Table 3.
Spearman's rho coefficients are shown for the relation between the FFR measures and threshold for each of the behavioral tasks. Conditions are labelled with the letter denoting frequency [(L)ow or (H)igh] and the numeric value indicating sound level (40 or 80 dB SPL, respectively). For the L40 and L80 conditions, correlations were with the 255-Hz pure-tone FFR. For the H40 and H80 conditions, correlations were with the envelope FFR for a 4000-Hz carrier amplitude modulated at 255 Hz. For the differential measures (H80-L80, and H80-H40), correlations were with the differential FFR measure (envelope FFR minus pure-tone FFR). In each case, the predicted relation between the FFR measure and performance is a negative one. Those with noise-induced synaptopathy are expected to have lower FFR scores and poorer (higher) psychophysical thresholds. * = p < 0.05; ** = p < 0.01 (uncorrected).
| Task (N) | Condition |
|||||
|---|---|---|---|---|---|---|
| L40 | L80 | H40 | H80 | H80 – L80 | H80 – H40 | |
| FDL (123) | −0.08 | 0.00 | −0.06 | 0.08 | −0.03 | 0.09 |
| IPD (123) | −0.12 | 0.05 | 0.04 | −0.06 | −0.15 | −0.13 |
| IDL (119) | −0.08 | −0.15 | −0.09 | 0.04 | −0.01 | 0.00 |
| AMD (119) | −0.19* | −0.06 | 0.04 | 0.15 | 0.12 | 0.11 |