Trends in Cognitive Sciences
ReviewThe many faces of configural processing
Section snippets
Sensitivity to first-order relations
Adults have a remarkable ability to detect faces based on first-order relations, even in the absence of normal facial features, at least when the stimuli are upright (see Fig. 1) 2., 3.. Indeed, faces can play a special role in capturing attention. Newborns orient preferentially towards stimuli that have face-like first-order relations 4., 5. (but there are alternative explanations [6]), and patients with visual extinction are more likely to detect a face presented in the neglected hemifield
Holistic processing
When adults detect the first-order relations of a face, they tend to process the stimulus as a gestalt, making it harder to process individual features. The most convincing demonstration is the ‘composite face effect’. Subjects are slower and less accurate in recognizing the top half of one face presented in a composite with the bottom half of another face when the composite is upright and fused than when the composite is inverted or the two halves are offset laterally – manipulations that
Sensitivity to second-order relations
Because all faces share the same first-order relations, recognition of individual faces requires the encoding of information about subtle variations in the shape or spacing of the features. Second-order relations refer to the spatial distances among internal features [8] (e.g. the distance between the eyes). Adults can detect variations in these distances as small as one minute of visual angle, a value close to the limits of acuity [40].
To tap processing of second-order relations, a set of
Lessons from inversion
Although the effect of inversion typically is attributed to disruptions in detecting second-order relations 1., 49., we have noted that inversion of a face interferes with all three types of configural processing. Inversion delays the N170 (e.g. [9]) and increases fMRI activity in object regions 11., 20., presumably because of increased difficulty in detecting the first-order relations of a face. It mitigates both the composite face effect [30] and the part–whole recognition effect [33] that
Is configural processing unique to faces?
Although many researchers argue that configural processing is unique to faces, others suggest that it is used with other categories of objects, particularly if, like faces, the objects are homogeneous and the viewer has developed expertise in distinguishing individual members at the subordinate level. Most of the evidence is based on the inversion effect, which, as noted previously, is an inadequate diagnostic. For example, dog judges and breeders, but not novices, are less accurate in
Questions for future research
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To what extent do the different types of configural face processing reflect distinct versus overlapping neural mechanisms? Do they vary in lateralization?
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To what extent are the different types of configural face processing hierarchical? For example, does holistic processing follow and depend upon detection of first-order facial relations – both developmentally and within each instance of perceiving a face?
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What are the contributions of each type of configural processing to deficits in face
Acknowledgements
This work was supported by a National Science and Engineering (Canada) research grant to D.M. and a National Science and Engineering graduate scholarship to R.Le G. The second and third authors contributed equally to the manuscript and are listed in alphabetical order.
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