Abstract:
:1. In Aplysia buccal ganglia, in which dual presynaptic neurons innervate multiple postsynaptic cells, strengths of the same identified synapses differ from animal to animal, consistent with developmental or plastic modulation. Synaptic strengths are specified by the postsynaptic neuron, so that synaptic current amplitudes are similar for inputs from different presynaptic cells converging on a postsynaptic cell but different for branches of the same neuron diverging onto different targets. 2. The coefficient of variation method of quantal analysis reveals that differences in synaptic strength, although specified postsynaptically, result partially from differences in the number of quanta released by presynaptic terminals. 3. This quantization is consistent with classical presynaptic models and suggests retrograde modulation of quantal release as postulated for hippocampal long-term potentiation.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Gardner Ddoi
10.1152/jn.1991.66.6.2150subject
Has Abstractpub_date
1991-12-01 00:00:00pages
2150-4issue
6eissn
0022-3077issn
1522-1598journal_volume
66pub_type
杂志文章abstract::1. The purpose of this study is to analyze the kinematics of stepping from the point of view of limb control by attempting to dissociate the various neuronal and mechanical factors that shape actual movements observed experimentally. The cat hindlimb, like the primate arm, is a multijointed mechanical system with redu...
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