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ITD discrimination thresholds from reference points chosen to minimize threshold (best reference). The average best reference for tone and noise was used where these differed. (A) Tone (open symbols) and noise (filled) thresholds as a function of characteristic frequency. Upright triangles: peak units; inverted triangles: trough units. (B) Direct comparison of tone and noise best thresholds for the same units. Upright triangles: peak units; inverted triangles: trough units.
