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. 2020 Jun 23;30(3):8975. doi: 10.4081/ejtm.2020.8975

Fig 2.

Fig 2.

Number of pixels falling within the pupil as counted by using Photoshop. The labels “happy” and “anger” refer to the facial expression of the face participants were instructed to draw the pupils in with a pen. Overage people differentiated more between the two emotion categories. Error bars represent the standard error of the mean. Whereas the data is here presented in blocks of age, but age was treated as a continuous variable in the analysis