Posts Tagged ‘Cognitive Exercise’

Reading a Novel Affects the Connectivity in the Brain

December 11, 2016

This post is based on an article in BRAIN CONNECTIVITY, Volume 3, Number 6,
DOI:  10.1089/brain.2013.0166 titled “Short and Long-Term Effects of a Novel on Connectivity in the Brain.”

This study used fMRI recording resting states both before and after reading a novel.   The novel was “Pompeii: A Novel” by Robert Fawcett.  Nineteen participants read this novel over a nine day period.  Resting-state  networks (RSNs) were assessed before and after reading on each of the nine days.  Baseline RSNs were taken five days before the experiment proper and for 5 days after the conclusion of the novel.

On the days after the reading, significant increases in connectivity  were centered on hubs in the left angular/supramarginal gyri and right posterior temporal gyri.  These hubs correspond to regions previously associated with perspective taking and story comprehension, and the changes exhibited a time course that decayed rapidly after the completion of the novel.  Long-term changes in connectivity, which persisted for several days after the reading, were observed in the bilateral somatosensory cortex, suggesting a potential mechanism for “embodied semantics.”  What the authors are referring to in embodied semantics is that the body is responding emotionally to the reading.

What HM finds most interesting about this study is that it provides data showing the
changes that take place in the brain as the result of reading.  This can be regarded as “cognitive exercise” that activates brain circuits and System 2 processing building a cognitive reserve decreasing the likelihood of Alzheimer’s and dementia.

© Douglas Griffith and healthymemory.wordpress.com, 2016. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and healthymemory.wordpress.com with appropriate and specific direction to the original content.

Cognitive Shields Protecting Against Dementia

April 22, 2015

This post is based largely on “Cognitive Shields” by Andrew Merluzzi in the .  Psychological Science Observer (February 2015, 21-28).   There have been many previous Healthymemory blog posts about autopsies of people who have exhibited no symptoms of Alzheimer’s while alive, but who nevertheless have the so-called amyloid plaques and neurofibrillary tangles which provide the definitive basis for diagnosing the disease.  Now I have a percentage to place on this statement.  About a third of post-mortem brains with the telltale features of dementia—protein tangles or miniature strokes-came from people who never exhibited symptoms during life.

The explanation that has been offered for this is that certain individuals might build buffers over their lifetimes called cognitive reserve.  This post provides information on research on the cognitive shields that build this cognitive reserve.  Actively engaging the brain can boost older adult’s recall power.  One experiment randomly more than 200 adults (ages 60-90) to engage in a particular type of activity for 15 hours a week over the course of three months.  Some activities required significant cognitive investment such as digital photography or quilting.  The other participants engaged in more leisurely activities such as listening to classical music or completing word puzzles.  At the end of the experiment participants who engaged in digital photography or quilting showed a significant improvement in memory compared to the leisurely activity participants.

Another experiment  recruited 16 older adults to play a video game called “Neuroracer.”   Participants attempted to drive a car down a virtual road, keeping constant speed and lane position.  As they were doing this they also had to pay attention to sporadically appearing shapes, pressing a button whenever they observed a green circle.  The game became more difficult as performance improved.  The comparison group played an easier version of the game where they had to drive or pay attention to shapes, but not simultaneously.  The group who played the more difficult version of the game scored better on unrelated cognitive tests. Brain imaging with an EEG revealed noticeable differences at the neural level.  Participants who played the difficult version of the game  showed more coherent activation patterns in cognitive control networks including the prefrontal cortex.  These cognitive gains were still apparent six months later.

Physical exercise is also important as it increases the flow of oxygen to the brain.  See the healthy memory blog post “To Improve Your Memory, Build Your Hippocampus” (use the healthy memory blog search box).

Another study investigated whether exercise can induce neuroprotective effects for people who have a genetic risk for Alzheimer’s.  One hundred older adults many who carried the APOE gene which increases the risk of Alzheimer’s were studied.  The participants explained their normal exercise habits and had their brains scanned twice over a period of 18 months.  It was found that exercise was critically important for the at risk group with the APOE gene.  People with this gene who didn’t exercise exhibited a 3% decrease in hippocampal volume over time.  Those carrying the gene who did incorporate exercise into their lives—more than 15 minutes of moderate exercise at least three days a week—didn’t show any decreases in hippocampal volume.  The conjectures for this result are that staying active might reduce inflammation in the brain and promote neural growth in the hippocampus building  up cognitive and brain reserve.

