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Code-dependent pathways for number transcoding: evidence from a case of selective impairment in written verbal
J Macoir1, T Audet, M F Breton
1Centre de recherche en gérontologie et gériatrie, Sherbrooke, Canada. jmacoir@courrier.usherb.ca
Summary
A brain-damaged patient (RR) has a selective deficit in number transcoding, specifically with written verbal numerals to Arabic numerals. This finding suggests distinct pathways for number transcoding based on input modality.
Area of Science:
- Cognitive Neuroscience
- Neurolinguistics
- Psychology of Numbers
Background:
- Investigating the cognitive architecture of number processing.
- Understanding the neural basis of numerical cognition and transcoding.
- Examining deficits in number processing following neurological insults.
Observation:
- Patient RR exhibits a selective impairment in transcoding written verbal numerals to Arabic numerals.
- Other number transcoding abilities (e.g., Arabic to dictation) and number processing skills (recognition, comprehension, calculation) remain intact.
- Errors in transcoding correlate with the syntactical structure of verbal numerals.
Findings:
- Existing semantic and asemantic models of number processing do not fully explain patient RR's performance.
- A revised model is proposed, positing separate code-dependent pathways for transcoding spoken versus written verbal numerals.
- These pathways should incorporate the structural properties of the verbal number system, including sum and product relationships.
Implications:
- Suggests a more nuanced understanding of the neural substrates for number transcoding.
- Highlights the importance of input modality and numerical structure in number processing models.
- Informs theories of cognitive architecture and potential rehabilitation strategies for number processing deficits.