Quercia Angelica, Bobbo Daniela, Mascetti Gian Gastone
a Department of General Psychology , University of Padova , Padova , Italy.
Laterality. 2018 Mar;23(2):166-183. doi: 10.1080/1357650X.2017.1347180. Epub 2017 Jul 2.
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.
单侧脑睡眠是某些鸟类大脑侧化的一个方面。在睡眠期间，家鸡（原鸡）会表现出短暂的单眼单侧脑睡眠（Mo-Un睡眠）：一只眼睛睁开，与之相连的半球处于觉醒状态，而另一只眼睛保持闭合，与之相连的半球处于睡眠状态。在经过短暂单眼剥夺（MD）后，对在黑暗中孵化并在光照下饲养（D-L）、在光照下孵化并在光照下饲养（L-L）以及在黑暗中孵化并在黑暗中饲养（D-D）的雏鸡的Mo-Un睡眠时间进行了研究。一半雏鸡的右眼被遮挡12小时，另一半雏鸡的左眼被遮挡。在MD结束时，记录Mo-Un睡眠情况。MD（总时间和时间偏差）在决定Mo-Un睡眠模式方面起主导作用。雏鸡在MD期间更多地使用控制视觉行为的眼睛/半球睡眠，并且更多地睁开视觉剥夺的眼睛并唤醒与之相连的半球。Mo-Un模式不受孵化、饲养、视觉通路的对称/不对称以及印记的影响，这表明Mo-Un睡眠模式仅取决于清醒期间的视觉体验类型。
