Journal article
Lexical processing depends on sublexical processing: Evidence from the visual world paradigm and aphasia
Attention, perception & psychophysics, Vol.81(4), pp.1047-1064
05/2019
DOI: 10.3758/s13414-019-01718-3
PMCID: PMC6615952
PMID: 30945141
Abstract
Some early studies of people with aphasia reported strikingly better performance on lexical than on sublexical speech perception tasks. These findings challenged the claim that lexical processing depends on sublexical processing and suggested that acoustic information could be mapped directly to lexical representations. However, Dial and Martin (Neuropsychologia 96: 192-212, 2017) argued that these studies failed to match the discriminability of targets and distractors for the sublexical and lexical stimuli and showed that when using closely matched tasks with natural speech tokens, no patient performed substantially better at the lexical than at the sublexical processing task. In the current study, we sought to provide converging evidence for the dependence of lexical on sublexical processing by examining the perception of synthetic speech stimuli varied on a voice-onset time continuum using eye-tracking methodology, which is sensitive to online speech perception processes. Eight individuals with aphasia and ten age-matched controls completed two visual world paradigm tasks: phoneme (sublexical) and word (lexical) identification. For both identification and eye-movement data, strong correlations were observed between the sublexical and lexical tasks. Critically, no patient within the control range on the lexical task was impaired on the sublexical task. Overall, the current study supports the claim that lexical processing depends on sublexical processing. Implications for inferring deficits in people with aphasia and the use of sublexical tasks to assess sublexical processing are also discussed.
Details
- Title: Subtitle
- Lexical processing depends on sublexical processing: Evidence from the visual world paradigm and aphasia
- Creators
- Heather R Dial - Department of Communication Sciences and Disorders, University of Texas at Austin, 2504A Whitis Avenue (A1100), 4th Floor CMA, Austin, TX, 78712-0114, USA. heather.raye.dial@gmail.comBob McMurray - Department of Psychological and Brain Sciences, Department of Communication Sciences and Disorders, Department of Linguistics, Department of Otolaryngology, University of Iowa, Iowa City, IA, USARandi C Martin - Department of Psychological Sciences, Rice University, Houston, TX, USA
- Resource Type
- Journal article
- Publication Details
- Attention, perception & psychophysics, Vol.81(4), pp.1047-1064
- Publisher
- United States
- DOI
- 10.3758/s13414-019-01718-3
- PMID
- 30945141
- PMCID
- PMC6615952
- ISSN
- 1943-3921
- eISSN
- 1943-393X
- Grant note
- R01 DC008089 / NIDCD NIH HHS DC 008089 / NIH HHS F32 DC016812 / NIDCD NIH HHS
- Language
- English
- Date published
- 05/2019
- Academic Unit
- Communication Sciences and Disorders; Linguistics; Psychological and Brain Sciences; Iowa Neuroscience Institute; Otolaryngology
- Record Identifier
- 9984070799802771
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