Exploring the Williams Syndrome face-processing debate: the importance of building developmental trajectories
Karmiloff-Smith, Annette and Thomas, Michael S.C. and Annaz, Dagmara and Humphreys, K. and Ewing, S. and Brace, N. and van Duuren, M. and Pike, G. and Grice, Sarah and Campbell, R. (2004) Exploring the Williams Syndrome face-processing debate: the importance of building developmental trajectories. Journal of Child Psychology and Psychiatry 45 (7), pp. 1258-1274. ISSN 0021-9630.
Background: Face processing in Williams syndrome (WS) has been a topic of heated debate over the past decade. Initial claims about a normally developing (‘intact’) face-processing module were challenged by data suggesting that individuals with WS used a different balance of cognitive processes from controls, even when their behavioural scores fell within the normal range. Measurement of evoked brain potentials also point to atypical processes. However, two recent studies have claimed that people with WS process faces exactly like normal controls. Method: In this paper, we examine the details of this continuing debate on the basis of three new face-processing experiments. In particular, for two of our experiments we built task-specific full developmental trajectories from childhood to adolescence/ adulthood and plotted the WS data on these trajectories. Results: The first experiment used photos of real faces. While it revealed broadly equivalent accuracy across groups, the WS participants were worse at configural processing when faces were upright and less sensitive than controls to face inversion. In Experiment 2, measuring face processing in a storybook context, the face inversion effect emerged clearly in controls but only weakly in the WS developmental trajectory. Unlike the controls, the Benton Face Recognition Test and the Pattern Construction results were not correlated in WS, highlighting the different developmental patterns in the two groups. Again in contrast to the controls, Experiment 3 with schematic faces and non-face stimuli revealed a configural-processing deficit in WS both with respect to their chronological age (CA) and to their level of performance on the Benton. Conclusion: These findings point to both delay and deviance in WS face processing and illustrate how vital it is to build developmental trajectories for each specific task. Keywords: Williams syndrome, configural, holistic, featural, face processing, developmental trajectories, progressive modularisation of function.
|School:||Birkbeck Schools and Departments > School of Science > Psychological Sciences|
|Research Centre:||Nineteenth-Century Studies, Centre for, Birkbeck Knowledge Lab, Brain and Cognitive Development, Centre for (CBCD)|
|Depositing User:||Sarah Hall|
|Date Deposited:||15 Mar 2012 15:30|
|Last Modified:||06 Dec 2016 10:30|
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