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The effects of visual cortex lesions on the perception of rotated shapes
- Source :
- Behavioural Brain Research. 76:127-142
- Publication Year :
- 1996
- Publisher :
- Elsevier BV, 1996.
-
Abstract
- Monkeys with inferior temporal cortex lesions cannot discriminate between different shapes (e.g., + vs. 0) but can discriminate between shapes that differ only in orientation (e.g., 6 vs. 9). Lesions of the parietal cortex, on the other hand, impair the discrimination of rotated shapes but spare the ability to discriminate between different shapes. A similar dissociation is found between some visual agnosics who can match but not identify rotated views of objects and other patients who can identify and discriminate objects only if the view is conventional; any change in orientation disrupts performance. In this paper we argue that two mechanisms may be available for the perception of rotated shapes. Which mechanism is used depends on the degree of rotation. It is suggested that the different effects of parietal and temporal lesions reflect the relative contributions of the two areas to the task and disrupt different stages of the two strategies used. A framework for the cortical processing of rotated shapes in the non-human primate is presented.
- Subjects :
- Primates
Dissociation (neuropsychology)
media_common.quotation_subject
Posterior parietal cortex
Cortical processing
Perceptual Disorders
Behavioral Neuroscience
Discrimination, Psychological
Parietal Lobe
Perception
medicine
Animals
Humans
Visual Pathways
Shape constancy
Visual Cortex
media_common
Temporal cortex
Perceptual Distortion
Temporal Lobe
Form Perception
Visual cortex
medicine.anatomical_structure
Categorization
Space Perception
Agnosia
Psychology
Neuroscience
Subjects
Details
- ISSN :
- 01664328
- Volume :
- 76
- Database :
- OpenAIRE
- Journal :
- Behavioural Brain Research
- Accession number :
- edsair.doi.dedup.....b153c47a4777f1829f413f170708a5b3