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Journal of Neuroscience, Vol 14, 1245-1250, Copyright © 1994 by Society for Neuroscience
Enhancement of type B and A photoreceptor inhibitory synaptic connections in conditioned Hermissenda
RJ Frysztak and T Crow
Department of Neurobiology and Anatomy, University of Texas Medical School, Houston 77225.
Intrinsic changes have been identified in isolated and intact type A and
type B photoreceptors following classical conditioning of the nudibranch
mollusk Hermissenda. Aspects of various intrinsic, nonsynaptic
modifications are expressed by alterations in the excitability of
identified photoreceptors in response to the conditioned stimulus. In
addition to changes in cellular excitability, changes in synaptic strength
between identified neurons have been proposed as a possible mechanism of
associative learning in several invertebrate preparations. Here we report
that classical conditioning produces differential effects upon the strength
of inhibitory monosynaptic connections between identified pairs of type B
and type A photoreceptors. The amplitude of IPSPs elicited by an action
potential in the medial type B photoreceptor and recorded from medical type
A photoreceptors was significantly enhanced in conditioned animals as
compared to pseudorandom controls. In contrast, the amplitude of IPSPs
elicited by an action potential in the lateral type B photoreceptor and
recorded from lateral type A photoreceptors did not show significant
synaptic enhancement following conditioning. These results provide
additional evidence for differential effects of conditioning upon cellular
modifications in identified type A and type B photoreceptors, and further
indicate that multiple sites of cellular plasticity exist in the visual
system of conditioned Hermissenda.
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