Signal transformation with pairing of sensory stimuli.

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Abstract
Rotation of the isolated nervous system of Hermissenda in a caudal orientation causes a synaptic hyperpolarization accompanied by elimination of impulse activity during the steady-state phase of type A but not type B photoreceptor responses to light. Rotation of the isolated nervous system in a cephalic orientation causes a synaptic depolarization with increase of impulse activity during the steady-state phase of both type A and type B photoreceptor responses to light. These effects of rotation on photoreceptors are explained by known synaptic interactions. Sufficient redundancy is provided by the neural organization of the visual system and its interaction with the statocyst to preserve much of the visual information in spite of signal transformation in specific photoreceptors resulting from pairing of rotation with light.

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