Effects of dynamic pitch manipulation methods on speech perception in noise by older listeners with hearing loss

Abstract

Dynamic pitch, as defined by the variation in fundamental frequency (f0) of speech, is a major acoustic cue in speech perception. While dynamic pitch manipulation negatively affects speech perception in noise on a group level, there is substantial variability across older listeners with hearing loss. The manipulation method used in previous studies, however, may distort pitch contours in natural speech. In this study, a new manipulation method is employed by exaggerating pitch contours above mean pitch. The primary purpose of the study is to compare the effects of these two manipulation methods on speech recognition in noise by older listeners with hearing loss. The secondary purpose is to examine the connection between individuals’ responses to dynamic pitch manipulation and intonation perception. Speech reception threshold in noise was measured from 8 older listeners (mean age 74.5 years) with mild-moderate sensorineural hearing loss. Intonation perception was measured by a 2-alternative discrimination paradigm. Data up to date suggest a stronger effect from the new method, with the weakened dynamic pitch being more beneficial than the original pitch contour. Further, individuals’ intonation perception is associated with their response to pitch manipulation. The theoretical and clinical implications will be discussed. [Word supported by NIH.]