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  • Title: [Relation between the dynamics of the extinction process and the initial rate of hypothalamic self-stimulation in the rabbit].
    Author: Belyĭ VP, Likhacheva LV.
    Journal: Zh Vyssh Nerv Deiat Im I P Pavlova; 1986; 36(4):665-70. PubMed ID: 3765832.
    Abstract:
    In experiments on rabbits with electrodes chronically implanted in the lateral hypothalamus, dynamics was studied of extinction of self-stimulation reaction as a result of cancellation of intracerebral reinforcement. General dynamics of extinction of the unreinforced instrumental actions and behavioural manifestations of orienting-investigating reaction were revealed. It was found, that in 30% of rabbits, the orienting reaction appearing as a result of "discordance" between expected and actual afferentation is attended by a species-specific form of behaviour, expressed in the form of hind paws synergic strokes against the floor. It is suggested that these strokes may be a somatic expression of a negative emotional state of animals during self-stimulation extinction. The comparison of extinction dynamics with the level of self-stimulation background frequency showed a relative independence of the strength of drive towards getting positive emotions on motivational effects created by electric stimulation of the reinforcing brain structures.
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