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Loss of imagery phenomenology with intact visuo-spatial task performance: a case of 'blind imagination'

Zeman, A., Della Sala, S., Torrnes, L., Gountouna, V. E., McGonigle, David and Logie, R. 2010. Loss of imagery phenomenology with intact visuo-spatial task performance: a case of 'blind imagination'. Neuropsychologia 48 (1) , pp. 145-155. 10.1016/j.neuropsychologia.2009.08.024

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Abstract

The capacity for imagery, enabling us to visualise absent items and events, is a ubiquitous feature of our experience. This paper describes the case of a patient, MX, who abruptly lost the ability to generate visual images. He rated himself as experiencing almost no imagery on standard questionnaires, yet performed normally on standard tests of perception, visual imagery and visual memory. These unexpected findings were explored using functional MRI scanning (fMRI). Activation patterns while viewing famous faces were not significantly different between MX and controls, including expected activity in the fusiform gyrus. However, during attempted imagery, activation in MX's brain was significantly reduced in a network of posterior regions while activity in frontal regions was increased compared to controls. These findings are interpreted as suggesting that MX adopted a different cognitive strategy from controls when performing the imagery task. Evidence from experimental tasks thought to rely on mental imagery, such as the Brooks’ matrices and mental rotation, support this interpretation. Taken together, these results indicate that successful performance in visual imagery and visual memory tasks can be dissociated from the phenomenal experience of visual imagery.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Psychology
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Visual imagery; Phenomenology; Face perception
Publisher: Elsevier
ISSN: 0028-3932
Last Modified: 17 Jun 2017 02:57
URI: http://orca.cf.ac.uk/id/eprint/9085

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