Journal article
Troubled reaching after right occipito-temporal damage
Neuropsychologia, Vol.30(8), pp.711-722
1992
DOI: 10.1016/0028-3932(92)90041-J
PMID: 1407487
Abstract
We encountered a man with an unusual reaching disturbance due to a stroke in the right occipito-temporal cortex and subjacent white matter. We studied his behavior in detail including vision and hand control. He had a left homonymous hemianopia. In his remaining fields static visual acuity and stereoacuity were normal, but he could not detect a coherent motion signal or follow moving targets with smooth pursuit. Transduction of limb movements using an optoelectronic technique showed abnormal morphology, increased variability and markedly prolonged latencies for transport to external visual targets, yet he achieved these targets with precision. Reaching to selfbound targets, and to the remembered locations of external targets with vision blocked was 5 × faster. The findings may be explained by: (1) damage in regions homologous to areas TF and TH in the monkey, which provide visual inputs to hand and forelimb representations in the cortex; (2) injury in human regions homologous to the monkey's MT complex, with inability to use visual information on the movement of the limb due to a visual motion processing defect; and (3) disruption of visual cortical-subcortical connections mediating crucial transformations among limb and target representations.
Details
- Title: Subtitle
- Troubled reaching after right occipito-temporal damage
- Creators
- Matthew Rizzo - University of IowaDiane Rotella - University of IowaWarren Darling - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Neuropsychologia, Vol.30(8), pp.711-722
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/0028-3932(92)90041-J
- PMID
- 1407487
- ISSN
- 0028-3932
- eISSN
- 1873-3514
- Language
- English
- Date published
- 1992
- Academic Unit
- Neurology; Physical Therapy and Rehabilitation Science; Health and Human Physiology
- Record Identifier
- 9984259403102771
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