Short-duration judgment in young Indian subjects under 30 h constant wakefulness.
The present study aimed to investigate probability of a possible endogenous circadian rhythm in human cognitive attribute to estimate short intervals. Apparently healthy young males and females were selected for our study. Eight subjects prospectively produced the short-time intervals 10 s and 60 s at 2 hourly intervals in 30 h constant routine (CR) study conducted in spring (CR-1). The study was repeated again in autumn (CR-2) in the remaining eight subjects. The established circadian markers, namely serum cortisol, salivary melatonin levels and tympanic temperature were also measured either in CR-1 or CR-2. Oral temperature was measured simultaneously. Circadian rhythms were validated in serum cortisol, salivary melatonin, oral, and tympanic temperatures. Circadian rhythm in 60 s estimates was observed in a few subjects and in all males at group level in CR-1. The cognitive attribute to perceive short intervals vary as function of season. The results provide evidence in support of interaction among the interval, circadian and circannual timing systems in human.
Babita
B
Pande
Arti
A
Parganiha
Pradeep Kumar
PK
Patra
Atanu Kumar
AK
Pati
D000328:Adult; D001831:Body Temperature; D002940:Circadian Rhythm / Q000502:physiology*; D003071:Cognition / Q000502:physiology; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D008550:Melatonin / Q000378:metabolism; D012463:Saliva / Q000378:metabolism; D012621:Seasons; D013998:Time Perception / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology*; D055815:Young Adult
D008550:Melatonin; D006854:Hydrocortisone