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PLoS One. 2012;7(6):e38125. doi: 10.1371/journal.pone.0038125. Epub 2012 Jun 6.

A preliminary analysis of sleep-like states in the cuttlefish Sepia officinalis.

Author information

1
Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America. mgf@mail.med.upenn.edu

Abstract

Sleep has been observed in several invertebrate species, but its presence in marine invertebrates is relatively unexplored. Rapid-eye-movement (REM) sleep has only been observed in vertebrates. We investigated whether the cuttlefish Sepia officinalis displays sleep-like states. We find that cuttlefish exhibit frequent quiescent periods that are homeostatically regulated, satisfying two criteria for sleep. In addition, cuttlefish transiently display a quiescent state with rapid eye movements, changes in body coloration and twitching of the arms, that is possibly analogous to REM sleep. Our findings thus suggest that at least two different sleep-like states may exist in Sepia officinalis.

PMID:
22701609
PMCID:
PMC3368927
DOI:
10.1371/journal.pone.0038125
[Indexed for MEDLINE]
Free PMC Article

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