Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “CONDITIONED REFLEX”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,621 records · Page 90Linked to original sources
PubMedDate not supplied

[Effect of changes in extracellular calcium concentration on electrical characteristics of command neurons after defensive reflex conditioning in snail].

Studies of electrical characteristics of command neurons of the defensive reflex have shown that membrane potential does not reliable differ for both naive and learned snails with changing of the calcium concentrations in external solution. With increasing of the concentrations of calcium ions it is observed the increases of threshold potential from 14 + 0.7 mV in 2.5 mM Ca2+ to 21.8 + 0.9 mV in 20 mM Ca2+ for naive snails. Threshold potential decreases from 16.8 + 0.6 mV (saline solution for snail--10 mM Ca2+) to 13.3 + 0.6 mV in 20 mM Ca2+ with increasing of calcium concentrations for learned snails, and under its reduction it is also decreased, but less remarkably, than for naive, to 11.8 + 0.8 mV in 2.5 mM Ca2+. On the same scheme it is changed a critical level of depolarization: for naive snails it decreases with increasing of the calcium concentrations, and for learned snails it increases either with increasing of the calcium concentrations, and so with its reduction.

Animals↗
PubMed1983

[Reactions of the cat cortical field 7 during elaboration of a defensive conditioned reflex].

Neuronal activity of the parietal association cortex (field 7) was recorded in waking cats during and after defensive conditioning to sound. In 68% of neurons changes in impulse activity were observed with the appearance of first conditioned limb movements. The impulse responses of the neurons were stable only in the presence of conditioned limb movements; they disappeared during extinction of the reflex. In 46% of neurons the impulse activity appeared 50-450 ms before the conditioned movements of the limb. "Characteristic" impulse responses to paired stimuli preceded a quick flexion of the limb in response to electric skin stimulation.

Animals↗