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Evidence of Sleep Cycle Analogous to Vertebrate SWS/REM Alternation in the Octopus

41 Pages Posted: 22 Jul 2020 Publication Status: Published

See all articles by Sylvia Lima de Souza Medeiros

Sylvia Lima de Souza Medeiros

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Mizziara Marlen Matias de Paiva

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Paulo H. Lopes

Universidade Federal do Rio Grande do Norte (UFRN) - Department of Computer Science

Wilfredo Blanco

Universidade Federal do Rio Grande do Norte (UFRN) - Department of Computer Science

Françoise Dantas de Lima

Universidade Federal de Santa Catarina (UFSC) - Department of Ecology and Zoology

Jaime Bruno Cirne de Oliveira

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Inácio Gomes Medeiros

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Eduardo Bouth Sequerra

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Sandro de Souza

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

Tatiana Silva Leite

Universidade Federal de Santa Catarina (UFSC) - Department of Ecology and Zoology

Sidarta G. Ribeiro

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute

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Abstract

The combination of body quiescence and skin pattern changes displayed periodically by Sepia officinalis, as well as the high threshold for arousal upon stimulation and increased brain activity in quiescent Octopus vulgaris, suggest the existence of a state akin to rapid-eye-movement sleep (REM) in cephalopods. Would be possible that cephalopods, as amniotes, sleep through the alternation of distinct quiescent states, analogous to slow-wave sleep (SWS) and REM? To investigate this possibility, we video-recorded 4 adult specimens of Octopus insularis and quantified in detail their behavioral states and transitions. We also performed sensory stimulation to measure reaction times across all behavioral states. Two distinct quiescent states occurred in tandem, both quite unresponsive to stimulation (median reaction time: 50 s). The first state was SWS-like, characterized by uniformly pale skin, closed pupils, and long episode durations (median 415.2 s). The second state was REM-like, characterized by dynamic skin patterns, rapid eye movements and short episode durations (median 40.8 s). The REM-like state was periodic (60% of all recurrences between 26.85-39.15 min) and occurred mostly after the SWS-like state (82% of all transitions). These observations support the existence in cephalopods of an ultradian sleep cycle analogous to the SWS/REM alternation.

Suggested Citation

Medeiros, Sylvia Lima de Souza and de Paiva, Mizziara Marlen Matias and Lopes, Paulo H. and Blanco, Wilfredo and de Lima, Françoise Dantas and de Oliveira, Jaime Bruno Cirne and Medeiros, Inácio Gomes and Sequerra, Eduardo Bouth and de Souza, Sandro and Leite, Tatiana Silva and Ribeiro, Sidarta G., Evidence of Sleep Cycle Analogous to Vertebrate SWS/REM Alternation in the Octopus. Available at SSRN: https://ssrn.com/abstract=3640822 or http://dx.doi.org/10.2139/ssrn.3640822
This version of the paper has not been formally peer reviewed.

Sylvia Lima de Souza Medeiros

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Mizziara Marlen Matias De Paiva

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Paulo H. Lopes

Universidade Federal do Rio Grande do Norte (UFRN) - Department of Computer Science ( email )

PO Box 1524
Natal-RN, 59078970
Brazil

Wilfredo Blanco

Universidade Federal do Rio Grande do Norte (UFRN) - Department of Computer Science ( email )

PO Box 1524
Natal-RN, 59078970
Brazil

Françoise Dantas De Lima

Universidade Federal de Santa Catarina (UFSC) - Department of Ecology and Zoology ( email )

Campus Reitor João David Ferreira Lima
Bairro Trindade
Florianopolis, Santa Catarina 88040
Brazil

Jaime Bruno Cirne De Oliveira

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Inácio Gomes Medeiros

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Eduardo Bouth Sequerra

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Sandro De Souza

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

Tatiana Silva Leite

Universidade Federal de Santa Catarina (UFSC) - Department of Ecology and Zoology ( email )

Campus Reitor João David Ferreira Lima
Bairro Trindade
Florianopolis, Santa Catarina 88040
Brazil

Sidarta G. Ribeiro (Contact Author)

Universidade Federal do Rio Grande do Norte (UFRN) - Brain Institute ( email )

Natal
Brazil

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