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Effects of Brain Laterality on Decoding Accuracy for Facial Displays of Emotion
Unformatted Document Text:  Effects of Brain 11 verbal message in the right hemisphere. Furthermore, the left hemisphere is better suited for analytical processes and decision, whereas the right hemisphere is better suited for non-analytical or emotional processes and decisions (Stacks & Sellers, 1986). For example, in a heated debate with a friend, the left hemisphere would primarily be responsible for processing the arguments itself and deciding whether or not it was valid, whereas the right hemisphere would be primarily responsible for processing the emotional content of the messages. Individuals demonstrating anomalous dominance (AD) have different and more variable patterns of language than do those with standard dominance. Geschwind and Galaburda (1987) asserted that the anomalous dominant brain is reversed from the SD brain for handedness, language, and other skills, or is at least symmetrical in its processing of these functions. Thus, language would be more specialized in the right hemisphere than in the left, or would be processed symmetrically in both. Geschwind and Galaburda (1987) estimated that anomalous dominance is found in 30% to 35% of individuals. They suggested that AD could be genetically determined in some instances, or could be due to environment influences such a birth stress. Other explanations include a delayed development in the left hemisphere, or the accelerated growth of the right due to the presence of testosterone. Because the anomalous dominance group will consist of people in whom the development of asymmetry has been altered at various periods and to different degrees, Geschwind and Galaburda believed that those with anomalous dominance could be present in individuals at both the high and low ends of the scale of accomplishment. Thus, they will be a more variable population than SD individuals on a variety of performance measures. For example, there is an increased rate of lefthandedness (most likely to be AD) in those who are mathematically gifted (Kolata, 1983), as well as a high frequency of lefthandedness in cases of mental disability (Hicks & Barton, 1975).

Authors: Floyd, Kory. and Mikkelson, Alan.
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Effects of Brain 11
verbal message in the right hemisphere. Furthermore, the left hemisphere is better suited for
analytical processes and decision, whereas the right hemisphere is better suited for non-analytical
or emotional processes and decisions (Stacks & Sellers, 1986). For example, in a heated debate
with a friend, the left hemisphere would primarily be responsible for processing the arguments
itself and deciding whether or not it was valid, whereas the right hemisphere would be primarily
responsible for processing the emotional content of the messages.
Individuals demonstrating anomalous dominance (AD) have different and more variable
patterns of language than do those with standard dominance. Geschwind and Galaburda (1987)
asserted that the anomalous dominant brain is reversed from the SD brain for handedness,
language, and other skills, or is at least symmetrical in its processing of these functions. Thus,
language would be more specialized in the right hemisphere than in the left, or would be
processed symmetrically in both. Geschwind and Galaburda (1987) estimated that anomalous
dominance is found in 30% to 35% of individuals. They suggested that AD could be genetically
determined in some instances, or could be due to environment influences such a birth stress.
Other explanations include a delayed development in the left hemisphere, or the accelerated
growth of the right due to the presence of testosterone. Because the anomalous dominance group
will consist of people in whom the development of asymmetry has been altered at various
periods and to different degrees, Geschwind and Galaburda believed that those with anomalous
dominance could be present in individuals at both the high and low ends of the scale of
accomplishment. Thus, they will be a more variable population than SD individuals on a variety
of performance measures. For example, there is an increased rate of lefthandedness (most likely
to be AD) in those who are mathematically gifted (Kolata, 1983), as well as a high frequency of
lefthandedness in cases of mental disability (Hicks & Barton, 1975).


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