Short-duration judgment in young Indian subjects under 30 h constant wakefulness

• Published in: Indian journal of experimental biology Vol. 52; no. 5; p. 559
• Main Authors: Pande, Babita, Parganiha, Arti, Patra, Pradeep Kumar, Pati, Atanu Kumar
• Format: Journal Article
• Language: English
• Published: India 01.05.2014
• Subjects: Adult; Body Temperature; Circadian Rhythm - physiology; Cognition - physiology; Female; Humans; Hydrocortisone - blood; Male; Melatonin - metabolism; Saliva - metabolism; Seasons; Time Perception - physiology; Wakefulness - physiology; Young Adult
• ISSN: 0019-5189

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.