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L13. Sensory perturbations
Terms in this set (17)
Afferent pathways carry...
sensory information towards CNS
Efferent pathways carry...
motor commands away from CNS
What is sensorimotor control?
An complex integrated system that involves the CNS processing sensory information from the peripheries to produce an appropriate motor command
Sensorimotor control is important for...
- Basis of motor control
- Human interaction with environment
- Adaptations to different environments and people
- Performance optimisation
What is the sensory weighting/reweighting theory?
The nervous system gives different weightings to different sensory inputs according to importance
- Somatosensory: 70%
- Visual: 20%
- Vestibular: 10%
If a sensory system is obstructed, the loss of information is reweighted to other systems
What is the sensorimotor integration theory?
Based on prior knowledge and expectation, information from sensory systems is integrated and used to match motor output
What is the computational approach to sensorimotor control?
The goal is to optimise motor execution by recursively correcting movement based on sensory feedback
What are some invasive methods to perturb sensory systems?
- Anaesthesia, pneumatic cup (to knock out sensory input or end effector)
- Needle EMG (to measure muscle activation)
What are some non-invasive methods to perturb sensory systems?
- Sensory perturbations (eg. foam mat)
- Surface EMG, ultrasound, biomechanical assessments (motion capture, force platform, accelerometry)
What is posturography?
Can measure the effects of perturbing multiple sensory systems at the same time to study the integration of different sensory systems
What are examples of visual perturbations?
- EO vs EC
- Perturbation of parts of visual fields
- Optic flow
- Visual cues
What are some examples of vestibular perturbations?
- Hot and cold aural irrigation
- Galvanic vestibular stimulation
How is hot and cold aural irrigation applied?
hot and cold liquid is applied in a sinusoidal fashion to stimulate semicircular canals, eliciting self motion and the vestibular-occular reflex
How is galvanic vestibular stimulation applied?
2 electrodes placed on the left and right mastoid processes which affects firing rates of vestibular system, eliciting self motion
What are some examples of somatosensory perturbations?
- Mechanical perturbation (eg. pulls at knee or shoulders)
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