Underestimation of perceived number at the time of saccades

Paola Binda, M. Concetta Morrone, John Ross, David C. Burr

Research output: Contribution to journalArticlepeer-review

Abstract

Saccadic eye movements produce transient distortions in both space and time. Mounting evidence suggests that space and time perception are linked, and associated with the perception of another important perceptual attribute, numerosity. Here we investigate the effect of saccades on the perceived numerosity of briefly presented arrays of visual elements. We report a systematic underestimation of numerosity for stimuli flashed just before or during saccades, of about 35% of the reference numerosity. The bias is observed only for relatively large arrays of visual elements, in line with the notion that a distinct perceptual mechanism is involved with enumeration of small numerosities in the 'subitizing' range. This study provides further evidence for the notion that space, time and number share common neural representations, all affected by saccades.

Original languageEnglish
Pages (from-to)34-42
Number of pages9
JournalVision Research
Volume51
Issue number1
DOIs
Publication statusPublished - Jan 2011

Keywords

  • Number estimation
  • Parietal cortex
  • Remapping
  • Saccades
  • Subitizing

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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