Detecting gradual visual changes in colour and brightness agnosia: a double dissociation

T.C.W. Nijboer*, S.F. te Pas, M.J. Van der Smagt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Two patients, one with colour agnosia and one with brightness agnosia, performed a task that required the detection of gradual temporal changes in colour and brightness. The results for these patients, who showed anaverage or an above-average performance on several tasks designed to test low-level colour and luminance (contrast) perception in the spatial domain, yielded a double dissociation; the brightness agnosic patient was within the normal range for the coloured stimuli, but much slower to detect brightness differences, whereas the colour agnosic patient was within the normal range for the achromatic stimuli, but much slower for the coloured stimuli. These results suggest that a modality-specific impairment in the detection of gradual temporal changes might be related to, if not underlie, the phenomenon of visual agnosia.
Original languageEnglish
Pages (from-to)175-180
Number of pages6
JournalNeuroReport
Volume22
Issue number4
DOIs
Publication statusPublished - 9 Mar 2011

Keywords

  • Psychologie (PSYC)

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