聴覚系における時間加算特性

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Several experiments dealing with temporal summation characteristics in auditory systems were carried by means of jittered pulse trains, and the results are as follows:(1)The audible thresholds of the pulse trains were determined as a function of the pulse density. The results, as shown in Fig. 3, indicate that for repetition rates lower than 10pps there is little change in threshold, and that for the higher rates the threshold becomes lower with increasing repetition rate. The slopes of the threshold curves increase to -3dB/oct. for repetitions rate in the range of 125-250 pps. this characteristic is attributable to temporal integrations in the auditory system. Furthermore, this phenomenon was observed at at about 2 kpps, so it should be considered that there is a temporal summation function in the low stage of the auditory system. The time constant of integration, estimated from these data, is about 30 msec. (2)A similar phenomenon based on temporal summation was observed for the loudness of jittered pulse trains. That is, a pulse train with a higher pulse repetition rate is louder than one with a lower rate. Although this phenomenon is distinct for weak stimuli, it gradually disappears as the stimulating sound becomes more intense(Fig. 5). The mechanism causing these phenomenon is discussed by means of a firing model of the neuron bahased on neurophysilogical evidence and good agreement is obtained. (3)Related to the temporal loudness summation, the effect of loudness on the discrimination on duration was examined. The results are that the duration of sound is perceived based on loudness for durations shorter than 50 msec. but for longer durations no influence of loudness on the perception of durations was observed (Fig. 10, 11). This result was comformed by means of a sound with interaural time difference and light stimuli. That is, in order that the information about the loudness be excluded from the stimuli, interaural time differences and time difference of lighting were used as stimuli and both discriminations were determined. The results that discriminations becomes constant at about 10 msec. for time differences shorter than 50 msec. (Fig. 12, 13). By contract, the discrimination of duration becomes less with the decrease of duration(Fig. 11). these results show that the duration of sound is perceived through integration circuits with a time constant of about 30 msec.
社団法人日本音響学会の論文
1974-12-01

聴覚系における時間加算特性

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