Nonsymbolic-Magnitude Deficit in Adults With Developmental Dyscalculia: Evidence of Impaired Size Discrimination but Intact Size Constancy
| Autor: | Nirit Fooks, Bat-Sheva Hadad, Orly Rubinsten |
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| Rok vydání: | 2021 |
| Předmět: |
Adult
Psychometrics 05 social sciences Numerical cognition Dyscalculia Numerosity adaptation effect Mathematical Concepts medicine.disease Research Personnel 050105 experimental psychology 03 medical and health sciences Subjective constancy 0302 clinical medicine Developmental Dyscalculia medicine Humans 0501 psychology and cognitive sciences Cues Psychology 030217 neurology & neurosurgery General Psychology Cognitive psychology |
| Zdroj: | Psychological Science. 32:1271-1284 |
| ISSN: | 1467-9280 0956-7976 |
| DOI: | 10.1177/0956797621995204 |
| Popis: | Although researchers have debated whether a core deficit of nonsymbolic representation of magnitude underlies developmental dyscalculia (DD), research has mostly focused on numerosity processing. We probed the possibility of a general magnitude deficit in individuals with DD and asked whether sensitivity to size varied in contexts of depth ordering and size constancy. We measured full psychometric functions in size-discrimination tasks in 12 participants with DD and 13 control participants. Results showed that although people with DD exhibited veridical perceived magnitude, their sensitivity to size was clearly impaired. In contrast, when objects were embedded in depth cues allowing size-constancy computations, participants with DD demonstrated typical sensitivity to size. These results demonstrate a deficit in the perceptual resolutions of magnitude in DD. At the same time, the finding of an intact size constancy suggests that when magnitude perception is facilitated by implicit mandatory computations of size constancy, this deficit is no longer evident. |
| Databáze: | OpenAIRE |
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