Nonsymbolic-Magnitude Deficit in Adults With Developmental Dyscalculia: Evidence of Impaired Size Discrimination but Intact Size Constancy

Nirit Fooks, Bat Sheva Hadad, Orly Rubinsten

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1271-1284
Number of pages14
JournalPsychological Science
Volume32
Issue number8
DOIs
StatePublished - 1 Aug 2021
Externally publishedYes

Keywords

  • dyscalculia
  • magnitude deficit
  • magnitude perception
  • numerical cognition
  • size constancy

ASJC Scopus subject areas

  • Psychology (all)

Fingerprint

Dive into the research topics of 'Nonsymbolic-Magnitude Deficit in Adults With Developmental Dyscalculia: Evidence of Impaired Size Discrimination but Intact Size Constancy'. Together they form a unique fingerprint.

Cite this