Infraslow Rhythmic Potential Oscillations In The Cerebral Cortex

By "infraslow" (Aladjalova, 1956b, 1957) rhythmic oscillations we mean the rhythmic potential oscillations that are sinusoidal in appearance (Fig. 7) with a frequency of 7-8 osc/min and an amplitude of 0.3-0.8 mV (A*-rhythm) and with a frequency of 0.5-2 osc/min and an amplitude of 0.5-1.5 mV (B*-rhythm). Infraslow oscillations differ from the aperiodic

Fig. 7. Infraslow rhythmic changes in a recording from the motor cortex (electrodes 1-2, 5-6). (A) = A-rhythm; (B) = B-rhythm; (C) = combination of A- and B-rhythms. Recording made in different experiments without anesthesia. Bottom left: diagram of position of electrodes on the rabbit brain (cf.text).

Fig. 7. Infraslow rhythmic changes in a recording from the motor cortex (electrodes 1-2, 5-6). (A) = A-rhythm; (B) = B-rhythm; (C) = combination of A- and B-rhythms. Recording made in different experiments without anesthesia. Bottom left: diagram of position of electrodes on the rabbit brain (cf.text).

potential oscillations described in the preceding chapter in that they are rhythmic oscillations that may follow one after the other for several hours or days. An infraslow rhythm arises in another electrochemical system than the other changes in the potential of the brain. Although infraslow potentials arise independently of the more rapid electrical activity, there seems to be a connection between them {cf. Chapter IV).

Infraslow rhythmic potential oscillations are also characteristic of the human brain.

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