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Sentence context induces lexical bias in audiovisual speech perception

Sabine Windmann ; Institute of Psychology, Department of Cognitive Psychology II, Germany

Sažetak

The present study investigated whether semantic context enhances accuracy of word perception or merely induces a bias to perceive any speech input as a contextually appropriate word. Audiovisual speech tokens that were typically perceived as coherent words were com-pared with dubbed comparison stimuli that were not perceived as coherent words, either be-cause they did not allow for the fusion of the auditory and visual speech inputs (Experiment 1), or because successful fusion resulted in a lexically inappropriate phoneme (Experiment 2). These dubbed speech tokens were presented as endings of semantically congruent versus in-congruent sentences as subjects were asked to rate their lexical status (i.e., the word-likeness of the tokens). Results showed that subjects rendered enhanced lexicality ratings in semanti-cally congruent conditions relative to incongruent conditions, whether or not the evaluated token was perceived as a word, and whether or not it allowed for audiovisual fusion. This reflects an effect of sentence context on lexical bias, not sensitivity (i.e., accuracy). Results speak against a clear distinction between lexical and semantic levels of analysis and are there-fore inconsistent with models locating word recognition prior to semantic activation.

Ključne riječi

lexical decision; signal-detection theory; semantic context; audiovisual integration; top-down

Hrčak ID:

25577

URI

https://hrcak.srce.hr/25577

Datum izdavanja:

16.5.2008.

Posjeta: 962 *