Neuroplasticity Flashcards
What systems are responsible for the synaptic plasticity adaptations?
2nd messenger systems are responsible for long term changes.
What is the name of the process by which the brain adapts after injury and in motor learning?
Neuroplasticity
CNS is “plastic”
After repeated synaptic input, the sensitive of _________ changes to improve efficiency and effectivity. This causes short (hours) and quasi permanent (days) change.
Post synaptic neuron
What factors contribute to increased synaptic boutons or increased sensitivity?
Increased neurotransmitter
Increased post synaptic receptors (up regulation)
Collateral growth
Dendritic spines
the battle for control over the alpha motor neuron after injury is known as
competitive use dependent plasticity
Research after SCI has shown that hyperreflexia are inversely related to what?
recovery of strength post injury
Short term changes after SC injury include _________ of receptors responding to remaining input.
upregulation
Long term changes after SC injury is related to _________ growth from Ia afferents that will take more control over the LMN.
collateral
H reflex is a laboratory measure of ______ stretch to measure DTR.
quick
With skill training, changes occur at all levels of CNS including
SC, cerebellum, basal ganglia, cerebral cortex
_______ influences compete against stretch afferents for influence over LMN.
descending
T or F: With strength training, force production increases even after a few reps.
True.
Early neural adaptations to strength training include
increased firing rate
synchronization of motor unit firing
Later neural adaptations to strength training include
increase in central nerual drive
increased motor neuron excitability
increased strength from mental imagery
some motor neurons hypertrophy so conduction velocity increases
Central neural drive describes the drive of the LMN by UMN and can be improved with strength training. The result is…
increased number of synapses on LMN
