive impairment. Journal of Alzheimer's Disease, 61(2), 729-739.

Duggai, Niharika A. et al. (2018). Major features of immune senescence, including reduced thymic output, are ameliorated by high levels of physical activity in adulthood. Aging Cell. 8 March. 

https://doi.org/10.1111/acel.12750.

https://medlineplus.gov/benefitsofexercise.html

Share:

Read More

The Better Things Get, the Worse They May Seem

“Too much of a good thing” and “it’s all relative” now take on new meaning. A new research report of seven studies suggests an explanation for the paradox that humans misjudge the extent of a changing situation. This report, published in the June 29^th issue of the premier journal, Science, demonstrated that people often respond to diminished prevalence of a stimulus by expanding their perception of its prevalence. For example, when looking at a matrix panel of blue and purple dots, if the experimenter reduces the percentage of blue dots, the subjects began to see purple dots as blue. Or when shown panels of threatening faces mixed with neutral faces in which the percentage of angry faces became rarer, they began to see neutral faces as threatening. Or when unethical requests of the subjects were made rarer, subjects began to regard innocuous requests as unethical. In other words, reduced prevalence of a certain stimulus created a bias for finding more of that stimulus than actually existed.

The investigators began with the blue/purple dot test. When they saw the biasing effect of reducing incidence of blue dots, they wondered if this same principle applied to other kinds of stimuli and to more abstract comparisons. The bias showed up also in their test with angry and neutral faces and in the test with unethical and innocuous requests.

Everyday experiences suggested this research. For example, others had reported that when unprovoked attacks and invasions decline, the perception of new instances receive magnified judgement. I might speculate that the empowerment of women by the women’s rights movement has made recent incidents of sexual harassment more notable than would have been the case years ago when it was not so unexpected. Or perhaps the current outrage over illegal immigrant children separated from their parents and attempts to close the border are magnified by the fact that so many have been already reunited and set free in the U.S.

The authors rightly concluded, “These results may have sobering implications. Many organizations and institutions are dedicated to identifying and reducing the prevalence of social problems, from unethical research to unwarranted aggression. But our studies suggest that even well-meaning agents may sometimes fail to recognize the success of their own efforts.”

They add reference citations that show that societies have made “extraordinary” progress in solving a wide range of social problems, but that the majority of people think the world is getting worse. In prosperous countries, like the U.S., social problems usually continue to improve. However, many people in such environments seem to keep finding more and more things to complain about. For example, as the economy improves, it seems increasingly easy to find poverty or wealth gaps. As civil rights improve, it seems easy to find abuses and even to misinterpret neutral events as abuse. Thus, despite all progressive efforts, the problems seem intractable, when in fact they are not. Politics is contaminated by flawed judgment caused by changed prevalence of social problems contaminates our politics.

We tend to cling to old myths when they no longer apply as well as before. This diminishes appreciation of the successes of government policy. In the U.S., the growing hostility of citizens toward their country may actually be the result of the improvements in the country. Compounding the problem is the common feeling that it is not politically correct to consider that this kind of bias might exist. Even when a person knows of this bias, sometimes it is of political benefit to keep contentious issues alive.

Help kiddos get ready for school. 

My popular, 5-star book,Better Grades, Less Effort, is now available in hard copy. from all bookstores and Amazon 

Source:

Levari, David E. et al. (2018). Prevalence-induced concept change in human judgment. Science. 360(6396), 1462-1467.

Share:

Read More

Consciousness Explanation. Part II

In an earlier post, “Where Neuroscience Stands in Understanding Consciousness,” I presented a summary of the progress occurring in neuroscientific understanding of consciousness (https://www.psychologytoday.com/us/blog/memory-medic/201804/where-neuroscience-stands-in-understanding-consciousness).

Now a recent report in the May issue of Science adds to a growing understanding of how the brain generates conscious recognition. The study examined neural impulse discharge responses of monkey brain to visual stimuli. Electrodes were implanted in the four visual cortex areas that are sequentially activated by visual stimuli. The stimulus was a circular spot of varying contrast in the lower left area of the visual field. Monkeys were cued when a stimulus was delivered, though whether they saw it or not varied with the spot’s contrast against the visual background. Monkeys were trained to report when they knew they saw the spot by shifting  their gaze from a central fixation point to the spot’s prior location some 450 msecs earlier. Monkeys reported unrecognized spots by shifting the gaze to the right of the default fixation point. Investigators imposed the delay for reporting to eliminate the response being a simple reflex saccade. A longer delay would have been more convincing, but it might have taxed the monkey’s working memory and easy distractibility.

