Thalamic center for the lateral line system in the catfishIctalurus nebulosus: Evoked potential evidence

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Abstract
Evoked potential methods were used to identify a lateral line center in the thalamus of the bullhead catfish [I. nebulosus]. The locus of this lateral line center corresponds to the mechanoreceptive thalamic zone and/or torothalamic tract identified by anatomical means. The thalamic lateral line area responds to acoustic stimuli and lateral line nerve shock but fails to respond to electroreceptor inputs that cause responses in their special part of the midbrain torus semicircularis. The latency of the 1st peak of response to lateral line nerve shock, which is also the main response peak, is 30 ms for the thalamic zone compared to 15 ms for the earliest peak response in the mechanoreceptive part of the torus semicircularis. The thalamic response fatigues much more quickly than the toral response and has different dynamic properties to closely spaced stimulus pairs.

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