Journal
LANGUAGE AND SPEECH
Volume 52, Issue -, Pages 341-350Publisher
KINGSTON PRESS SERVICES LTD
DOI: 10.1177/0023830909103178
Keywords
aftereffects; audiovisual speech; lipreading; recalibration
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Listeners hearing an ambiguous speech sound flexibly adjust their phonetic categories in accordance with lipread information telling what the phoneme should be (recalibration). Here, we tested the stability of lipread-induced recalibration over time. Listeners were exposed to an ambiguous sound halfway between /t/ and /p/ that was dubbed onto a face articulating either /t/ or /p/. When tested immediately, listeners exposed to lipread /t/ were more likely to categorize the ambiguous sound as /t/ than listeners exposed to /p/. This aftereffect dissipated quickly with prolonged testing and did not reappear after a 24-hour delay. Recalibration of phonetic categories is thus a fragile phenomenon.
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