Some human cognitive functions may depend on seasonal

A new study found that certain human cognitive functions appear to depend on the season.

Emotion changes have been linked together with the seasonal, but people understand little about how other brain functions of human change depending on the seasonal. Christelle Meyer and his colleagues measured cognitive brain functions of 28 volunteers in different periods in a year. In each test phase, each subject were arranged in the absence of sunlight and other seasonal cues such as contact with the outside the laboratory for 4.5 days. Using functional magnetic resonance imaging to assess two separate tasks of sustained attention and executive functions in the higher 4.5 days of the end of the period, the researchers. Subjects in both task performance remains constant, but the brain resources to complete these two tasks with the seasons change. Sustained attention-related brain activity in the vicinity of the peak summer solstice in June, the lowest in the vicinity of the winter solstice. In contrast, working memory-related brain activity of these higher-level tasks in the autumn peak, lower in the vicinity of the spring equinox.

The researchers say that these results do not melatonin measurement data or other endocrine alertness and sleep neurophysiological measurements are correlated. In addition to the daily circadian rhythm, some brain functions may be more seasonal than previously expected and seasonal rhythm of these cognitive processes may have specificity.

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