EVS Flashcards

1
Q

why is stochastic vestibular stimulation used

A

unpredicable and hard to sandbag for testing

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2
Q

what can EVS do for older adults

A

can help with balance impairment

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3
Q

what is EVS balance response testing

A

low intensity current delivered through the skull, stimulating vestibular afferents
patients sway towards the positive electrode
(corrective balance response)
- afferents on the negative side increase firing
- afferents on the positive side decrease firing

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4
Q

what does EVS cause

A

physical perturbation to balance control through the VSR pathway

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5
Q

what does the direction of EVS evoked balance responses depend on

A

head position - craniocentric

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6
Q

what is the stochastic resonance effect

A

where sensitivity to a signal is increased by adding noise
balance is stabilised through noisy subthreshold EVS

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7
Q

what is the relationship between MLR/SLR latency and # of subconcussive sessions

A

more subconcussive sessions = longer MLR/SLR latency

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8
Q

what is the coherence difference in fighters vs non fighters

A

fighters = higher response to freqeuncies <5Hz adn lower responses to frequencies >5Hz
(coherence = correlation between EVS adn EMG in frequency domain)

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9
Q

what is the cumulant density difference in fighters vs non fighters

A

observe later responses in fighters compared to controls
(cumulant density = correlation between EVS and EMG in the time domain)

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10
Q

what is the difference in SVS in fighters vs non fighters

A

more repetitive head impacts = longer latency in MLR and SLR

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11
Q

does bipolar or monopolar have the higher recruitment threshold

A

monopolar
(four electrode binaural monopolar = highest response)

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12
Q

which type of sway requires much higher EVS amplitude in order to evoke sway

A

anterior/posterior sway

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