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Visual speech processing: Word‐decoding and word‐discrimination related to sentence‐based speechreading and hearing‐impairment
Author(s) -
LYXELL BJÖRN,
RÖNNBERG JERKER
Publication year - 1991
Publication title -
scandinavian journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 72
eISSN - 1467-9450
pISSN - 0036-5564
DOI - 10.1111/j.1467-9450.1991.tb00847.x
Subject(s) - speechreading , psychology , word (group theory) , sentence , decoding methods , audiology , speech recognition , linguistics , natural language processing , computer science , medicine , telecommunications , philosophy
Two aspects of visual speech processing in speechreading (word decoding and word discrimination) were tested in a group of 24 normal hearing and a group of 20 hearing‐impaired subjects. Word decoding and word discrimination performance were independent of factors related to the impairment, both in a quantitative and a qualitative sense. Decoding skill, but not discrimination skill, was associated with sentence‐based speechreading. The results were interpreted such that, in order to represent a critical component process in sentence‐based speechreading, the visual speech perception task must entail lexically induced processing as a task‐demand. The theoretical status of the word decoding task as one operationalization of a speech decoding module was discussed (Fodor, 1983). An error analysis of performance in the word decoding/discrimination tasks suggested that the perception of heard stimuli, as well as the perception of lipped stimuli, were critically dependent on the same features; that is, the temporally initial phonetic segment of the word (cf. Marslen‐Wilson, 1987). Implications for a theory of visual speech perception were discussed.