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Asymmetry in Facial Emotional Expression Abstract Research in the past has demonstrated that the right hemisphere of the brain is dominant in the perception and expression of emotion As a result of crossing of the nervous system the expectation was that the left side of the face would express emotion more intensely than the right This was tested by using left and right composite faces showing them to participants asking them to rate which of the two faces was more intense The finding was that participants judges the left composites to be more emotionally intense than the right composites thus supporting the hypothesis that there is asymmetry in the facial expression of emotion This finding leads to the conclusion that the right hemisphere is dominant in the perception expression and general procession of emotional information Crossing over of the nervous system occurs at the decussation of the pyramids this is a site just above the medulla-spinal cord junction at which the nerve fibres from either side of the brain cross over to the contralateral side of the body Marieb 1998 This means that the sensory information from the right side of the body goes to the contralateral side of the brain in this case the left hemisphere and vice versa Due to this cross over each hemisphere has motor control over the contralateral side of the body The brains hemispheres are specialised in their functions amongst others the left hemisphere is dominant in language mathematical reasoning and logical thinking The right hemisphere is dominant in facial recognition expression and spatial thinking These findings that the different hemispheres are specialised in their function have come from experiments performed on those with damage to specific parts of the brain thus being able to isolate the particular damaged area and experiment upon this Because the hemispheres are specialised in their functions the psyhcologists in the past have developed theories on asymmetry
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