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Review the relationship between visual perception and visual mental imagery: a reappraisal of the neuropsychological evidence.
| Content Provider | CiteSeerX |
|---|---|
| Author | Bartolomeo, Paolo |
| Abstract | Visual perception and visual mental imagery, the faculty whereby we can revisualise a visual item from memory, have often been regarded as cognitive functions subserved by common mechanisms. Thus, the leading cognitive model of visual mental imagery holds that visual perception and visual imagery share a number of mental operations, and rely upon common neural structures, including early visual cortices. In particular, a single visual buffer would be used “bottom-up ” to display visual percepts and “top-down ” to display internally generated images. The proposed neural substrate for this buffer consists of some cortical visual areas organised retinotopically, that is, the striate and extrastriate occipital areas. Empirical support for this model came from the report of brain-damaged patients showing an imagery deficit which parallels a perceptual impairment in the same cognitive domain. However, recent reports of patients showing double dissociations between perception and imagery abilities challenged the perception-imagery equivalence hypothesis from the functional point of view. From the anatomical point of view, the available evidence suggests that occipital damage is neither necessary nor sufficient to produce imagery deficits. On the other hand, extensive left temporal damage often accompanies imagery deficits for object form or colour. Thus, visual mental imagery abilities might require the integrity of brain areas related to vision, but at an higher level of integration than previously proposed. Key words: visual perception, visual mental imagery, spatial imagery, object agnosia, prosopagnosia, achromatopsia, alexia, unilateral neglect, brain damage |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Neuropsychological Evidence Imagery Deficit Visual Perception Visual Mental Imagery Brain Damage Brain Area Proposed Neural Substrate Available Evidence Object Form Cortical Visual Area Imagery Ability Visual Imagery Share Visual Percept Visual Item Double Dissociation Upon Common Neural Structure Perceptual Impairment Temporal Damage Cognitive Model Occipital Area Occipital Damage Brain-damaged Patient Spatial Imagery Cognitive Function Early Visual Cortex Common Mechanism Cognitive Domain Mental Operation Single Visual Buffer Anatomical Point Visual Mental Imagery Ability Empirical Support Functional Point Recent Report Generated Image Perception-imagery Equivalence Hypothesis Unilateral Neglect Object Agnosia |
| Content Type | Text |
