PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “REFLEX, CONDITIONED”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

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

At least 19 recordsLinked to original sources
PubMedDate not supplied

[Dynamics of elaboration of conditioned reflex switching over of dissimilar instrumental conditioned reflexes].

Conditioned switching over of heterogeneous instrumental reactions was elaborated in four dogs. The action of a fan served as a switch from alimentary to a defensive situation. In the alimentary situation, the animal, in response to a conditioned stimulus, pressed the pedal with its right foreleg and, in a defensive situation, in response to the same signal, lifted the left paw attached to the lever. In some dogs the switching over was elaborated quite rapidly and easily, while in others it was achieved only on some days of the experiment. In the course of elaboration of the switching over, the animals responded to the trigger signal with bieffector reactions. The basic features of the dynamics of switching over elaboration revealed for classic conditioned reflexes also proved valid for instrumental conditioned reflexes.

Animals↗
PubMedDate not supplied

[The interaction of homogeneous motor conditioned reflexes during conditioned-reflex switchover: the transfer of learning and interference].

The dynamics of elaboration of the conditioned switchover (CSw) of homogeneous motor conditioned reflexes (CR) with different lateralization of the motor skill was studied in rabbits. Learning of CSw was shown to pass three basic stages characterized by different degree of consolidation of the CRs, by interaction between the two CRs, and by manifestation of CSw. Stages I and II reflected the process of afferent and efferent generalization of CRs and CSw, stage III was associated with specialization of CRs and CSw. Both positive and negative transfer of motor learning as well as interference between the two motor skills took place during CSw elaboration. The highest rate of CSw acquisition was observed in rabbits displaying positive motor transfer.

Animals↗
PubMed1991

[Inhibiting effect of the presentation of additional stimuli on neuronal responses in the cat sensorimotor cortex during a conditioned reflex].

Conditional responses of the sensomotor cortex neurons were registered in awake cats which were trained to respond to presentation of conditional stimuli (a single sound click) by instrumental conditional movement. Those neuronal responses were registered 50-150 ms before realization of reflex movements. During external stimulation after the reflex beginning, conditional neuronal reactions appeared 50-250 ms later, but the latencies of conditional movements did not change. It is supposed that the studied phenomenon is a result of the growing exteroceptive attention of cats to external stimulation.

Acoustic Stimulation↗
PubMedDate not supplied

[Effect of unilateral extirpation of the superior cervical sympathetic ganglion and electric stimulation of the posterior hypothalamus on the rate of reflex conditioning in the dog].

The influence of the sympathetic nervous system and the posterior hypothalamus on the rate of conditioning and the magnitude of conditioned reflexes was studied on dogs by motor defensive method. Extirpation of the superior cervical sympathetic ganglion reduced the conditioned reflex magnitude, delayed the elaboration of positive reflexes facilitating the formation of the inhibitory process. Stimulation of the posterior hypothalamus with electrical current of medium strength (50 mcA) promoted the enhancement of positive conditioned reflexes, and while not substantially affecting the rate of their formation, facilitated elaboration of internal inhibition.

Animals↗