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date: 15 April 2021

Abstract and Keywords

Nonassociative learning has been extensively studied in many invertebrate species for several decades. Habituation and sensitization are ubiquitously observed in different species, and observations of these behavioral plasticities have greatly contributed to the theoretical work to characterize nonassociative learning. Here, we review the rich body of literature in invertebrate nonassociative learning research. Investigations of the underpinnings of nonassociative learning in a variety of invertebrate species have demonstrated that conserved neural and molecular mechanisms are common despite the diversity of phylogeny. Nonassociative learning appears to be biologically essential and evolutionarily adaptive. Mechanisms of learning and memory uncovered in the studies of nonassociative learning in invertebrate species reviewed here have also been shown to be conserved in vertebrate systems and also play important roles in more complex forms of learning.

Keywords: nonassociative learning, habituation, sensitization, invertebrate, behavior, mechanism

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