PSYC 2410 Chapter : Sensorimotor System.docx

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Sensory input in crucial for motor output. Parallel (signals flow between levels by multiple paths) Functionally segregated (each level composed of different units which perform different functions) Hierarchically organized (directed by commands that are cascaded down, allows higher levels of the hierarchy free to perform more complex functions) Downwards rather than upwards flow of information(different than other senses, because it is output) Many changes due to sensory feedback are controlled unconsciously by lower levels in hierarchy. Inputs: visual, auditory and somatosensory stimuli and the dorsolateral association cortex. Outputs: mostly directly to dorsolateral prefrontal association cortex and the various secondary motor cortexes and frontal eye field (controls directly eye movements and focusing of attention) Localization of body parts and external objects in space. Important for initiation of movements and deciding how to interact with objects. Apraxia: impaired: when requested conscious movements (asked to do movement) Please use this hammer to put nail in wall.

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