Goal-Directed Behavior and Reflexive Behavior. Goal-Directed Behaviors Require:. Goal selection and prioritization Resistance to distracters -Cross-modal Sensory integration Perception of target Awareness of location of movable body part Ability to aim movement of body part - PowerPoint PPT Presentation
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Goal-Directed Behavior and Reflexive Behavior
Goal-Directed Reflex
Relatively Complex Relatively Simple
Consciousness? Intention Automatic
Plastic Relatively Inplastic
Requires Cortex Cortex not required
Learning /experiences are major influence
Genetics are major influence
Goal-Directed Behaviors Require:
• Goal selection and prioritization• Resistance to distracters
-Cross-modal Sensory integration– Perception of target– Awareness of location of movable body part– Ability to aim movement of body part– Ability to detect errors and re-adjust, (use
feedback)– Ability to use feedback to control movement of
body part
Sensory-Motor Integration in the frontal lobes
THE DLPFC: “The conductor”Integrates cross modal input- may initiate goal-directed behaviors
Lesions of the dorsolateral frontal areas results in a number of “executive” motor impairments. These include perseveration, incoordination, motor impersistence, apraxias and hypokinesia. http://www.youtube.com/watch?v=p_uhP1vDfoo
The premotor and supplementary motor ctx: “The sections”
Stimulation= complex sequences of behavior (aimless behavior)
Damage to the secondary Motor Cortex?
• Ideomotor Apraxia• This apraxia is associated with great difficulty in the sequencing and
execution of movements. A common test of apraxia is to request the patient to demonstrate the use of a tool or household implement (e.g., "Show me how to cut with scissors"). Difficulties are apparent when the patient moves the hand randomly in space or uses the hand as the object itself, such as using the forefinger and middle finger as blades of the scissors. They have additional trouble sequencing the correct series of movements and make errors in orienting their limbs in space consistent with the desired action. Imitation of the movements of others will usually improve performance but it is still usually defective.
• Memories for skilled acts are probably stored in the angular gyrus of the parietal lobe in the left hemisphere.