Abstract
Developmental prosopagnosia (DP) is a selective neurodevelopmental condition defined by lifelong impairments in face recognition. Despite much research, the extent to which DP is associated with broader visual deficits beyond face processing is unclear. Here we investigate whether DP is accompanied by deficits in colour perception. We tested a large sample of 92 DP individuals and 92 sex/age-matched controls using the well-validated Ishihara and Farnsworth–Munsell 100-Hue tests to assess red–green colour deficiencies and hue discrimination abilities. Group-level analyses show comparable performance between DP and control individuals across both tests, and single-case analyses indicate that the prevalence of colour deficits is low and comparable to that in the general population. Our study clarifies that DP is not linked to colour perception deficits and constrains theories of DP that seek to account for a larger range of visual deficits beyond face recognition.
Highlights
Developmental prosopagnosia (DP) is a selective neurodevelopmental condition defined by lifelong impairments in face recognition
We found no correlations between Cambridge Face Memory Test (CFMT) scores and FM-100 scores in either group (DP rs(90) = − .15, p = .164; control rs(90) = − .16, p = .128) and across both groups ( rs(182) = .06, p = .461), again suggesting that face recognition and colour perception are dissociated abilities
In this study we addressed whether colour perception is impaired in DP
Summary
Developmental prosopagnosia (DP) is a selective neurodevelopmental condition defined by lifelong impairments in face recognition. Individuals with developmental prosopagnosia (DP) suffer from lifelong face-recognition deficits, despite having normal low-level vision and general intelligence[1,2,3]. This study found that the responses of the category-selective regions to their preferred stimuli, for both face and non-face categories, are much less selective in DP individuals than in controls This finding supports the notion that visual impairments in DP are not restricted to face processing, and it motivates more comprehensive research into a broader range of visual functions in DP. The proximity between face and colour regions in the ventral pathway suggests that face and colour processing might be more associated than previously thought This idea accords with the human patient literature. Studying DP with larger samples is important since DP is a heterogenous condition with a large range of individual p rofiles[3,22]
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