Selective horizontal dysmetropsia following prestriate lesion

Francesca Frassinetti, Paolo Nichelli, Giuseppe Di Pellegrino

Research output: Contribution to journalArticlepeer-review

Abstract

We describe a patient (P.S.) who, following a right prestriate lesion, reported that objects in the left visual field appeared distorted and smaller than those on the right. Other aspects of visual processing were remarkably unaffected. We carried out a series of size comparison tests using simple or complex stimuli and requiring different types of behavioural responses. We found that P.S. significantly underestimated the size of stimuli presented in her left visual field. When comparison tasks involved stimuli placed along the vertical axis or in the right visual field, P.S. performed well. The vertical and horizontal components of size distortion were found to be differentially affected. We conclude that size processing may be dissociated from other aspects of visual processing, such as form or colour processing, and depends critically on part of the occipital, prestriate areas (Brodmann areas 18-19).

Original languageEnglish
Pages (from-to)339-350
Number of pages12
JournalBrain
Volume122
Issue number2
DOIs
Publication statusPublished - Feb 1999

Keywords

  • Dysmetropsia
  • Micropsia
  • Size perception
  • Visual perception

ASJC Scopus subject areas

  • Neuroscience(all)

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