LAMINAR MICROELECTRODE ANALYSIS OF CORTICAL UNSPECIFIC RECRUITING RESPONSES AND SPONTANEOUS RHYTHMS

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Abstract
Cortical recruiting responses to repetitive stimulation of the unspecific thalamocortical projection system were analyzed throughout measured depths in cat''s cortex by means of microelectrodes. The experiments suggest a widespread distribution of unspecific afferent terminals probably with greater density in layers III and V. The surface-negative wave may represent a wave of dendritic depolarization following activation of cortical cells. This wave may also represent depolarization of cell membrane. The experiments also suggest that the recruiting wave may have a regulatory action on activity of certain cortical neurones.

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