Humans are expert at recognizing facial features whether they are variable (emotions) or unchangeable (gender). Due to its huge communicative value, pain might be detected faster in faces than unchangeable features. Based on this assumption, we aimed at finding a presentation time that will enable subliminal discrimination of pain facial expression without permitting gender discrimination. To this purpose, we compared in 80 subjects the time needed (50, 100 ,150 or 200ms) to discriminate masked static pain faces among anger and neutral faces with that needed to discriminate male from female faces.
from The Journal of Pain http://ift.tt/1MZkFyP
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