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Positive synaptic feedback in visual system of nudibranch mollusk Hermissenda crassicornis

Positive synaptic feedback in visual system of nudibranch mollusk Hermissenda crassicornis AND DANIEL L. ALKON of Health, Section on Neural Marine Biological Systems, Laboratory of Biophysics, National Institutes Laboratory, Woods Hole, Massachusetts 02543 SUMMARY AND CONCLUSIONS 1. Intracellular recordings from pre- and post neurons were made to determine detailed neural organization within the visual system of adult specimens of the nudibranch mollusk Hermissenda crassicornis. 2. Excitatory post potentials (EPSPs) were recorded from the three type B photoreceptors in each eye. The frequency of these EPSPs varied as a function of temperature, dark adaption, and the preceding frequency of type B impulses elicted by light or positive currents. Type B impulses, presumably by an anode-break mechanism, thus controlled to some degree a direct positive onto itself. 3. Positive following a type B impulse train was also demonstrated to involve identified ipsilateral hair cells of the statocyst organ. 4. The same excitatory effect, i.e., increased frequency of EPSPs received by type B cells, was also found to follow impulse trains of specific ipsilateral hair cells. 5. Pre control of EPSP frequency was effected by current injection in another optic ganglion cell, the silent or S-cell. 6. This positive onto the type B photoreceptor contributes significantly to the animal’s ability to encode http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Positive synaptic feedback in visual system of nudibranch mollusk Hermissenda crassicornis

M. Tabata and D. L. Alkon
Journal of Neurophysiology , Volume 48: 174 – Jul 1, 1982
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Publisher
The American Physiological Society
Copyright
Copyright © 1982 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
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Abstract

AND DANIEL L. ALKON of Health, Section on Neural Marine Biological Systems, Laboratory of Biophysics, National Institutes Laboratory, Woods Hole, Massachusetts 02543 SUMMARY AND CONCLUSIONS 1. Intracellular recordings from pre- and post neurons were made to determine detailed neural organization within the visual system of adult specimens of the nudibranch mollusk Hermissenda crassicornis. 2. Excitatory post potentials (EPSPs) were recorded from the three type B photoreceptors in each eye. The frequency of these EPSPs varied as a function of temperature, dark adaption, and the preceding frequency of type B impulses elicted by light or positive currents. Type B impulses, presumably by an anode-break mechanism, thus controlled to some degree a direct positive onto itself. 3. Positive following a type B impulse train was also demonstrated to involve identified ipsilateral hair cells of the statocyst organ. 4. The same excitatory effect, i.e., increased frequency of EPSPs received by type B cells, was also found to follow impulse trains of specific ipsilateral hair cells. 5. Pre control of EPSP frequency was effected by current injection in another optic ganglion cell, the silent or S-cell. 6. This positive onto the type B photoreceptor contributes significantly to the animal’s ability to encode

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Jul 1, 1982

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