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.2008 Aug;49(8):838-47.
doi: 10.1111/j.1469-7610.2008.01903.x. Epub 2008 Apr 17.

Atypical development of face and greeble recognition in autism

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Atypical development of face and greeble recognition in autism

K Suzanne Scherf et al. J Child Psychol Psychiatry.2008 Aug.

Abstract

Background: Impaired face processing is a widely documented deficit in autism. Although the origin of this deficit is unclear, several groups have suggested that a lack of perceptual expertise is contributory. We investigated whether individuals with autism develop expertise in visuoperceptual processing of faces and whether any deficiency in such processing is specific to faces, or extends to other objects, too.

Method: Participants performed perceptual discrimination tasks, including a face inversion task and a classification-level task, which requires especially fine-grained discriminations, on three classes of stimuli: socially-laden faces, perceptually homogenous novel objects, greebles, and perceptually heterogeneous common objects.

Results: We found that children with autism develop typical levels of expertise for recognition of common objects. However, they evince poorer recognition for perceptually homogenous objects, including faces and, most especially, greebles.

Conclusions: Documenting the atypical recognition abilities for greebles in children with autism has provided an important insight into the potential origin of the relatively poor face recognition skills. Our findings suggest that, throughout development, individuals with autism have a generalized deficit in visuoperceptual processing that may interfere with their ability to undertake configural processing, and that this, in turn, adversely impacts their recognition of within-class perceptually homogenous objects.

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Figures

Figure 1
Figure 1
Examples of upright and inverted face stimuli and developmental differences in sensitivity to face inversion plotted as mean accuracy and as a function of age in A) TD participants and B) HFA participants.
Figure 2
Figure 2
Examples of individual and gender discrimination trials during face recognition and developmental differences in sensitivity to the kind of discrimination plotted as mean accuracy (± 1 SEM) and as a function of age in A) TD participants and B) HFA participants.
Figure 3
Figure 3
Examples of individual and gender discrimination trials during Greeble recognition and developmental differences in sensitivity to the kind of discrimination plotted as mean accuracy (± 1 SEM) and as a function of age in A) TD participants and B) HFA participants.
Figure 4
Figure 4
Examples of exemplar and subordinate discrimination trials during common object recognition and developmental differences in sensitivity to kind of discrimination plotted as mean accuracy (± 1 SEM) and as a function of age in A) TD participants and B) HFA participants.
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