There was a study published recently Nature Neuroscience that shows fear and disgust to be anti-faces. So from a normal neutral face position fear would be a lengthening of the facial features and disgust would be the opposite movement or a closing down of the openings in the eyes and nostrils. The article gets into evolutionary origins of this kind of behavior. But for the standpoint of artistic representation and photo manipulation you can ignore all that and just concentrate on what this tells you about how to warp the facial features to portray or extend the perception of these 2 mirror image emotions.

Of course you could use the various Studio Artist warp tools to help create these kinds of facial emotion manipulation effects from neutral facial photo head shots. Being able to invert a particular warp in the opposite direction seems useful for this kind of thing, so i'm looking into providing an easy way to do that with the new inverse warp paseq context functionality.

One interesting thing to think about is whether the neural perception of these 2 facial emotions literally corresponds to an axis in a neural multi-dimensional facial emotion perceptual space. You could think of this as an analogy to the 2 chrominance axis (red-green, yellow-blue) for color perception. And of course the same analogies for color opponent interaction that can be used in artwork could also apply to these 2 facial emotions being played off of one-another.

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Comment by liveart on August 9, 2008 at 1:44am
hmm Interesting.. I wonder what effect could be created by overlaying these images using different visual perceptive vectors.. e.g. texture and color, or high and low frequency. One should be able to get and image that oscillates between the two faces and thus between the 2 emotions.
Comment by Synthetik Software on August 9, 2008 at 7:35am
That's an interesting idea. You should give it a try. You could use warping to take neutral emotion faces and move them in either direction.

There are studies that have been done that show effects similar to what happens with something like opponent colors and color perception where you can get after effects or bias after seeing face images with one emotion. It supports the notion of their being perceptual opponent channels for various emotions, just like opponent channels for color (red-green,yellow-blue).

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