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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Dev Sci. 2012 Jul;15(4):579–588. doi: 10.1111/j.1467-7687.2012.01154.x

Figure 1.

Figure 1

Examples of intra-personal and extra-personal difference images. In the top row, two different images of the same person are subtracted, yielding the difference image at the far right that captures intra-personal variation. In the bottom row, two images of two different individuals are subtracted, yielding an extra-personal difference image. In the model, these two classes of difference image are used to create separate face-spaces so that new difference images can be analyzed probabilistically.