Visual hypo and hypergnosia as exemplars of poles of psychic tonus in the occipital lobes: multiple case analyses.

Abstract:

:The "psychic tonus" model or PTM [1] of hemispheric specialization states that the left hemisphere is a psychic and behavioral activator and that the right hemisphere is an inhibitor. The PTM predicts that the tonus of visual representation ought to manifest hemispheric specialization in the occipital lobes. Specifically PTM predicts that pathological positive visual tonus (visual hallucination) ought to be associated more frequently with right occipital lesions. PTM also predicts that pathological negative visual tonus (loss of visual imagery) ought to result more often from left occipital lesions. We reviewed 78 cases of post lesion hallucination and 12 cases of post lesion loss of evocation of images, all following a unilateral lesion. Analyses of these relevant previously published cases support the predictions. In accordance with previously published demonstrations of hemispheric specialization for auditory tonus in the temporal lobes and for somesthetic tonus in the parietal lobes, the present findings extend the psychic tonus model of hemispheric specialization to vision in the occipital lobes.

journal_name

Behav Neurol

journal_title

Behavioural neurology

authors

Braun CM,Guimond A

doi

10.1155/2008/139436

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

153-68

issue

4

eissn

0953-4180

issn

1875-8584

journal_volume

19

pub_type

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