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Through blending a picture of a neutral face with a picture of an emotional face (happy or angry) six levels of intensity with intermediate morphing steps of 20 were created. The pictures were piloted beforehand. In the pilot the stimuli were shown on a projector in a lecture hall and 133 subjects finished the rating task using the same face stimuli and rating scale as in the present study. As the results of the pilot demonstrated minimal difference of the intensity ratings between 20 and 40%, the 20% level were excluded generating a set of five intensity levels exemplified in Figure ?Figure11 FIGURE 1 Examples of the morphed happy male face stimuli and angry female face stimuli ranging from neutral to happy or angry. Percent figures corresponding to amount of emotional face in blend where 0% is a fully neutral face and 100% is a fully angry or happy ... Each picture stimulus was presented in five different sizes with the original AKDEF size of 19.8 �� 26.9 cm used as the largest and corresponding to an almost natural face size of 16 cm (vertical visual angle 13.9��). The scaling was conducted using a factor of 0.75 resulting in the smallest picture having a face length of about 5 cm (vertical visual angle 4.3��). Assuming that size mimics distance, the range between the largest and the smallest face would in terms of distance to the stimuli correspond to approximately 65, 87, 117, 156, and 208 cm from the observer. Distance will be used as a term henceforth. The experiment was built using PsychoPy, an open Arginase source, free to use software (Peirce, 2007). The gray background was made to resemble the background of the picture and a raised cosine mask was applied to blur the edges of the picture. All participants used a 24-inch Benq GL2450 s3 monitor, except 4 who, due to technical issues performed the task on a 23-inch Dell 2313H monitor, both LED with a 1920 �� 1080 pixel dimension. Screen luminance measured during procedure 60 cm from the screen ranged �C depending on face stimuli size �C between 34.1 (large face) and 43.7 cd/m2 (fixation-cross). Psychophysical Outcome Measures The PI ratings were obtained using the Borg CR100 scale (Borg and Borg, 2001). The CR100 combines ratio scaling with verbally anchored category levels. It improves the inter-subjectivity of the measure as compared to free magnitude estimation. The CR100 ranges between a value of 0 labeled ��Nothing at all�� and ��Absolute maximum�� at above 110. In the present study the scale was computerized and to make it software compatible it was presented horizontally with the low end to the left and high end to the right. Valence was rated on a horizontal visual analog scale anchored at left (Negative) and right (Positive). The rating output was a continuous value between 0 and 1, the higher the more positive.