Abstract
With repetitive stimulation of 2 sensory pathways which are intact within the isolated nervous system of Hermissenda [H. crassicornis], features of a cellular conditioning paradigm were identified. Type A, unlike type B photoreceptors, produce fewer impulses in response to light following temporally specific pairing of light stimuli with rotation stimuli. Type A photoreceptor impulse waveforms are specifically changed by such stimulus regimens. These findings can be explained, at least in part, by increased inhibition of type A cells by type B cells after stimulus pairing.

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