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    Short-term perceptual reweighting in suprasegmental categorization

    Jasmin, Kyle and Tierney, Adam and Obasih, C. and Holt, L. (2022) Short-term perceptual reweighting in suprasegmental categorization. Psychonomic Bulletin & Review , ISSN 1069-9384.

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    Abstract

    Segmental speech units such as phonemes are described as multidimensional categories whose perception involves contributions from multiple acoustic input dimensions, and the relative perceptual weights of these dimensions respond dynamically to context. For example, when speech is altered to create an “accent” in which two acoustic dimensions are correlated in a manner opposite that of long-term experience, the dimension that carries less perceptual weight is down-weighted to contribute less in category decisions. It remains unclear, however, whether this short-term reweighting extends to perception of suprasegmental features that span multiple phonemes, syllables, or words, in part because it has remained debatable whether suprasegmental features are perceived categorically. Here, we investigated the relative contribution of two acoustic dimensions to word emphasis. Participants categorized instances of a two-word phrase pronounced with typical covariation of fundamental frequency (F0) and duration, and in the context of an artificial “accent” in which F0 and duration (established in prior research on English speech as “primary” and “secondary” dimensions, respectively) covaried atypically. When categorizing “accented” speech, listeners rapidly down-weighted the secondary dimension (duration). This result indicates that listeners continually track short-term regularities across speech input and dynamically adjust the weight of acoustic evidence for suprasegmental decisions. Thus, dimension-based statistical learning appears to be a widespread phenomenon in speech perception extending to both segmental and suprasegmental categorization.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Speech, Prosody, Dimension-based statistical learning, Suprasegmental speech, Perceptual cue weighting
    School: School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 23 Nov 2022 16:08
    Last Modified: 23 Nov 2022 23:56
    URI: https://eprints.bbk.ac.uk/id/eprint/49966

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