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Journal of Neuroscience, Vol 5, 1283-1292, Copyright © 1985 by Society for Neuroscience
Synaptic connectivity between cricket auditory interneurons as studied by selective photoinactivation
AI Selverston, HU Kleindienst and F Huber
Sound detection and localization are important for crickets. Interneurons
located in the prothoracic ganglion play a crucial role in the initial
processing of the auditory inputs. Two of the most readily recorded and
dye-marked auditory interneurons in the prothoracic ganglion of the cricket
are the omega cells (ON/1) and the ascenders (AN/2). By using a new
photoinactivation technique to selectively inactivate these cells, the
synaptic relationship between them could be studied. Our results indicate
that the ON/1 cells are connected to each other with reciprocal inhibitory
synapses. An ON/1 cell responds to contralateral stimulation with strong
inhibition mediated by the other ON/1 cell. When one cell is killed, this
inhibition is removed, and a weak excitatory response is unmasked. Unlike
the ON/1 cell, AN/2 produces an inhibitory response when stimulated
ipsilaterally to the cell body side, and this response is also removed when
the ipsilateral ON/1 cell is killed, providing strong evidence that ON/1 is
the source of the inhibition. As with the ON/1, the inhibition is replaced
by weak excitation.
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