Jerald S. Cobbs

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1. Central neuronal mechanisms of siphon withdrawal in Aplysia were studied for the first time in intact, freely behaving animals by means of population recordings from implanted whole-nerve cuff electrodes. Intracellular follow-up studies were then conducted when the same animal was reduced to a semi-intact preparation. 2. Background spontaneous activity(More)
Two neurons with cell bodies symmetrically located in the abdominal ganglion and giant axons in the left (L1) and right (R1) pleurovisceral connectives of Aplysia californica were examined in vivo and in vitro. Direct stimulation of R1 and L1 in the intact animal does not elicit any observable behavior, suggesting that they are neither motoneurons nor(More)
The spontaneous discharge of the neurosecretory bag cells causes ovulation in the marine gastropod,Aplysia brasiliana, but the overt head movements that subsequently deposit the eggs on the substrate are initiated before the bag cells fire (see accompanying paper). Injection of homogenized abdominal ganglia (HAG) containing bag cells into intact animals(More)
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