motor systems Flashcards
Action networks:
What does the prefrontal cortex do?
Plans movement
Update, shift, inhibit
Action networks:
What does the premotor cortex do?
Integrates movement sequences
Action networks:
What does the supplementary cortex do?
Sequences specific movement
Action networks:
What does the Motor cortex do?
Produces specific movement
Action networks:
What does the Posterior cortex do?
Provides sensory information to the frontal cortex
Motor cortex:
Primary (Lateral)
How is it organized?
Somatotopic:
- relates to body
- contralateral
Motor cortex:
Primary (lateral)
population coding is what?
Summing across firing rates results in population “vector”
Directional
representation
Motor cortex:
Organization Problem?
Long duration stimulation
1) envoke complete action
2) coding for proximity of movement
3) allocentric end-goal
4) coding for complex movements
Coding for a forthcoming movement
Motor cortex:
Supplementary (Medial) is responsibe for what? (2)
Movement lexicon
- constrained by anatomy
- evo. predisposition
Sequencing
- highly goal-directed learned actions
- order
- timing
Motor cortex:
What does the Premotor do? (3)
Planning (Organizing sequences)
-hierarchical integration of sequenced movement lexicon
Interpreting
- conceptual representation
- mirror neurons
Intergration
- sensory modality
- Executive function (Embodied cognition)
Basal Ganglia
What effect does it have on movement?
Initiate and inhibit movement (DA)
Basal Ganglia
Direct pathway
Selection and initiation
C–> P –> GPi –> T
Basal Ganglia
Indirect pathway
Inhibiting (Competing response )
C –> P –> GPe –> SN –> GPi –> T
Cerebellum:
What does feed forward control do?
(Speed)
-create plans, fast
sensory
Cerebellum:
waht does feedback control do?
Accuracy adjust based on errors -evaluate plans (Slow) -learning -motor -speed/accuracy tradeoff -Vestibular system
