Monocular sleep in male domestic chicks

Mascetti, Gian Gastone; Bobbo, Daniela; Rugger, Marina; Vallortígara, Giorgio

doi:10.1016/j.bbr.2003.12.022

Cited by 12 publications

(2 citation statements)

References 28 publications

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“…The apparatus used for chick rearing and sleep recording has been described elsewhere (Bobbo et al 2002(Bobbo et al , 2006Mascetti et al 1999Mascetti et al , 2004aNelini et al 2010). BrieXy, it consisted of two glass home-cages (30 £ 40 £ 40 cm) with semi-transparent cloths along the wall serving as one-way screen (Fig.…”

Section: Apparatusmentioning

confidence: 99%

Monocular learning of a spatial task enhances sleep in the right hemisphere of domestic chicks (Gallus gallus)

2012

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Unihemispheric sleep is an aspect of cerebral lateralization of birds. During sleep, domestic chicks show brief periods during which one eye is open whilst the other remains shut. In this study, time spent in sleeping and in monocular-unihemispheric sleep (Mo-Un sleep) was investigated following the monocular learning of a spatial discrimination task. Two groups of experimental chicks from day 8 to day 11 post-hatching were trained in a spatial paradigm based on geometrical and topographical clues. One group performed the task with left eye open (LE-chicks), whilst another group performed the task with the right eye open (RE-chicks). LE-chick learned the task, whilst RE-chicks were unable to learn. Time spent in binocular sleep and right Mo-Un sleep (right eye closed and left hemisphere sleeping) was equal in both groups of chicks. Time spent in left Mo-Un sleep (left eye closed and right hemisphere sleeping) was significantly higher in LE-chicks than in RE-chicks. Laterality index reveals that LE-chicks had a significant bias towards more left Mo-Un sleep at any recording day, whilst RE-chicks showed a significant bias towards more right Mo-Un sleep at day 8 and 9 but not at days 10 and 11. RE-chick bias at days 8 and 9 could be attributed to a recovery process in left hemisphere connected to its activation/use effect during trials whilst recovery would be absent at days 10 and 11. LE-chicks bias would be associated with the formation of a spatial memory trace and with a recovery process in right hemisphere.

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Section: Apparatusmentioning

confidence: 99%

Monocular learning of a spatial task enhances sleep in the right hemisphere of domestic chicks (Gallus gallus)

2012

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“…Moreover, work by Boerema et al [ 67 ], using behavioural observations, found that laying hens deprived of sleep exhibited a decrease in monocular (i.e., uni-hemispheric) sleep in favour of binocular sleep. While a fair number of studies have looked at sleep behaviour in juvenile birds (e.g., [ 42 , 68 , 69 , 70 ]), the great discrepancy in sleep requirements and behaviour between juvenile and adult birds renders comparisons inappropriate.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Mild Disturbances on Sleep Behaviour in Laying Hens

Putyora

Brocklehurst

Tuyttens

et al. 2023

Animals

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The positive welfare of commercial animals presents many benefits, making the accurate assessment of welfare important. Assessments frequently use behaviour to determine welfare state; however, nighttime behaviours are often ignored. Sleep behaviour may offer new insights into welfare assessments. This study aimed to establish a baseline for sleep behaviour in laying hens and to then apply mild short-term disturbances and observe the subsequent effects. Twelve laying hens were divided into four batches and were surgically implanted with electroencephalogram (EEG) devices to record their brain activity. The batches were subjected to undisturbed, disturbed and recovery types of nights. Disturbed nights consisted of systematic sequences of disturbance application (wind, 90 dB noise or 20 lux light) applied one at a time for 5 min every 30 min from 21:00 to 03:00 (lights off period: 19:00–05:00). Sleep state was scored using EEG data and behaviour data from infrared cameras. Over all the types of night hens engaged in both SWS (58%) and REM sleep (18%) during lights off. When applied, the disturbances were effective at altering the amounts of wakefulness and SWS (Time × Type of Night, p < 0.001, p = 0.017, respectively), whereas REM sleep was unaltered (p = 0.540). There was no evidence of carry-over effects over the following day or night. Laying hens may be resilient to short-term sleep disruption by compensating for this in the same night, suggesting that these disturbances do not impact their long-term welfare (i.e., over days). Sleep behaviour potentially offers a unique means of assessing an aspect of animal welfare that, to date, has been poorly studied.

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Monocular-unihemispheric sleep and visual discrimination learning in the domestic chick

et al. 2006

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During sleep, domestic chicks (Gallus gallus) show brief and transient periods during which one eye is open while the other remains shut. Electrophysiological recordings showed that the hemisphere contra-lateral to the open eye exhibited an EEG with fast waves typical of wakefulness, whereas the hemisphere contra-lateral to the closed eye exhibited an EEG typical of slow wave sleep. We investigated the pattern of monocular-unihemispheric sleep (Mo-Un sleep; i.e. selective preferential closure/opening of the left or right eye during sleep) following three types of visual learning tasks. The first group of chicks was submitted to a colour discrimination task (1), the second group to a spatial discrimination task with colour as a conspicuous, but irrelevant, cue (2), the third group to a spatial task without colour cue. After learning, the amount of binocular sleep and Mo-Un sleep patterns were recorded. The first and the second group of chicks exhibited more right Mo-Un sleep (right eye-closure/left unihemispheric sleep), suggesting that this pattern may be connected with prevalent engagement of left hemisphere during training trials. The third group showed a significant more left Mo-Un sleep (left eye-closure/right unihemispheric sleep) which would be associated with a prevalent engagement of right hemisphere during trials. Chicks of the control groups, did not learn the task, but were submitted to an equal number of trials. Controls of tasks 1 and 2 showed more left Mo-Un sleep suggesting a dominance of right hemisphere during exposure trials. Instead there was no eye-closure bias in controls of task 3, suggesting an absence of hemispheric dominance during trials. It is suggested that the Mo-Un sleep pattern may be a type of local sleep associated with a process of functional recovery in the hemisphere which was mainly engaged during training trials.

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Monocular sleep in male domestic chicks

Cited by 12 publications

References 28 publications

Monocular learning of a spatial task enhances sleep in the right hemisphere of domestic chicks (Gallus gallus)

Monocular learning of a spatial task enhances sleep in the right hemisphere of domestic chicks (Gallus gallus)

The Effects of Mild Disturbances on Sleep Behaviour in Laying Hens

Monocular-unihemispheric sleep and visual discrimination learning in the domestic chick

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