discrimination
Pamela M. Pallett and Donald I. A. MacLeod
Abstract
Inversion dramatically impairs face perception, recognition, and
discrimination. Yet it does not interfere with the ability to make precise
estimates of facial feature distances. To investigate this discontinuity
between facial feature distance estimation and general perception and
recognition, we assessed the effect of inversion on the discrimination of
differences in facial compression and elongation or expansion using
geometrically distorted faces. The results clearly showed that geometrical
face discrimination is not subject to the traditional face inversion
effect and did not show a benefit for natural faces. Although
discrimination thresholds were not affected by inversion, response times
to the distance judgments were faster with inversion, especially when the
inverted faces contained natural configurations. Based on these
counterintuitive results, we suggest that participants used analytical
processing to do the discrimination task. Moreover, we suggest that the
depth with which a face is holistically encoded depends on the nature of
the task, face orientation, and similarity between a face and the
prototypical face template.
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