Abstract
Two experiments investigated temporal integration of double electrical pulses. In Experiment 1, absolute thresholds for double pulses with interstimulus intervals (ISIs) of 0 to 10 msec were determined under three member-pulse durations. In Experiment 2, magnitude estimates for double pulses with ISIs of 0 to 400 msec were obtained at six painful suprathreshold levels. The results, taken together, indicate that (1) partial or no integration takes place at the threshold level, but additive or superadditive integration occurs at the suprathreshold level, and (2) the temporal limit on the integration of double pulses may be longer at the suprathreshold level than at the threshold level, and (3) double pulses at the suprathreshold levels are perceived as most intense for the ISI of about 7 msec.
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