Experiments are reported on temporal summation at threshold for thermal noise. Durations from 1 to 850 msec and repetition rates from 1 to 100 per sec were used. Results show that threshold decreases as a function of duration for all repetition rates. Thresholds also decrease as a function of repetition rate, though the effect of repetition rate is not so marked as that of duration, and becomes even less so at long durations.

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