The Decision Processes Of The Posterior Parietal Cortex On Hand Choice And Usage

1213 Words Nov 13th, 2016 5 Pages
Decisions in life are inevitable, and although unavoidable, a majority of the decisions made with everyday behavior are repetitively overlooked. One of the most frequently disregarded decisions made in everyday life is which hand to use when performing actions such as grasping, writing, lifting, and gesturing. Copious studies suggest that the posterior parietal cortex is of paramount importance when executing hand actions and motions. Comparatively, past experiments exhibit bilateral posterior parietal cortex activation during one-handed movements with notable increases in the activity of the hemisphere contralateral to the active hand. Because posterior parietal cortex activity levels indicate relationships to hand choice, there are postulations that stimulation can interfere with set processes and ultimately alter hand selection. This two-part experiment investigates the decision processes related to hand selection during reaching movements as well as the influence of the posterior parietal cortex on hand choice and usage. Oliveria, Diedrichsen, Verstynen, Duque and Ivry (2010) hypothesize that decisions involving uncertainty or hesitation during one handed reaches will have increased reaction times and when utilizing transcranial magnetic stimulation, hand movements will be performed with the hand ipsilateral to the stimulated site. Within this particular study, the main independent variable is the presence of transcranial magnetic stimulation (stimulation of right…

Related Documents