Temporal-structure and interaural-timing sensitivities rely on partially separate mechanisms

Evidence

The thresholds for the HUGGINS task showed a significant positive correlation with those for the TIME task (r = 0.50, p = 0.004), but not with those for the ITD task (r = 0.11, p = 0.553). This suggests that the performances of the TIME and HUGGINS tasks capture inter-individual variation of the efficiency of temporal-structure processing, but that of the ITD task is determined primarily by other factors. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1078

Categorization

• QUESTION: If ITD and temporal-structure processing share mechanisms, why don’t they correlate? What factor dominates ITD individual differences?