Chick phasic bioelectric activity at the time of hatching and the effects of previous nialamide injection

Speciale, Samuel G.; Nowaczyk, T.; Jouvet, Michel

doi:10.1016/0006-8993(76)90996-3

Cited by 6 publications

(2 citation statements)

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“…The recording of the late pre-hatch embryo and newborn chick revealed a higher percentage of PS immediately after hatching (33% of total sleep) than for the same period 2 days after hatching (1 9%), supporting a recent study utilizing chicks implanted after hatching (Saucier & Astic, 1975). (A more complete quantitative description of the sleep-wakefulness pattern immediately after hatching and 2 days later is reported in Speciale, Nowaczyk, and Jouvet, 1976. )…”

Section: Kesii 1 T Ssupporting

confidence: 68%

A longitudinal study of bioelectric activity in the pre‐ and post‐hatch chick

Speciale¹,

Nowaczyk²,

Jouvet³

1976

Developmental Psychobiology

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A technique for embryonic implantation and the subsequent recording of electrocortical, neck muscle, and ocular activity continously from the 20th day of incubation through hatching and the first few days thereafter is demonstrated. The embryonic maturation of the EEG, with a characteristic muscle burst pattern heralding hatching was found, supporting previous reports obtained with acute preparations. The technique for injection into the chorioallantoic membrane (CAM) vessels or direct deposition onto the CAM is also described. The usefulness of the embryonic neurophysiological implantation coupled with the injection at specific stages of development is discusses as an approach to the understanding of the parameters of the maturation of the sleep-wakefulness cycle, neurochemistry, and behavior.

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Section: Kesii 1 T Ssupporting

confidence: 68%

A longitudinal study of bioelectric activity in the pre‐ and post‐hatch chick

Speciale¹,

Nowaczyk²,

Jouvet³

1976

Developmental Psychobiology

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“…While REM sleep can be first identified 1 – 2 d before chicken embryos hatch [38,39], age-related changes in REM sleep have been examined primarily following hatching. Several studies have reported that REM sleep as a % of total sleep time (%REM sleep) declines with age from higher amounts occurring shortly (0 – 8 h) after hatching [30,31,40,41]. However, others have reported lower %REM sleep in newly hatched chicks [33].…”

Section: Discussionmentioning

confidence: 99%

Linking melanism to brain development: expression of a melanism-related gene in barn owl feather follicles covaries with sleep ontogeny

et al. 2013

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BackgroundIntra-specific variation in melanocyte pigmentation, common in the animal kingdom, has caught the eye of naturalists and biologists for centuries. In vertebrates, dark, eumelanin pigmentation is often genetically determined and associated with various behavioral and physiological traits, suggesting that the genes involved in melanism have far reaching pleiotropic effects. The mechanisms linking these traits remain poorly understood, and the potential involvement of developmental processes occurring in the brain early in life has not been investigated. We examined the ontogeny of rapid eye movement (REM) sleep, a state involved in brain development, in a wild population of barn owls (Tyto alba) exhibiting inter-individual variation in melanism and covarying traits. In addition to sleep, we measured melanistic feather spots and the expression of a gene in the feather follicles implicated in melanism (PCSK2).ResultsAs in mammals, REM sleep declined with age across a period of brain development in owlets. In addition, inter-individual variation in REM sleep around this developmental trajectory was predicted by variation in PCSK2 expression in the feather follicles, with individuals expressing higher levels exhibiting a more precocial pattern characterized by less REM sleep. Finally, PCSK2 expression was positively correlated with feather spotting.ConclusionsWe demonstrate that the pace of brain development, as reflected in age-related changes in REM sleep, covaries with the peripheral activation of the melanocortin system. Given its role in brain development, variation in nestling REM sleep may lead to variation in adult brain organization, and thereby contribute to the behavioral and physiological differences observed between adults expressing different degrees of melanism.

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