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Dynamics of potentials evoked in the auditory pathway and reticular formation of the cat. Studies during waking and sleep stages

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Abstract

Averaged evoked potentials in the inferior colliculus (IC), medial geniculate nucleus (MG) and reticular formation (RF) of chronically implanted and freely moving cats were measured using auditory step functions in the form of tone bursts of 2000 Hz. The most prominent components of the AEP of the inferior colliculus were a positive wave of 13 msec and a negative wave of 40–55 msec latency. The AEP of the medial geniculate nucleus was characterized by a large negative wave peaking at 35–40 msec. During spindle sleep and slow wave sleep stages changes in the AEPs of both nuclei occured.

Transient evoked responses of the inferior colliculus, medial geniculate nucleus and reticular formation were transformed to the frequency domain using the Laplace transform (one sided Fourier transform) in order to obtain frequency characteristics of the systems under study. The amplitude characteristics of IC, MG. and RF obtained in this way revealed maxima in alpha (8–13 Hz), beta (18–35 Hz) and higher frequency (50–80 Hz) ranges. During spindle sleep stage a maximum in the theta frequency range (3–8 Hz) and during slow wave sleep maximum in the delta (1–3 Hz) frequency range appeared in the amplitude characteristics of these nuclei.

The amplitude characteristics of the inferior colliculus and medial geniculate nucleus were compared with the amplitude characteristics of other brain structures. The comparison of AEPs and amplitude frequency characteristics obtained using these AEPs reveals that the existence of a number of peaks (waves) with different latencies in the time course does not necessarily indicate the existence of different functional structures or neural groups giving rise to these waves. The entire time course of evoked potentials and not the number and latencies of the waves, carries, the whole information concerning different activities and frequency selectivities of brain structures.

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Authors and Affiliations

  1. Institute of Biophysics, Brain Research Laboratory, Hacettepe University, Ankara, Turkey

    Ç. Özesmi & E. Başar

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  1. Ç. Özesmi
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  2. E. Başar
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Supported by Turkish Scientific and Technical Research Council Grant TAG-266.

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Özesmi, Ç., Başar, E. Dynamics of potentials evoked in the auditory pathway and reticular formation of the cat. Studies during waking and sleep stages. Kybernetik 16, 27–35 (1974). https://doi.org/10.1007/BF00270292

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  • DOI: https://doi.org/10.1007/BF00270292

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