Figure 8.

(Color online) Acoustic and neural correlates of behavioral chordal sonority ratings. Presentation level was 70 dB SPL. Neural pitch salience (A) derived from NH AN responses (squares) show close correspondence to perceptual ratings of chords reported for nonmusician listeners (Cook and Fujisawa, 2006; black circles). Salience values have been normalized with respect to the NH unison presented at 70 dB SPL. Similar to the dyad results, HI estimates for chords (triangles) indicate that the overall differences between triad qualities are muted with hearing loss. Roughness computed from AN (C) shows that only HI responses contain meaningful correlates of harmony perception; NH neural roughness does not predict the ordering of behavioral chordal ratings. In contrast, both acoustic periodicity (B) and roughness (D) provide correlates of chord perception and are inversely related; consonant triads contain larger degrees of periodicity and relatively less roughness than dissonant triads.