Discriminability of time-reversed click pairs: intensity effects

Abstract

The present investigation examined the effects of the interclick intensity ratio (ΔI) and signal level (I0) on discriminability of time-reversed click pairs. Discriminability was assessed for five normal-hearing listeners using a 2IFC procedure. The level of the more intense click (I0) was fixed at 75 or 45 dB SL. Four values of ΔI were employed such that within a click pair the more intense click exceeded the less intense click by 3, 6, 12, or 24 dB. Discriminability of the click pairs was evaluated at eight interclick intervals between 0.5 and 10.0 msec. Discriminability was altered systematically by changes in both I0 and ΔI. The interclick interval required for 75% correct discrimination ranged from less than 0.5 to 1.8 msec. The observed intensity effects suggest that discriminability of the time-reversed click pairs is predictable from temporal masking data. Subject Classification: 65.75, 65.58, 65.50.