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Senior Citizens Should Schedule Mentally Challenging Tasks in the Morning

Older adults have ‘morning brains’ finds study showing noticeable difference in brain function across the day

Aug. 6, 2014 - Senior citizens facing a challenge that will require their brain to be working at its best should schedule it for the morning hours. A new study finds older adults have “morning brains.” They not only perform better on demanding cognitive tasks but also activate the same brain networks responsible for paying attention and suppressing distraction as younger adults, according to Canadian researchers.

The study, published online ahead of print publication in the journal Psychology and Aging, may have yielded some of the strongest evidence yet that there are noticeable differences in brain function across the day for older adults.

"Time of day really does matter when testing older adults. This age group is more focused and better able to ignore distraction in the morning than in the afternoon," said lead author John Anderson, a PhD candidate with the Rotman Research Institute at Baycrest Health Sciences and University of Toronto, Department of Psychology.

"Their improved cognitive performance in the morning correlated with greater activation of the brain's attentional control regions – the rostral prefrontal and superior parietal cortex – similar to that of younger adults."

 

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Anderson recommended that seniors try to schedule their most mentally-challenging tasks for the morning time. Those tasks could include doing taxes, taking a test (such as a driver's license renewal), seeing a doctor about a new condition, or cooking an unfamiliar recipe.

In the study, 16 younger adults (aged 19 – 30) and 16 older adults (aged 60-82) participated in a series of memory tests during the afternoon from 1 – 5 p.m. The tests involved studying and recalling a series of picture and word combinations flashed on a computer screen.

Irrelevant words linked to certain pictures and irrelevant pictures linked to certain words also flashed on the screen as a distraction. During the testing, participants' brains were scanned with fMRI which allows researchers to detect with great precision which areas of the brain are activated.

Older adults were 10 percent more likely to pay attention to the distracting information than younger adults who were able to successfully focus and block this information. The data confirmed that older adults showed substantially less engagement of the attentional control areas of the brain compared to younger adults.

Indeed, older adults tested in the afternoon were "idling" – showing activations in the default mode (a set of regions that come online primarily when a person is resting or thinking about nothing in particular) indicating that perhaps they were having great difficulty focusing. When a person is fully engaged with focusing, resting state activations are suppressed.

When 18 senior adults were morning tested (8:30 a.m. – 10:30 a.m.) they performed noticeably better, according to two separate behavioral measures of inhibitory control. They attended to fewer distracting items than their peers tested at off-peak times of day, closing the age difference gap in performance with younger adults. Importantly, older adults tested in the morning activated the same brain areas young adults did to successfully ignore the distracting information.

This suggests that 'when' older adults are tested is important for both how they perform and what brain activity one should expect to see.

"Our research is consistent with previous science reports showing that at a time of day that matches circadian arousal patterns, older adults are able to resist distraction," said Dr. Lynn Hasher, senior author on the paper and a leading authority in attention and inhibitory functioning in younger and older adults.

The Baycrest findings offer a cautionary flag to those who study cognitive function in older adults. "Since older adults tend to be morning-type people, ignoring time of day when testing them on some tasks may create an inaccurate picture of age differences in brain function," said Dr. Hasher, senior scientist at Baycrest's Rotman Research Institute and Professor of Psychology at University of Toronto.

The Baycrest study was funded by the Canadian Institutes for Health Research, and the Natural Sciences and Engineering Research Council.

Baycrest Centre for Geriatric Care

 

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