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The effect of monocular deprivation on unihemispheric sleep in light and dark incubated/reared domestic chicks.
Laterality 2018 March
Unihemispheric sleep is an aspect of the cerebral lateralization of certain species of birds. During sleep, domestic chicks (Gallus gallus) show brief periods of monocular-unihemispheric sleep (Mo-Un sleep): one eye is open and the connected hemisphere is awaken while the other eye remains shut and the connected hemisphere sleeps. The time spent in Mo-Un sleep was investigated following a brief monocular deprivation (MD) in chicks hatched from eggs incubated in darkness and reared in light (D-L), incubated in light and reared in light (L-L) and incubated in darkness and reared in darkness (D-D). The right eye occluded for 12 h in half of chicks and the left eye in the other half. At the end of MD, the Mo-Un sleep was recorded. The effect of MD (total time and time bias) prevailed in determining the pattern of Mo-Un sleep. Chicks showed more time sleeping with the eye/hemisphere that was in control of visual behaviour during MD and opened more time the eye and awake the hemisphere visually deprived. The Mo-Un pattern was not influenced by incubation, rearing, symmetry/asymmetry of visual pathways and imprinting thereby indicating that Mo-Un sleep pattern depends only on the kind of visual experience during wakefulness.
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