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Mean IC difference (ΔIC) thresholds as a function of reference IC for older (filled) and younger (open) participants at global interaural time differences of −312 (left triangle), 0 (circle) and +312 (right triangle) μs. The dashed line is average data from Pollack and Trittipoe (1959). Error bars show ±1 standard error. IC discrimination was significantly worse for older participants across reference ICs. There were no significant differences between ITDs for either age group.
