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Journal of Experimental Biology 59,675-696 (1973)
Published by Company of Biologists 1973

Visual and Multimodal Interneurones in the Ventral Nerve Cord of the Cockroach, Periplaneta Americana

R. J. COOTER ¹

¹ Queen Mary College, University of London; Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ

1. Visual and multimodal units were recorded from the thoracic nerve cord of the cockroach, Periplaneta americana, using glass microelectrodes.

2. Compound-eye units could be classified as ON-, OFF- or ON-OFF-units according to their response to visual stimulation. Some were multimodal, firing to both visual and tactile stimulation of the antennae.

3. Although some units were found to be either fired by ipsilateral or by contralateral stimulation only, others were fired by both types of stimulation, often in different ways.

4. Ocellar units were invariably OFF-units, mainly phasic, but one type showed tonic dark-firing in addition to the phasic OFF-burst.

5. The general properties of cockroach visual units are discussed and compared with those reported by other workers for different insects.