Sunday, January 25, 2015
Health Benefits of Resveratrol: New Plaudits
Saturday, January 3, 2015
Happy Thoughts Can Make You More Competent
“Life, liberty, and the pursuit of happiness:” some people might argue that the U.S. Constitution endorses hedonism, and indeed many politicians want to ignore or get rid of the Constitution, but not necessarily because of hedonism. We should not be dismissive about encouraging people to pursue happiness. Happiness can be good for your brain. Depression is surely bad for your brain.
Positive mood states promote more effective thinking and problem solving. A recent scholarly report[1] reviews the literature demonstrating that positive mood broadens the scope of attentiveness, enhances semantic associations over a wider range, improves task shifting, and improves problem-solving capability. The review also documents the changes in brain activation patterns induced by positive mood in subjects while solving problems. Especially important is the dopamine signaling in the prefrontal cortex.
Published studies reveal that a variety of techniques are used to momentarily manipulate mood. These have included making subjects temporarily happy or sad by asking subjects to recall emotionally corresponding past experiences or to view film clips or hear words that trigger happy or sad feelings,
The effect of happiness on broadened attentiveness arises because the brain has better cognitive flexibility and executive control, which in turn makes it easier to be more flexible and creative. Happy problem solvers are better able to select and act upon useful solutions that otherwise never consciously surface. Happiness reduces perseverative tendencies for errant problem-solving strategies. The broadened attentiveness, for example, allows people to attend to more stimuli, both in external visual space and in internal semantic space, which in turn enables more holistic processing. For example, in one cited study, experimenters manipulated subjects’ momentary mood and then measured performance on a task involving matching of visual objects based on their global versus local shapes. Happy moods yielded better global matching.
Other experiments report broader word association performance when subjects are manipulated to be happier. For example, subjects in a neutral mood would typically associate the word “pen” as a writing tool and would associate it with words like pencil or paper. But positive mood subjects would think also of pen as an enclosure and associate it with words like barn or pigs. This effect has been demonstrated with practical effect in physicians, who, when in a happy mood, thought of more disease possibilities in making a differential diagnosis.
The review authors reported their own experiment on beneficial happy mood effects on insightfulness, using a task in which subjects were given three words and asked to think of a fourth word that could be combined into a compound word or phrase. For example, an insightful response to “tooth, potato, and heart” might be “sweet tooth, sweet potato, and sweetheart.” Generating such insight typically requires one to suppress dominant “knee jerk” responses such as associating tooth with pain and recognize that pain does not fit potato while at the same time becoming capable of switching to non-dominant alternatives.
Other cited experiments showed that happy mood improved performance on “Duncker’s candle task.” Here, subjects are given a box of tacks, a candle, and a book of matches, and are asked to attach a candle to the wall in a way that will burn without dripping wax on the floor. Subjects in a happy mood were more able to realize that the box could be a platform for the candle when the box is tacked to the wall.
Such effects of happy moods seem to arise from increased neural activity in the prefrontal cortex and cingulate cortex, areas that numerous prior studies have demonstrated as crucial parts of the brain’s executive control network. Similar effects have been observed in EEG studies. Other research suggests that the happiness effect is mediated by increased release of dopamine in the cortex that serves to up-regulate executive control.
The review authors described a meta-analysis of 49 positive-psychology manipulation studies showing that momentary happiness is readily manipulated by such strategies as deliberate optimistic thinking, increased attention to and memory of happy experiences, practicing mindfulness and acceptance, and increasing socialization. The effect occurs in most normal people and even in people with depression, anxiety, and schizophrenia. Biofeedback training, where subjects monitor their own fMRI scans or EEGs, might be an even more effective way for people to train themselves to be happier.
The main point is that people can be as happy as they choose to be.
Tuesday, December 23, 2014
Grit's Role in Learning
Monday, December 22, 2014
Top Ten Brain Posts 2014: 6-10
It is always informative to find the posts that generate the most site visits. I am surprised at some of the posts that make the list and at some of the posts that do not.
Here are the posts making the list for 2014 beginning with number 10. Clicking on the post title will link you to the full post.
Naptime Stories Boost Word Learning in Children
This post summarized an interesting study of reading and word memory retention in children. It highlights the importance of sleep for memory consolidation and retention. The time immediately proceeding naps is an important time to use for teaching.
