End Point of Lateralization for Dichotic Clicks

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Abstract
The lag-click threshold (i.e., the end-point for lateralization of dichotically presented clicks) decreases with increase in sensation level (SL) of both clicks, by an interaural intensity asymmetry favoring the lag click, or by a decrease in the low-frequency components of both clicks. As the SL of binaural broad-band noise (125-8000 cps) is increased to 30 dB, the lag-click threshold decreases; but as the noise level is increased further, the lag-click threshold increases. The finding of a minimum point at 30 dB is related to the broad spectrum of the noise. A one-octave low-frequency band of noise presented either to both ears or to the ear receiving the lead click, decreases the lag-click threshold, while a one-octave high-frequency band of noise presented either to both ears or to the ear receiving the lead click increases the lag-click threshold.

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