Abstract
The effects of mesencephalic reticular formation (MRF) stimulation on cortical-evoked potentials was studied in nine cats. The interval between MRF stimulation and delivery of tonal stimuli (i.e., delay) was varied as was the intensity of electrical stimuli at 52 sites in MRF. The effects of MRF stimulation on auditory-evoked potentials were, as in the visual system, time dependent: with a 30 ms delay, the N1 wave (latency 10–15 ms) was usually augmented; with a 25 ms delay, the P2 wave (latency 20–25 ms) was consistently suppressed; with a 5 ms delay, the N2 wave (latency 35–50 ms) was consistently augmented. The most effective stimulation sites were sharply localized within MRF. Stimulation alone at these sites elicited large field potentials in auditory cortex with a peak latency of 30–50 ms and a duration of 80 ms. Stimulation of neighboring sites evoked only marginal changes even with increased current. Pupillary behavior, used as an experimental control, was affected by broader areas within the MRF. [Work supported by NIH.]
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