APA 2120 Lecture 5: Lecture 5 – Preparation and Anticipation
15 Dec 2016
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Document Summary
Tri-phasic muscle activation pattern: 1st agonist burst (ag1) Burst amplitude and duration are accelerates limb dependent on movement amplitude (reflects force: antagonist burst (ant) Burst amplitude and timing influenced by movement extent and velocity (e. g. earlier onsets w/ small, fast movements) Helps to clamp limb at target position. Even though there was a block, the movement of the agonist and antagonist, and muscle pattern, stayed the same. Advance information about arm, direction or extent (amplitude) reduces rt by 100 150 ms: knowing which arm reduces rt by. 150 ms: knowing the amplitude of the movement reduces rt by 100 ms. However, reduction in rt cannot be explained simply as a reduction in uncertainty. Proven in lab that rt of a startle is much lower than rt of a controlled stimulus. When ppl are startled, they clench their neck from instinct (survival method)