As expected, spots of sufficient contrast evoked impulse discharge in each of the four visual cortex regions. Whether or not the monkey reported actually seeing the spot depended on whether there was also increased impulse discharge in the region of frontal cortex that had implanted electrodes. No doubt, other non-monitored frontal areas might also have been activated under conditions where recognition was reported. The point is that conscious recognition requires activation of widely separated brain areas at the same time.

Not demonstrated here is how the frontal activity is interacting with activity in the visual cortex areas, but that certainly could be predicted from studies in my lab, reported in 2000. We showed that conscious realization of alternate perceptions of ambiguous figures in humans occurred when brain electrical activity (EEG) over the visual areas of scalp became highly synchronized, over a wide range of frequencies with multiple frontal areas, both in the same and even opposite hemisphere. Figure 1 shows the topography of coherence change at the moment of realization for the upper frequency band of 25-50Hz.

Figure 1. Topographic summary of p<0.01-level coherence increases across all 10 ambiguous figures, all subjects, in the 25-50 Hz band. Each square matches a given electrode and shows how activity at that location became more coherent with activity at other locations at the instant the subject consciously realized the alternate perception in any of 10 ambiguous figures. From Klemm et al. (2000). Widespread coherence increases were also seen in the band below 25 Hz.

Thus, it seems that a meaningful detectable signal, which need not be limited to vision, not only activates its immediate neural targets, but those target cells can trigger feed-forward to trigger activity in more frontal areas. Feedback from those frontal areas can set up time-locked oscillatory coupling across wide expanses of cortex that is apparently necessary for conscious recognition. The time locking probably amplifies the signals to the threshold for conscious realization.

The distributed signal processing does not necessarily mean consciousness requires huge expanses of neural tissue. Recall from the split-brain studies in Roger Sperry’s lab that even half a brain can be fully conscious of the stimuli it can receive. The magic of consciousness seems to lie in the qualitative nature of data sharing, not in the volume of tissue involved.

Thus, the major issue is how oscillatory coupling of otherwise isolated circuitry amplifies signals to become consciously recognized. “Amplify” may be a misleading word, inasmuch as there is no compelling evidence as yet that consciousness is related to having more nerve impulses per unit of time. The impulses certainly don’t get bigger, because their voltage magnitude is constrained by concentration and electrostatic gradients. Rather, the secret may lay in the controlled timing of impulses. A likely form of amplification results from the reverberation of activity among coherent neuronal ensembles, which could have the effect of sustaining the stimulus long enough to be consciously detected, that is, for the brain to “see” what the eyes were looking at.

Consciousness may also simply be a matter of improving the signal-to-noise ratio. Time-locked, reverberating activity should be more isolated and protected from random activity which is unreliably associated with a given stimulus. Intuitively, that is what we sense in daily experiences. When we look at a tree, the cognitive noise of the multitude of tree signals may obscure our seeing the bird in the tree until, by accident or intent, we are able to see the bird.

This still leaves us with an incomplete answer. What is it about amplifying or reducing background noise that makes stimuli consciously recognizable? Where is the “who” in the brain that does the realizing? When my brain sees or hears something, it is “I” who consciously see or hear it. How does my brain create my “I” and where in my brain is my “I?” One possibility is that the unconscious brain can release a set of unique network activity that operates much like an avatar, giving brain a functionality it otherwise would not have. I elaborated this idea in my post, “The Avatar Theory of Consciousness” (https://www.psychologytoday.com/us/blog/memory-medic/201506/the-avatar-theory-consciousness).

How does this avatar “I” find a stimulus that it recognizes? Is it searching for it, like a searchlight scanning across the cortex for stimulus-induced activity? Or maybe it is not “looking for” sensation but rather is triggered into temporary existence when a stimulus acquires the needed threshold to launch consciousness. The monkey experiments support the latter option. However a stimulus becomes recognized, the awareness may outlast the triggering. We often consciously think about the meaning of a momentary stimulus, integrate it with memories, and develop beliefs, intentions, and responses, either cognitive or behavioral or both.

One more thing needs mention. In the monkey experiments, it was clear that the monkeys were continuously awake, even when they were not detecting presented stimuli. Thus, being awake is not the same as being conscious. We know this also from human experiments on inattentional blindness, which reveal that consciousness depends on selective attention. Wakefulness is a necessary condition for consciousness but not, by itself, sufficient.

For more explanation of brain function, see my book:

Mental Biology. The New Science of How Brain and Mind Relate.

Sources

Van Vugt, Bram, et al. (2018). The threshold for conscious report: signal loss and response bias in visual and frontal cortex. Science. 360 (6388), 537-542.

Klemm, W. R., Li, T. H., and Hernandez, J. L. (2000). Coherent EEG indicators of cognitive binding during ambiguous figure tasks. Consciousness & Cognition. 9, 66-85.

Share:

Read More