Have you ever noticed that and work in the winter is not always good, and you get tired faster, and the uptake is slower? It turns out, the fact is that time of year and the air temperature can affect the brain.
A study on this subject was published in the journal Proceedings of the National Academy of Sciences. Researchers from the University of Liège in Belgium, subjected to laboratory experiment, 28 healthy young test. In the room where they were placed in the four and a half days, we removed all the signs by which it was possible to determine the time of year, what time, as well as the subjects deprived of contact with the outside world. Also, the experiment participants were healthy sleep to study, and then went through cycles of sleep deprivation and recovery in the laboratory.
To do this, they chose 28 volunteers, which tested for brain activity subject during all seasons of the year. Every three months, each subject was placed in a special laboratory for four days, a person was denied access to the outside world. After this subject took place two test attention and purposeful activity. At this time the scanner measured the reading brain.
As it turned out, the test results are not dependent on the season. However, the activity of the brain, its resources, which he spent on the passage of the test, were different.
In terms of attention, the brain was the most active in the middle of summer, and the least - in the winter. The load on the short-term memory the most is in the fall, spring is almost no brain to expend effort for memory.
At the end of each trial period, attention and ability to purposeful activity was tested in the two tests, while brain activity was measured using functional magnetic resonance imaging. The test results are not dependent on the time of year, but the resources of the brain used for their passage, were different.
Brain activity associated with sustained attention, was the highest in June, near the summer solstice, and the minimum - at the winter solstice. On the contrary, the load associated with short-term memory, reached a peak in the fall and ultimately reduced to the day of the vernal equinox.
According to the study authors, these changes did not correlate with the hormonal rhythms (eg, melatonin), and with the degree of sleepiness during the different seasons.
Scientists insist that seasonal biorhythms need to learn along with daily.