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Journal of Experimental Biology 85,323-332 (1980)
Published by Company of Biologists 1980

Binaural Interaction in the Cod

KATHLEEN HORNER ¹, OLAV SAND ², and PER S. ENGER ²

¹ Institute of Zoophysiology, University of Oslo and Department of Physiology, Veterinary College of Norway, Oslo, Norway; Marine Laboratory, Aberdeen, Scotland
² Institute of Zoophysiology, University of Oslo and Department of Physiology, Veterinary College of Norway, Oslo, Norway

1. Recordings were made from 93 single units in the acoustical lobes and the torus semicircularis of the cod during sound stimulation and anodal blocking of the posterior saccular nerves.

2. Most medullary sound responses were phase locked to the stimulus to some degree. The phase locking was less pronounced in the torus semicircularis, and sound stimulation sometimes caused clear inhibition of activity in this area. A large fraction of the units in both recording loci was insensitive to our sound stimuli, which acted mainly via the swimbladder.

3. Peripheral blocking caused decreased activity and inhibition of sound responses in the acoustic lobes, indicating excitatory ascending input to this region. Binaural interaction was found in 8 of 29 medullary units tested during both ipsi- and contralateral block.

4. Single-sided blocking experiments revealed both inhibitory and excitatory input to the torus semicircularis region. Binaural interaction was found in 3 of the 5 units tested during both ipsi- and contralateral block in this area.

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