Aplysia gill and siphon withdrawal reflex
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The Aplysia gill and siphon withdrawal reflex (GSWR) is an involuntary, defensive reflex of the sea slug Aplysia that causes its delicate siphon and gill to be retracted when the animal is disturbed. The reflex is mediated by a siphon LE mechanosensory neuron and a gill or siphon motor neuron (L7 or LFS).
It is valuable in neuroscience since it can undergo a variety of learning regimens, including habituation, sensitization, and conditioning, despite the simplicity of the underlying neural circuitry.