Cyclic alternation of quiet and active sleep states in the octopus

• Autor(a) principal: Medeiros, Sylvia Lima de Souza
• Data de Publicação: 2021
• Outros Autores: Paiva, Mizziara Marlen Matias de, Lopes, Paulo Henrique, Blanco, Wilfredo, Lima, Françoise Dantas de, Oliveira, Jaime Bruno Cirne de, Medeiros, Inácio Gomes, Sequerra, Eduardo Bouth, Souza, Sandro José de, Leite, Tatiana Silva, Ribeiro, Sidarta Tollendal Gomes
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/32013
• topic: Splee state; Octopus insularis; Ethology; Zoology; Biological

Previous observations suggest the existence of ‘Active sleep’ in cephalopods. To investigate in detail the behavioral structure of cephalopod sleep, we video-recorded four adult specimens of Octopus insularis and quantified their distinct states and transitions. Changes in skin color and texture and movements of eyes and mantle were assessed using automated image processing tools, and arousal threshold was measured using sensory stimulation. Two distinct states unresponsive to stimulation occurred in tandem. The first was a ‘Quiet sleep’ state with uniformly pale skin, closed pupils, and long episode durations (median 415.2 s). The second was an ‘Active sleep’ state with dynamic skin patterns of color and texture, rapid eye movements, and short episode durations (median 40.8 s). ‘Active sleep’ was periodic (60% of recurrences between 26 and 39 min) and occurred mostly after ‘Quiet sleep’ (82% of transitions). These results suggest that cephalopods have an ultradian sleep cycle analogous to that of amniotes