Multiple-domain dissociation between impaired visual perception and preserved mental imagery in a patient with bilateral extrastriate lesions

Paolo Bartolomeo, Gianfranco Dalla Barba, Ac Bachoud Lévi, B De Gelder, G Denes, P Brugières, Jd Degos

Risultato della ricerca: Contributo in rivistaArticolo in rivista

80 Citazioni (Scopus)

Abstract

A brain-damaged patient is described whose pattern of performance provides insight into both the functional mechanisms and the neural structures involved in visual mental imagery. The patient became severely agnosic, alexic, achromatopsic and prosopagnosic following bilateral brain lesions in the temporo-occipital cortex. However, her mental imagery for the same visual entities that she could not perceive was perfectly preserved. This clear-cut dissociation held across all the major domains of high-level vision: object recognition, reading, colour and face processing. Our findings, together with other reports on domain-specific dissociations and functional brain imaging studies, provide evidence to support the view that visual perception and visual mental imagery are subserved by independent functional mechanisms, which do not share the same cortical implementation. In particular, our results suggest that mental imagery abilities need not be mediated by early visual cortices.
Lingua originaleEnglish
pagine (da-a)239-249
Numero di pagine11
RivistaNeuropsychologia
Volume36
Stato di pubblicazionePubblicato - 1998

Keywords

  • Aged
  • Agnosia
  • Cerebrovascular Disorders
  • Color Perception
  • Dyslexia, Acquired
  • Female
  • Form Perception
  • Humans
  • Imagination
  • Magnetic Resonance Imaging
  • Occipital Lobe
  • Temporal Lobe
  • Visual Perception

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