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Orienting reflex and spectral characteristics of cortical biopotentials in rabbits

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Conclusions

  1. 1.

    In automated experiments bioelectrical indices of the orienting reflex to photic stimulation were investigated using computer analyses.

  2. 2.

    During the orienting reflex there was great similarity between EEG's recorded from motor and visual cortex, both before and during stimulation (cross-correlation coefficient (ρ ⩾ 0. 7). In the immediate prestimulus interval the values of the coherence function reached a high level (0.5–0.7) at all frequencies (0.5 to 22 Hz) particularly in the frequency band 4–6 Hz (∼0.9), where the phase angle as a rule was close to zero. During stimulation the value of the coherence function in the theta-band increased still further (∼1.0).

  3. 3.

    The spectra of biopotentials in both cortical areas show clearly defined peaks in the frequency bands 4–6 Hz during the time interval before stimulation. During presentation of the photic stimulus the spectral peak in this frequency band becomes clearly defined and is shifted by 0.5–2.5 Hz towards higher frequencies.

In the absence of an orienting reflex a great variety of configurations of the functions analyzed is observed and the relationship between the characteristics indicated in paragraphs 2 and 3 is different.

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Authors and Affiliations

  1. Institute of Higher Nervous Activity and Neurophysiology, USSR Academy of Sciences, Moscow

    V. D. Trush & T. M. Efremova

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  1. V. D. Trush
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  2. T. M. Efremova
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Trush, V.D., Efremova, T.M. Orienting reflex and spectral characteristics of cortical biopotentials in rabbits. Neurosci Behav Physiol 5, 347–354 (1972). https://doi.org/10.1007/BF01183109

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