The Genetics of Religious Belief
In April, I reviewed some recent brain research related to religion and religious belief. The number 9 most viewed post examined a twin study of religious belief. This study found important genetic contributions to adult religious belief and attendance. Apparently, genetic brain wiring contributes to our later religious affiliation.
The Social Brain: Weeking Reading Links
In 2014 I started posting links to a list of abstracts I felt were important. These came from my PubMed searches on specific topics. Some abstracts were later give a full post but many did not. The Weekend Reading links on the Social Brain was popular and ended up number 8 on the Top Ten list.
Is Insomnia Relief Just a Mouse Click Away?
The number 7 ranked post for 2014 was a review of an internet-based cognitive behavioral treatment for insomnia. This study supported the value of this approach and holds the potential to make CBT treatments more accessible and potential more affordable. Look for more studies of using internet and mobile health approaches for the treatment of common medical conditions.
Acute Brain Response to Exercise in Healthy Adults
There are both acute and chronic effects of exercise on the brain. The number 6 most viewed post this year highlighted a study of acute effects of exercise on healthy adults. The study used advanced brain imaging techniques and demonstrated changes in the pattern of blood flow distribution with exercise. These changes may contribute to the known beneficial effects of exercise on brain plasticity.
Merry Christmas and Happy Holidays! I will post the top five viewed posts next week.
Photo of angel Christmas ornament is from the author's files.
Follow the author on Twitter WRY999.
Saturday, August 30, 2014
Handwritten Notes Lead to Better Learning
Sunday, July 27, 2014
Educational Reform. Why It Is Not Working.
Tuesday, May 6, 2014
Jazz Changes the Brain
To follow up my prior post on jazz, I just read a scientific report published last week that suggests that training of musical creativity in jazz causes long-lasting changes in brain function. In this study, musicians completed a questionnaire that allowed researchers to know the extent of each subject's prior classical and jazz training. Functional MRI brain scans were taken with subjects lying down on their back with a piano keyboard on their lap, playing improvisations with their right hand. Ear phones allowed players to hear their improvisations.
Brain scan showed distinct activity differences in the jazz musicians and that difference was greater in those with longer jazz histories. Past improvisation experience increased the functional bilateral connectivity of the dorsal premotor cortex, the pre-supplemental motor areas of cortex, and the dorsolateral prefrontal cortices. Decreased activity connectivity was noted in executive control frontal-parietal areas. Thus, it would seem that creativity training, in jazz at least, changes the brain at a network level. Presumably, these connectivity changes were created by past histories in learning jazz and no doubt facilitated improvisation by automating some of the neural functions needed to perform it.
How do we interpret the decreased activity in executive-control areas of cortex? Multiple other brain-scan studies in other contexts have indicated that as a brain becomes proficient in a certain task, apparently less neural tissue is needed to perform the task. Decreased activity can therefore indicate task mastery.
Scientists have known for a decade or more that learning and memory in general change both brain anatomy and function. Such changes are typically linked to the neural requirements for performing specific kinds of tasks. This study of classical and jazz musicians follows on prior studies showing that musical training does change the brain. For example, violin players have enhanced neural activity in the motor cortex controlling hand movements. The relative size of the left and right motor cortex differs between piano and string players.
The importance of this present study is that it demonstrates that the brain change depends on the kind of musical training and appears to be selective for improvisation. Moreover, musical improvisational training affects more than just control over movements and extends to cognitive functions needed to improvise. Improvisation is a creative act that apparently recruits cortical circuits to support it and in the process rewires the brain to facilitate improvisation.
Improvisation relies heavily on memory of previously learned musical patterns and implementation strategies. Jazz players call this "musical vocabulary." Thus, jazz players have to become musicians first, then learn how to improvise. Because memory is a "process in a population, not a thing in a place," neural representation of musical vocabulary is probably widely distributed, and the brain must learn how to recruit connections from multiple brain areas and integrate them in real time in the prefrontal and movement-control parts of the brain, which apparently generate creative ideas and implement them.
Source:
Pinho, A. L. et al. (2014) Connecting to create: expertise in musical improvisation is associated with increased functional connectivity between premotor and prefrontal areas. J. Neuroscience. 34 (18): 6156-6163. doi: 10.1523/JNEUROSCI.4769.13-2014.








