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Abstract:
The performance of an adult with color agnosia (JT) was
investigated. Although perceptual color tests clearly demonstrated
no difficulty in color discrimination, multidimensional scaling
analysis (MDS) revealed that naming errors were constrained to
confusions of adjacent points in color space. This pattern of
confusions replicated across all tasks drawing on knowledge of
color concepts. The findings are interpreted as a partial
disruption in mapping perceptual representations of color to
exemplar nodes in 'conceptual' color space. We propose that this
method of investigation can generalize to other visual agnosia
types, particularly, category specific visual agnosia for
objects.
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