Does training with amplitude modulated tones affect tone-vocoded speech perception?

Autoři: Aina Casaponsa aff001;  Ediz Sohoglu aff001;  David R. Moore aff001;  Christian Füllgrabe aff001;  Katharine Molloy aff001;  Sygal Amitay aff001
Působiště autorů: Medical Research Council Institute of Hearing Research, Nottingham, England, United Kingdom aff001;  Department of Linguistics and English Language, Lancaster University, Lancaster, England, United Kingdom aff002
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article


Temporal-envelope cues are essential for successful speech perception. We asked here whether training on stimuli containing temporal-envelope cues without speech content can improve the perception of spectrally-degraded (vocoded) speech in which the temporal-envelope (but not the temporal fine structure) is mainly preserved. Two groups of listeners were trained on different amplitude-modulation (AM) based tasks, either AM detection or AM-rate discrimination (21 blocks of 60 trials during two days, 1260 trials; frequency range: 4Hz, 8Hz, and 16Hz), while an additional control group did not undertake any training. Consonant identification in vocoded vowel-consonant-vowel stimuli was tested before and after training on the AM tasks (or at an equivalent time interval for the control group). Following training, only the trained groups showed a significant improvement in the perception of vocoded speech, but the improvement did not significantly differ from that observed for controls. Thus, we do not find convincing evidence that this amount of training with temporal-envelope cues without speech content provide significant benefit for vocoded speech intelligibility. Alternative training regimens using vocoded speech along the linguistic hierarchy should be explored.

Klíčová slova:

Consonants – Learning – Perceptual learning – Phonology – Psychophysics – Speech – Speech signal processing – Syllables


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