Hemispatial asymmetries in judgement of stimulus size

J. Charles, Arash Sahraie, Peter McGeorge

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Recent research has demonstrated a leftward bias in judgments of size. In the present experiments, hemispatial size bias was measured through simultaneous presentation of a circle and an ellipse varying in horizontal or vertical extent. A consistent leftward bias of horizontal size judgments (but not vertical) was obtained; at the point of subjective equality, the width of the objects that were presented in left hemispace was smaller than the width of the objects that were presented in right hemispace. These data suggest that the horizontal extent of stimuli appear larger in left hemispace than in right hemispace. Results also indicated that symmetrical stimulus presentation, with respect to the vertical meridian, is required for the bias to emerge. Furthermore, increasing or decreasing stimulus eccentricity weakened the effect. Attenuation of this bias upon the manipulation of parameters indicates that this phenomenon is context specific and is affected by similar parameters that are known to influence the magnitude of error in pseudoneglect.

Original languageEnglish
Pages (from-to)687-698
Number of pages11
JournalPerception and Psychophysics
Issue number5
Publication statusPublished - Jul 2007


  • viewing perceptual asymmetries
  • line-bisection judgments
  • visual neglect
  • visuospatial attention
  • bilateral symmetry
  • mirror symmetry
  • pseudoneglect
  • space
  • bias
  • metaanalysis


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