On the different roles of the cerebral hemispheres in mental imagery: The "o'Clock Test" in two clinical cases

Dario Grossi, Antonino Modafferi, Luciana Pelosi, Luigi Trojano

Research output: Contribution to journalArticlepeer-review

Abstract

This paper develops the hypothesis of different roles of the two hemispheres in imaginal processes. A test designated the "o'Clock Test" is proposed, which contains closely confrontable perceptual and imaginal tasks. It enables examination of the abilities both to generate mental images and to explore them in their right and left halves (R + L Condition). This test was used to examine two patients, one severely affected by hemi-inattention resulting from a right posterior lesion, and the other with a selective deficit of imagery due to a left occipital lesion. The former demonstrated left neglect in both perceptive and imaginal capacities, while the latter was able to perform correctly only the perceptive tasks. These results suggest that the right hemisphere has functions of organization and spatial exploration at both perceptive and imaginal levels, and that the left hemisphere's role is to generate mental images.

Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalBrain and Cognition
Volume10
Issue number1
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology
  • Neuropsychology and Physiological Psychology

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