Slow evoked cortical potentials and temporal features of stimulation

摘要: Abstract Slow cortical responses were evoked from human subjects by either shocks or clicks. Electrodes at the vertex and right mastoid region. Various temporal features of stimulation explored, such as regularity stimulus intervals, duration these background rate effect prolonged exposure to stimulation. In general, amplitude response (N1−P2) is considerably increased lengthening intervals between stimuli. The last interval most important but mean interval, over prior 10 sec, also significant. “recovery process” for appears be faster than Irregularity per se gives only a slight enhancement. Our detailed conclusions follow. 1. Introduction irregularity into stimuli (with held constant 4 sec) slightly enhanced 2. Decreasing (for shocks), regardless whether regularly irregularly spaced, caused increase amplitude. Completely recovery occurred when less frequent sec. length before shock had strong on 3. With preceding interest 2.5 decrease in over-all clicks 8 2 sec responses. 4. Prolonged many minutes systematic decline shocks, no noticeable 5. Individual exceptions appeared all general statements, sometimes erratically, associated with particular subjects.