The Effects of Body Position and Degree of Handedness on Cognitive Flexibility

Download or read book The Effects of Body Position and Degree of Handedness on Cognitive Flexibility written by Alyssa M. Mason and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Degree of hand preference is a robust indication of corpus callosum size, with individuals whose hand preference varies (called inconsistent-handers, or ICHs)typically having larger corpora callosa than individuals that prefer to use the same hand for most or all tasks (called consistent-handers, or CHs). A larger corpus callosum gives ICHs advantages on tasks that require the integration of information between the two hemispheres of the brain but is detrimental to their performance on tasks that require separation between the hemispheres. Thus, degree of hand preference is a trait variable that can explain individual differences in cognition. One's bodily posture affects cerebral activation, thereby producing cognitive changes as well. Cerebral activation largely favors the left hemisphere when seated; when standing, though, cerebral activity becomes more symmetrical and increases overall. Standing generally facilitates performance on tasks that require access to right-hemisphere processes or integration of information between the hemispheres. The present research aimed to examine the individual and interactive effects of handedness ad bodily posture on cognitive flexibility. In Experiments 1 and 2, participants were assigned to either sit or stand while performing tasks intended to measure cognitive flexibility. In Experiment 1, participants were presented with several ambiguous images and clicked the screen each time their perception of the image changed. In Experiment 2, participants read either a strong or weak argument in favor of comprehensive senior exit exams. No significant effects of handedness of posture emerged. Methodological considerations and limitations are discussed.