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Other VEPs

Other visual evoked potential applications

QuestionAnswer
The VEP generated by onset and offset of a pattern resembles a typical pattern reversal VEP with pattern __ (onset/offset) offset
Four conditions in which VEP to onset and offset of a pattern have been reported to be abnormal hemispherectomy, MS, phenylketonnuria, schizophrenia
__ VEPs are those produced by pattern reversal atimuli at rates faster than those used by normal pattern reversal VEPs; they are essentially the superimposition of transient VEPs rhythmic
Rhythmic VEPs begin at rates of __ per second and are greatest at rates of __ - __ per second; at higher rates, larger check sizes are more effective 4, 6, 8
Repetitive flash stimuli result in a rhythmical wave; at rates above __ per second, there is an increasing phase lag proportion to the rate 10
The highest rate at which a steady state VEP can be distinguished is called the _________; it varies inversely with age critical frequency of photic driving
The mean critical frequency of photic driving for patients aged 20 - 30 72
The mean critical frequency of photic driving for patients aged 30-60 68
The mean critical frequency of photic driving for patients aged > 60 60
__ are alternating light and dark stripes with midlines of maximal and minimal luminance and gradual transitions between the maxima Sine-wave gratings
For transient VEPs to sine wave stimuli, the size of the pattern elements is maeasured in units as __ per __ cycles per degree of visual angle
With a sine wave grating pattern of < __ the response for sine wave grating pattern resembles that of a pattern reversal VEP 1 cycle per degree
Sine wave grating patterns > ___ c/d consist of two early and two late negative-positive peaks whose latency and amplitude vary with spatial frequency and cotnrast depth 1
MS leads to a __ latency in the majority of patients with VEPS to sine wave stimuli increased
Sine wave stimuli may add __ (more/less) diagnostic sensitivity to pattern reversal VEPs more
__ are alternating light and dark stripes with midlines of maximal and minimal luminance and gradual transitions between the maxima Sine-wave gratings
For transient VEPs to sine wave stimuli, the size of the pattern elements is maeasured in units as __ per __ cycles per degree of visual angle
With a sine wave grating pattern of < __ the response for sine wave grating pattern resembles that of a pattern reversal VEP 1 cycle per degree
Sine wave grating patterns > ___ c/d consist of two early and two late negative-positive peaks whose latency and amplitude vary with spatial frequency and cotnrast depth 1
MS leads to a __ latency in the majority of patients with VEPS to sine wave stimuli increased
Sine wave stimuli may add __ (more/less) diagnostic sensitivity to pattern reversal VEPs more
__ VEPS refer to VEPs that use a rhythm whose amplitude varies with spatial frequency and reaches a maximum at about a value that corresponds to the most effective checkerboard pattern steady state sine wave grating
The measurement of subjective contrast threshold at different spatial frequencies visuogram
Steady state VEPS to __ are used to plot spatial tuning curves -- i.e., plots of the ability to detect contrast sine wave grating
____ consist of light and dark stripes of equal width with sharp borders between them bar gratings
Maturation of the bar grating VEP occurs between __ and __ months of age 4, 6
The __ is elicited by recording using electrodes on the cornea, sclera or near the eye ERG
The two types of ERG patterned ERG, flash ERG
THe two waves of the ERG a, b
The a wave of the ERG to diffuse light is probably generated by __ photoreceptors
The b wave of the ERG to diffuse light is probably generated by __ glial Muller cells
The a wave of the ERG to diffuse light is cornea __ (negative/positive) negative
The b wave is cornea __ (negative/positive) positive
The ganglion cells of the retina generate the __ wave of the ERG to diffuse light (a/b/neither) neither
The __ wave of the ERG to diffuse light is generated by photoreceptors a
The __ wave of the ERG to diffuse light is generated by glial Muller cells b
Simultaneous recording of patterned __ with VEP can be used to distnguish retinal from central disorders ERG
Created by: schmittse