Figure 5.

Threshold for contralateral versus ipsilateral ear input in squirrel monkeys with mild asymmetric hearing loss. A, C, E, The 6, 12, and 24 week recovery time periods. Threshold shift direction is almost exclusively to higher values (threshold shift up) at 6 and 12 weeks, an expected result from asymmetric injury to the auditory periphery. Threshold shift becomes inapparent by 24 weeks, an unexpected finding. B, D, F, Corresponding recovery time periods for the proportion of sites showing either threshold shift up or shift down. Data have been segmented to single octave bands referenced to the ipsilateral CF. The total proportion of sites showing interaural threshold difference is ∼45% for 6 and 12 weeks, but drops to <1% by 24 weeks. Sample size is in parentheses.