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Perception et apprentissage prérinatal chez la seiche : approche comparative et effet du stress

Abstract : The focus of this thesis centres on the sensory, cognitive abilities and stress effect of two cuttlefish species: Sepia officinalis and Sepia pharaonis. First, we demonstrated that embryos respond to different environmental stimuli (i.e. light, prey, predators, ink) showing that sensory information passes through the egg capsule which allows a sensory transnatal continuity. Such responses to external stimuli are likely facilitated through their visual and chemosensory systems that are functional prior to hatching. We also demonstrated that the embryos of these two species are capable of simple learning (food imprinting) and associative learning (classical conditioning). These early abilities might increase their survival chance before and after hatching because they allow prey and predator recognition event before hatching. Finally, we showed that both natural embryonic stress (predatory odour) and artificial stress (light) have moderate or no effects on perinatal learning abilities. The same behavior was observed on the two species whereas they live in different continent. Taken together, these results demonstrate that cuttlefish embryos are not isolated from their environment, but rather detect and process external information which shapes their behaviors after hatching.
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Submitted on : Thursday, October 10, 2019 - 1:40:16 PM
Last modification on : Thursday, January 14, 2021 - 11:26:53 AM


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  • HAL Id : tel-02310693, version 1


Nawel Mezraï. Perception et apprentissage prérinatal chez la seiche : approche comparative et effet du stress. Psychologie et comportements. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC204⟩. ⟨tel-02310693⟩



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