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Dynamics of spatiotemporal organization of cortical potentials during extinction of an electrodefensive conditioned reflex in rabbits

Conclusions

  1. 1.

    During acute interrupted extinction of a short-delay electrodefensive conditioned avoidance reflex to flashes in rabbits three stages can be distinguished. In the initial stage a well-marked motor response is still present and is coupled with generalized synchronous waves of cortical potentials in the theta-rhythm, similar in shape and amplitude.

  2. 2.

    The second stage of formation of extinctive inhibition, when the probability of a motor response is higher than the probability of its appearance, is coupled with the formation of periodic inversion of the cortical potential gradient in the rhythm of the conditioned stimulus (4 Hz); the amplitude of the waves under these circumstances is greatest in the visual cortex.

  3. 3.

    In the late stage of extinction slower inversion of the cortical potential gradient is formed and this is often accompanied by the development of a drowsy state of the rabbit. The formation of periodic inversion of the cortical potential gradient was thus an essential condition for the formation of extinctive inhibition.

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Translated from Zhurnal Vysshei Nervnoi Deyatel'nosti, Vol. 30, No. 5, pp. 980–987, September–October, 1980.

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Kurova, N.S. Dynamics of spatiotemporal organization of cortical potentials during extinction of an electrodefensive conditioned reflex in rabbits. Neurosci Behav Physiol 13, 191–197 (1983). https://doi.org/10.1007/BF01148849

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Keywords

  • Late Stage
  • Conditioned Stimulus
  • Visual Cortex
  • Motor Response
  • Potential Gradient