Abstract
Gradient effects of continuous acoustic detail revealed by event‐related potentials
The Journal of the Acoustical Society of America, Vol.119(5), pp.3245-3246
05/2006
DOI: 10.1121/1.4786041
Abstract
A growing body of research has demonstrated that lexical activation during online word recognition is systematically sensitive to continuous detail in the speech signal (Andruski et al., ‘‘The effect of subphonetic differences on lexical access,’’ Cognition 52, 163–187 1994; McMurray et al., ‘‘Gradient effects of within‐catagory phonetic variation on lexical access,’’ Cognition 26, B33–B42 2002). However, investigations of within‐category sensitivity to continuous phonetic cues using electrophysiological measures have typically been consistent with categorical perception (Sharma et al., ‘‘Acoustic versus phonetic representation of speech as reflected by the mismatch negatively event‐related potential,’’ Electroencephalography & Clinical Neurophys.: Evoked Potentials, 88, 67–71 1993; Phillips et al., ‘‘Auditory cortex accesses: Phonological categories: An MEG mismatch study,’’ J. Cogn. Neurosci. 12, 1038–1055 2000). This raises the possibility that these findings of gradiency are artifacts of the small number of comparisons made in priming experiments or the eye‐movement tasks themselves. This issue was addressed with event‐related potentials in a P3 categorization paradigm. Subjects heard tokens from beach/peach or dart/tart continua (9 steps, 0–40 ms of VOT). In each block of trials, one of the four words was the target; one button was pressed for the target word and a different button for any of the nontarget words. The amplitudes of the P2 and P3 components decreased continuously as VOT departed from the target. This was the case even when trials in which subjects identified the token as nontarget were excluded. These results favor a gradient view of lexical activation: lexical processing is gradiently sensitive to continuous speech cues and such cues may facilitate word recognition.
Details
- Title: Subtitle
- Gradient effects of continuous acoustic detail revealed by event‐related potentials
- Creators
- Joel DennhardtBob McMurraySteven LuckJoseph Toscano
- Resource Type
- Abstract
- Publication Details
- The Journal of the Acoustical Society of America, Vol.119(5), pp.3245-3246
- DOI
- 10.1121/1.4786041
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Language
- English
- Date published
- 05/2006
- Academic Unit
- Communication Sciences and Disorders; Psychological and Brain Sciences; Otolaryngology; Iowa Neuroscience Institute; Linguistics
- Record Identifier
- 9984071745402771
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