Abstract
Primates are especially good at recognizing facial expression using two contrasting strategies—an individual diagnostic feature (e.g., raise eyebrows or lower mouth corner) versus a relationship between features. We report several novel experiments that demonstrate a profound role of grouping and segmentation—including stereo—on recognition of facial expressions.
Highlights
The idea of trigger features is well known in ethology
The trigger-like action of facial expressions can be seen in Figure 1(a), which shows that a wide range of expressions can be evoked using simple tilted lines, curves, and dots
Despite the fact that all details have been removed and the stimulus has been stripped to a bare minimum, it evokes recognition of emotions almost as powerfully as real photos
Summary
The idea of trigger features is well known in ethology. Instead of responding to the tout ensemble or gestalt—as is usually the case—the organism responds to certain diagnostic features that circumvent the need for high-level processing. The trigger-like action of facial expressions can be seen, which shows that a wide range of expressions can be evoked using simple tilted lines, curves, and dots (e.g., compare a smiley face with a frown).
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