Kinesiology 1080A/B Study Guide - Midterm Guide: Mild Cognitive Impairment, Saccade, Frontal Lobe
14 Dec 2015
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Has direct spatial overlap between stimulus & response. It is often reflexive (short period of initiation). Takes around 180 ms to initiate. (reaction time) Must inhibit reflexive stimulus of a prosaccade (response. Then the person needs to do vector inversion. 180 degree spatial transformation of the targets location. Use same cortical & sub cortical visual networks as prosaccades. i. e. frontal cortex. Neurons are much more active in an antisaccade. Cause an increased activation in lateral intraparietal cortex. Thought to be a path to developing alzheimer"s disease. Perform poorly in antisaccade task in lab to test for alzheimer"s. Inability to inhibit functions of antisaccades (suppression). Switch cost- cost of switching from a prosaccade to an antisaccade. When you switch from prosaccade antisaccade no cost. When you switch from antisaccade prosaccade significant cost. Response suppression leads to residual inhibition of ocular networks. Slower reaction to pro-saccade after due to inhibition from anti-saccade. Snarc effect- spatial numerical association of response codes.
