The Science of Caricature
Leopold et al. found that individual face-recognizing neurons in the inferotemporal cortex respond more strongly to caricatured faces than to the veridical representations of the same face, and suggest that the visual brain may code faces relative to a prototypical face, consistent with Brennan's formalization.
Ramachandran and Hirstein suggested that caricature is related to peak shift. In the peak shift effect, animals sometimes respond more strongly to exaggerated versions of the training stimuli. For example, if a rat is trained to respond to a rectangle of a particular aspect ratio, and to avoid a square, when later presented with several rectangles it will prefer the one with the most elongated aspect ratio (this being the one that is most different from the square) rather than the original rectangle used in training. Ramachandran and Hirstein speculated that cells in a monkey brain that respond to particular faces would respond more strongly to caricatured versions of the face. This effect has been confirmed in FMRI experiments by Tsao.
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