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El patrón de la piel y la actividad neuronal durante el sueño del pulpo
Aditi Pophale1, Kazumichi Shimizu1, Tomoyuki Mano1
1Computational Neuroethology Unit, Okinawa Institute of Science and Technology (OIST) Graduate University, Okinawa, Japan.
Nature
|June 28, 2023
Resumen
Los pulpos exhiben dos etapas de sueño distintas, incluyendo una
Área de la Ciencia:
- La neurociencia
- Biología marina
- Conocimiento comparado
Sus antecedentes:
- Los vertebrados muestran al menos dos etapas de sueño: movimiento rápido de los ojos (REM) y sueño de ondas lentas (SWS).
- Los pulpos, invertebrados con cerebros complejos, desarrollaron inteligencia de forma independiente y comportamientos sofisticados.
- Comprender el sueño del pulpo proporciona información sobre la evolución del sueño y la cognición.
Objetivo del estudio:
- Identificar y caracterizar los correlatos neuronales y conductuales de dos etapas distintas del sueño en pulpos.
- Investigar la regulación homeostática y los umbrales de excitación asociados con las etapas de sueño del pulpo.
- Para comparar los patrones de sueño del pulpo con el sueño de los vertebrados para entender la evolución convergente.
Principales métodos:
- Observación del comportamiento del pulpo, incluidos los movimientos del cuerpo y el patrón de la piel durante el sueño.
- Análisis computacional de la dinámica del patrón de la piel durante el sueño activo.
- Registros electrofisiológicos de alta densidad de la actividad del potencial de campo local (LFP) en el cerebro central del pulpo.
Principales resultados:
- El sueño del pulpo incluye una etapa "quieta" y una etapa "activa" caracterizada por movimientos y cambios en el patrón de la piel.
- El sueño activo está regulado homeostáticamente, es rápidamente reversible y está asociado con un aumento de la excitación.
- La electrofisiología reveló una actividad de LFP similar a la vigilia en el cerebro central durante el sueño activo y oscilaciones similares al huso del sueño durante el sueño tranquilo.
Conclusiones:
- Las etapas del sueño del pulpo comparten similitudes con el REM y el SWS de los vertebrados, lo que sugiere una evolución convergente.
- El sueño activo en pulpos implica una actividad cerebral compleja en regiones asociadas con el aprendizaje y la memoria.
- Estos hallazgos indican que el sueño en dos etapas puede ser una característica convergente vinculada a la cognición compleja en especies distantes.
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