Research has also found that bilingual older adults have more robust white matter then monolingual adults.  This suggests that the myelin on axons in these her bundles is more intact, which would help  to buffer against age-related changes in the size and structure of the brain.  Sone also argue that it might never be too late to learn another language.  But this does take commitment.

There are many more healthy memory blog posts on the cognitive reserve and the benefits of both cognitive and physical exercise.  It is important that this information be disseminated.  People should know that they need not be passive victims of dementia, nor should they wait for a medical treatment or vaccine to treat or prevent Alzheimer’s.  To a large exert we control our own fates and should take action.

Aging and Decline: A Self-fulfilling Prophecy?

March 24, 2013

An article in the Alexandria/Arlington Local Living insert of the March 14 Washington Post titled “Getting Stronger After a Century” inspired this healthymemory blog post. This article is about a man who did not start working out until he was 98. He is now 102 and is “able to curl 40 pounds, work out vigorously on a rowing machine and deftly pluck bouncing eight-pound kettle balls from the air with the hand-eye coordination of a much younger man.” The article later states that experts say that many people don’t realize that problems they associate with old age actually are caused by poor fitness. In other words, the experts are saying that the poor fitness aging individuals experience is, in large part, a self-fulfilling prophecy. People believe that this physical decline is a natural part of aging and start declining. If people would just start exercising, they could preclude or remediate many of these problems.

I believe that the same problem occurs with respect to mental fitness. People believe that mental decline is a natural part of aging. There are data showing that the average retirement ages of countries and the age of the onset of dementia for these same countries are correlated. That is, the earlier the retirement age, the earlier the onset of dementia. It isn’t retirement per se that is responsible, but rather the decline in social interactions, cognitive activities, and challenges (problems) that result in dementia.

So if you are retired you need to keep up social interactions and cognitive activity. Use your computer and keep learning new things. Read and take classes. And you don’t want to wait until you retire to start these activities. They should be lifelong activities. Nevertheless, it is never to late to start. Consider the gentleman in the article who did not start exercising until he was 98.

As the title of this blog implies, the healthymemory blog is devoted to healthy memories. It is constantly providing new, worthwhile information for your consideration. The category of transactive memory considers how you can employ others and technology for cognitive growth and health. The mnemonic techniques category includes articles on techniques that not only improve your memory, but also provide valuable cognitive exercise. Articles on mindfulness and meditation can also be found under this category. The Human Memory: Theory and Data includes posts on this very interesting and important topic. This is a good area in which to grow cognitively.

© Douglas Griffith and healthymemory.wordpress.com, 2012. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and healthymemory.wordpress.com with appropriate and specific direction to the original content.

Cognitive Exercise and Aging

July 15, 2012

There is evidence that training older adults in memory, processing speed, and reasoning skills produces substantial improvements in these skills. Moreover, these skills maintain over a number of years.1 Studies of retirement also provide additional evidence that cognitive exercise slows down the process of intellectual decay. Episodic memory is the memory of personal events. It is among the first cognitive abilities to show a decline with age. A study of the effects of retirement on episodic memory was conducted.2 It was conducted with two groups of men: one aged 50 to 54 and one aged 60-64. Twelve nations were ranked in terms of the persistence of employment into old age. If the percentage of men still working dropped by 90% from the 50 to 54 age group to the 60 to 64 age group (Austria and France) there was a 15% decline in episodic memory. If the percentage still working dropped by 25% (United States and Sweden) the decline was only 7%.

There is also correlational evidence from a study in the United Kingdom showing that an extra year of work is associated with a delay in the onset of Alzheimer’s on average by six weeks.3 These are just a few studies from a body of research showing that cognitive exercise builds a cognitive reserve that that delays the onset of dementia and Alzheimer’s. The Healthymemory Blog respects this defensive position, but advocates an offensive rather than a defensive approach in which the goal is to continue to grow and enhance cognition as we grow older.

1Ball, K., Berch, D.B., Heimers, D.F., Jobe, J.B., Leveck, M.D. Marsiske, M.,…Willis, S.L. (2002). Effects of cognitive training interventions with older adults. A randomized controlled trial. JAMA: Journal of the American Medical Association, 288, 2271-2281. doi:10.1001/jama.288.18.2271.

2Adam, S., Bonsang, E., Germain, S., & Perelman, S. (2007). Retirement and Cognitive Reserve: A Stochastic Frontier Approach to Survey Data (CREPP Working Paper 2007/04). Liege, Belgium: Centre de Recherche on Economie et de la Population..

3Ibid.

© Douglas Griffith and healthymemory.wordpress.com, 2012. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and healthymemory.wordpress.com with appropriate and specific direction to the original content.