Ayres T J, Clack T D
J Acoust Soc Am. 1984 Aug;76(2):411-3. doi: 10.1121/1.391582.
Can a shift in interaural phase between a subthreshold signal and an audible contralateral probe tone affect perception of the probe? To obtain an answer, an 800-Hz tone was presented to both ears. The tone was presented continuously to one ear (-25 to + 10 dB SL) and in a sequence of four bursts per trial to the other ear (+ 10 dB SL). Interaural phase was reversed for either the second or the fourth burst in a 2 AFC task. Interaural phase-shift detection threshold (65% correct) varied with the intensity of the continuous signal; across subjects, this threshold varied from -21 to + 1 dB SL. When a 300-or 500-Hz masking tone was added to the ear with the continuous signal, phase-shift detection accuracy depended primarily upon the sensation level of the signal rather than its sound pressure level. These findings demonstrate temporal encoding at signal levels well below hearing threshold.
低于阈值的信号与可听的对侧探测音之间的耳间相位变化会影响对探测音的感知吗？为了找到答案，向双耳呈现了一个800赫兹的音调。该音调持续呈现给一只耳朵（-25至+10分贝感觉级），并在每次试验中以四个脉冲序列呈现给另一只耳朵（+10分贝感觉级）。在二项迫选任务中，耳间相位对于第二个或第四个脉冲被反转。耳间相位偏移检测阈值（65%正确）随连续信号的强度而变化；在不同受试者中，该阈值在-21至+1分贝感觉级之间变化。当一个300或500赫兹的掩蔽音被添加到有连续信号的耳朵时，相位偏移检测准确性主要取决于信号的感觉级而不是其声压级。这些发现证明了在远低于听力阈值的信号水平上的时间编码。
