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Final

PSYC 280 Final: CH 5 MOTOR SYSTEM
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Department
Psychology
Course
PSYC 280
Professor
Neil Watson
Semester
Spring

Description
CH 5 MOTOR SYSTEM Motor behavior Movement: a single relocation of body part, usually resulting from a brief muscle contraction, less complex than an act Reflex: a simple, highly stereotyped, and unlearned response to a particular stimulus Act: complex behavior, VS a simple movement, eg getting dressed, walking, might result from simply connecting together different reflexes Motor plan (motor program): a plan for a series of muscular contractions, established in the nervous system prior to its execution, feedback from movements informs and fine turns the motor program. Eg when asked to pull up a lever, the person first adjusts his legs to steady himself Electromyography (EMG): the electrical recording of muscle activity Transcranial Magnetic Stimulation Mapping (TMS): suggests that while motor skills are being learned, the cortical representation for the muscles being used actually enlarges, and then shrinks down again after the skill is acquired, correspond to the automatic stage, and the learned skill is stored in supplementary motor cortex 6 categories in the hierarchy simple reflexes postural adjustments locomotion: walking, running, flying Sensory orientation: aiming sensors at stimulus sources (eg turning eyes toward light) Species typical behaviors (fixed action patterns): complex movements, but usually executed according to some prewired plan Acquired behaviors: motor skills acquired andor tuned through interaction with the environment Motor control systems Speed accuracy tradeoff 1. Closedloop movements feedback control, as it relies on sensory feedback to control movements. As a movement is executed, sensory info is used to determine the accuracy of the movement (feedback control) onthefly correction 2. Openloop movements Some movements require maximal speed, eg a predatory attack, escape In these movements, the entire sequence is preprogrammed, and then executed at once Ballistic Movement: it is not subject to feedback, and thus there is no onthefly correction 3. Combinations
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