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. 2012 Aug 3;7(8):e42585. doi: 10.1371/journal.pone.0042585

Figure 1. Examples of happy expression at varying intensity levels.

Figure 1

The face labelled as ROI (region of interest) shows an example of the facial regions that were used in the eye-tracking analyses. The red, green and blue areas represent the eyes, nose and mouth regions, respectively. The copyrighter holder of the image has given written informed consent, as outlined in the PLoS consent form, to publication of their photograph.