VOR Tophat Flashcards
T/F: target velocity is the stimulus for the VOR
false → eye movement is the stimulus for VOR
T/F: function of VOR is to generate eye orientation that best compensates for changes in position & orientation of the head
true
T/F: vestibular reflexes are not responsible for maintenance of overall body posture, equilibrium & muscle tone
false → vestibular reflexes are responsible
T/F: vestibular system contains two types of organs that transduce angular & linear acceleration of the head into velocity signals
true
T/F: macula of the saccule detect motion in the horizontal plane
false → detect motion in the vertical plane
*utricle detects motion in the horizontal plane
T/F: vestibular system uses two other organs known as otolith organs, to detect angular head movement
false → detects linear head movement (translation) & detect static head tilt
T/F: there are three-neuron reflex arcs involved in the vestibular neurophysiological pathway
true
T/F: VOR gain for horizontal head movement is slightly less than it is for vertical head movement
false → slightly greater than
T/F: for head rotation frequencies ranging from 0.5 to 5.0 Hz, the VOR gain is effectively 1.0
true
T/F: VOR latency is 140 ms
false → 16 ms
T/F: VOR is a closed-loop control system
false → open-loop control system
T/F: VOR gain is more than 1 in a person wearing hyperopic glasses
true
myopes = G<1
T/F: vestibular nucleus is the site of VOR adaptation
true
T/F: unilateral peripheral disorder cause oscillopsia
false → bilateral peripheral disorder
*unilateral causes transiet “imbalance” in vestibular tone
T/F: caloric induced nystagmus tests the central vestibular function
false → tests peripheral vestibular function
