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Neural basis of wind receptive fields of cockroach periplaneta americana giant inter neurons


, : Neural basis of wind receptive fields of cockroach periplaneta americana giant inter neurons. Brain Research 238(1): 211-216

The pattern of connectivity between the 9 most prominent columns of sensory hairs of 1 cercus and ipsilateral giant interneurons (GI) 1 and 2 of the cockroach P. americana was studied using intracellular methods. GI 1, a somewhat directionally selective interneuron, receives excitatory synaptic input from all hair columns of the ipsilateral cercus, GI 2, an omini-directional cell, also receives excitatory synaptic input from all ipsilateral hair columns. For 2 of the 9 columns of hairs the response in GI 2 is greater than in GI 1. This difference in response magnitude represents a real difference in the functional strength of connection and not the number of synapsing afferents since the response in GI 1 and 2 declines stepwise as the number of hairs tested was reduced one by one. Thus, the difference in the shapes of the wind-receptive fields of GI 1 and 2 can be explained by differences in the functional strength of connection of certain identified afferents.

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