Phonological effects on the perceptual weighting of voice cues for voice gender categorization

Voice perception and speaker identification interact with linguistic processing. This study investigated whether lexicality and/or phonological effects alter the perceptual weighting of voice pitch (F0) and vocal-tract length (VTL) cues for perceived voice gender categorization. F0 and VTL of forward words and nonwords (for lexicality effect), and time-reversed nonwords (for phonological effect through phonetic alterations) were manipulated. Participants provided binary “man”/“woman” judgements of the different voice conditions. Cue weights for time-reversed nonwords were significantly lower than cue weights for both forward words and nonwords, but there was no significant difference between forward words and nonwords. Hence, voice cue utilization for voice gender judgements seems to be affected by phonological, rather than lexicality effects.</p

Differences in Processing Speech-on-Speech Between Musicians and Non-musicians: The Role of Prosodic Cues.

In the current study, we investigate the role of prosodic cues in speech-on-speech perception in musicians and non-musicians. Earlier studies have shown that musically experienced listeners may have an advantage in speech-on-speech performance in behavioral tasks (1,2). Previously, we have also shown in an eye-tracking study that musical experience has an effect on the timing of resolution of lexical competition when processing quiet vs masked speech (3). In particular, musicians were faster in lexical decision-making when a two-talker masker was added to target speech. However, the source of the difference observed between groups remained unclear. In the current study, by employing a visual world paradigm, we aim to clarify whether musicians make use of durational cues that contribute to prosodic boundaries in Dutch, in resolving lexical competition when processing quiet vs two-talker masked speech. If musical training preserves listeners' sensitivity to the acoustic correlates of prosodic boundaries when processing masked speech, we expect to observe more lexical competition and delayed lexical resolution in musicians. We will compare gaze-tracking and pupil data of both groups across conditions

Measure and model of vocal-tract length discrimination in cochlear implants

Voice discrimination is crucial to selectively listen to a particular talker in a crowded environment. In normalhearing listeners, it strongly relies on the perception of two dimensions: the fundamental frequency and the vocal-tract length. Yet, very little is known about the perception of the latter in cochlear implants. The present study reports discrimination thresholds for vocal-tract length in normal-hearing listeners and cochlear-implant users. The behavioral results were then used to determine the effective spectral resolution in a model of electric hearing: effective resolution in the implant was found to be poorer than previously suggested by psychophysical measurements. Such a model could be used for clinical purposes, or to facilitate the development of new strategies.</p

Early Deafened, Late Implanted Cochlear Implant Users Appreciate Music More Than and Identify Music as Well as Postlingual Users

Introduction: Typical cochlear implant (CI) users, namely postlingually deafened and implanted, report to not enjoy listening to music, and find it difficult to perceive music. Another group of CI users, the early-deafened (during language acquisition) and late-implanted (after a long period of auditory deprivation; EDLI), report a higher music appreciation, but is this related to a better music perception? Materials and Methods: Sixteen EDLI and fifteen postlingually deafened (control group) CI users participated in the study. The inclusion criteria for EDLI were: severe or profound hearing loss onset before the age of 6 years, implantation after the age of 16 years, and CI experience more than 1 year. Subjectively, music perception and appreciation was evaluated using the Dutch Musical Background Questionnaire. Behaviorally, music perception was measured with melodic contour identification (MCI), using two instruments (piano and organ), each tested with and without a masking contour. Semitone distance between successive tones of the target varied from 1 to 3 semitones. Results: Subjectively, the EDLI group reported to appreciate music more than postlingually deafened CI users. Behaviorally, while clinical phoneme recognition test score on average was lower in the EDLI group, melodic contour identification did not significantly differ between the two groups. There was, however, an effect of instrument and masker for both groups; the piano was the best-recognized instrument, and for both instruments, the masker with non-overlapping pitch was best recognized. Discussion: EDLI group reported higher appreciation of music than postlingual control group, even though behaviorally measured music perception did not differ significantly between the two groups. Both surprising findings since EDLI CI users would be expected to have lower outcomes based on the early deafness onset, long duration of auditory deprivation, and on average lower clinical speech scores. Perhaps, the music perception difficulty comes from similar electric hearing limitations in both groups. The higher subjective appreciation in EDLI might be due to the lack of a musical memory, with no ability to compare music heard via the CI to acoustic music perception. Overall, our findings support a benefit from implantation for a positive music experience in EDLI CI users

The relation between speaking-style categorization and speech recognition in adult cochlear implant users

The current study examined the relation between speaking-style categorization and speech recognition in post-lingually deafened adult cochlear implant users and normal-hearing listeners tested under 4- and 8-channel acoustic noise-vocoder cochlear implant simulations. Across all listeners, better speaking-style categorization of careful read and casual conversation speech was associated with more accurate recognition of speech across those same two speaking styles. Findings suggest that some cochlear implant users and normal-hearing listeners under cochlear implant simulation may benefit from stronger encoding of indexical information in speech, enabling both better categorization and recognition of speech produced in different speaking styles.</p

Are musicians at an advantage when processing speech on speech?

Several studies have shown that musicians may have an advantage in a variety of auditory tasks, including speech in noise perception. The current study explores whether musical training enhances understanding two-talker masked speech. By combining an off-line and an on-line measure of speech perception, we investigated how automatic processes can contribute to the potential perceptual advantage of musicians. Understanding the underlying mechanisms for how musical training may lead to a benefit in speech-in-noise perception could help clinicians in developing ways to use music as a means to improve speech processing of hearing impaired individuals

Talker variability in word recognition under cochlear implant simulation:Does talker gender matter?

Normal-hearing listeners are less accurate and slower to recognize words with trial-to-trial talker changes compared to a repeating talker. Cochlear implant (CI) users demonstrate poor discrimination of same-gender talkers and, to a lesser extent, different-gender talkers, which could affect word recognition. The effects of talker voice differences on word recognition were investigated using acoustic noise-vocoder simulations of CI hearing. Word recognition accuracy was lower for multiple female and male talkers, compared to multiple female talkers or a single talker. Results suggest that talker variability has a detrimental effect on word recognition accuracy under CI simulation, but only with different-gender talkers

Individual differences in top-down restoration of interrupted speech:Links to linguistic and cognitive abilities

Top-down restoration mechanisms can enhance perception of degraded speech. Even in normal hearing, however, a large variability has been observed in how effectively individuals can benefit from these mechanisms. To investigate if this variability is partially caused by individuals' linguistic and cognitive skills, normal-hearing participants of varying ages were assessed for receptive vocabulary (Peabody Picture Vocabulary Test; PPVT-III-NL), for full-scale intelligence (Wechsler Adult Intelligence Scale; WAIS-IV-NL), and for top-down restoration of interrupted speech (with silent or noise-filled gaps). Receptive vocabulary was significantly correlated with the other measures, suggesting linguistic skills to be highly involved in restoration of degraded speech. (C) 2014 Acoustical Society of Americ