Perception of Speech Pattern Contrasts from Auditory Presentation of Voice Fundamental Frequency

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Abstract
The perception of phonologically significant speech pattern contrasts was measured in normally hearing subjects who were presented with Fo contours alone, speechreading alone, and the two in combination. For the suprasegmentals and final consonant voicing, perception in the combined condition was dominated by Fo. For the vowel, consonant place, and final consonant continuance contrasts, perception in the combined condition was dominated by vision. For initial consonant voicing and continuance, however, there was clear evidence of interaction between Fo and speechreading. Here, the combined score was higher than either of the single-modality scores, and also higher than could be predicted on the assumption that the auditory and visual channels act as statistically independent channels of information.