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Effects of sleep deprivation on sleep in 5- and 8-day post-hatching domestic chicks

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The pattern of sleep was studied in chicks (Gallus gallus) following sleep deprivation (SD). Chicks of days 5 and 8 post-hatching were divided into three groups: non-deprived (N-SD), deprived 4 h (SD-4H) and deprived 8 h (SD-8H). Binocular (Bin-sleep) and monocular sleep (Mo-Un sleep) were recorded for 6 h after SD which was performed by enforced locomotion. Bin-sleep was higher in sleep-deprived than non-deprived chicks and was higher after 8 h than after 4 h of SD. In 5-day-old chicks, time spent in Mo-Un sleep during recovery did not change after 4 h; rather, it decreased after 8 h of SD. In 8-day-old chicks, after 4 h SD there was an increase of time spent in Mo-Un sleep whilst 8 h SD caused no effect. N-SD chicks of day 5 showed more right Mo-Un sleep whilst in 8-day chicks there was more left Mo-Un sleep. On the other hand, no significant bias for the time spent in right or left Mo-Un sleep was observed in sleep-deprived chicks. In conclusion, the rebound effect during recovery appears to be equally distributed in both hemispheres and the suggested role of Mo-Un sleep in vigilance and in the control of environment equally shared by both hemispheres.

Affiliations: 1: Department of General Psychology, University of Padova, via Venezia 8, 35131 Padova, Italy

10.1163/156853909X421296
/content/journals/10.1163/156853909x421296
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/content/journals/10.1163/156853909x421296
2009-09-01
2016-12-04

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