Este deja un lucru cunoscut că sunt foarte multi oameni extrem de sensibili la scăderea luminozității toamna și iarna si acest lucru determină uneori depresii sezoniere.
Totuși, cercetătorii au analizat și reacția cerebrală, prin rezonanță magnetică, și au constatat diferențe „uimitoare” în funcție de perioada anului în care s-au desfășurat testele.
Atenția a atins nivelul maxim în preajma solstițiului de vară (la jumătatea lunii iunie) și minim spre solstițiul de iarnă (jumătatea lunii decembrie).
Memoria a fost maximă în perioada echinocțiului de toamnă (jumătatea lunii septembrie) și minimă în cea a echinocțiului de primăvară (jumătatea lui martie).
Oamenii de știință belgieni au concluzionat că variațiile sezoniere influențează fiziologia cerebrală și implicit facultățile cognitive. Aceste fluctuații nu sunt resimțite în activitatea zilnică, însă, în cazul persoanelor sensibile, ele ar putea compromite controlul emoțional.
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