REPRESENTATION ACTIVITY OF THE RIGHT AND HEMISPHERES OF THE BRAIN
Journal Title: Acta Neuropsychologica - Year 2003, Vol 1, Issue 1
Abstract
[b]Background.[/b] The asymmetry of the cerebral hemispheres in terms of function has been studied for many years, using a wide variety of methods. The purpose of the present study was to examine the effects of the predominance of one or the other hemisphere on the drawings of patients, using an interpretational paradigm based on a theoretical distinction between visible and objective geometry. [b]Material and methods.[/b] Drawings by psychiatric patients were studied in various states: (i) in depression; (ii) after injection of neuroleptics; (iii) during left hemisphere suppression induced by unilateral electroconvulsive seizure (UES). In any of these states, right hemisphere activation predominates. Patient drawings were also investigated in (i) manic state; (ii) after injection of psychotropic drugs which improved mood; (iii) during right hemisphere suppression following right-sided UES. Under these conditions left hemisphere activation predominates.[b]Results.[/b] When right hemisphere activates predominates, the drawings are vivid, original, and distinctive, with sensory authenticity of the represented objects. The illusion of spatial three-dimensionality is reproduced. The represented scenes are drawn near to the observer at the cost of an increase in dimensions, with a prevalence of reverse perspective. With predominant left hemisphere activation, the patients' drawings lose the illusion of three-dimensionality. This is achieved via schematization and employment of technical drawing methods. The drawings lose vividness and likeness to the object; the represented scene is removed from the observer via a decrease in dimensions and perspective reductions. [b]Conclusions.[/b] Under the predominance of right hemisphere activation, one observes a tendency to reproduce the object's image and to represent it in the near space. Under the predominance of left hemisphere activation, there is a tendency to reproduce knowledge, an idea of the object, and to represent it in the distant space.
Authors and Affiliations
Nikolay Nikolaenko
Keywords
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