[Correlation between nonspecific and specific excitation in the cat somatosensory cortex during different modalities of stimulation].

Multiunit activity and EEG recorded with the same electrode from the somatosensory cortex in unrestrained cats, were compared. The obviously identical patterns of the EEG activation coincided with different multiunit patterns (acceleration or deceleration of frequency, modification of discharge order) depending on the stimulus modality (somatic, acoustic, direct RF stimulation) and on the foregoing background impulsation. This suggests that the EEG activation, although being basically unspecific, has specific features. The sensory information, apart from the known forms, seems to be coded in the form of diverse modes of functional activity of a neuronal population localized in a brain structure.