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Evoked potentials 1

QuestionAnswer
Visual evoked potentials are typically: near, far or mixed field potenials near
Brainstem auditory evoked potentials are near, far or mixed field potentials far
Somatosensory evoked potentials are near, far or mixed field potentials mixed
Most evoked potentials are ___ (near/far/mixed) field potentials far
__ (near/far/mixed) field potentials typically have a triphasic appearance far
Flashing a light during a VEP assesses the __ components of the pathway anterior
If a pattern reversal stimulus during a VEP is exceptionally fine, it is challenging to determine if there is a problem with __ or a problem with the visual pathways refraction
The __ of a stimuli affects the time required to obtain the number of acquisitions for an adequate study frequency
Routine VEP is performed with a pattern shift at < __ Hz, leading to a transient pattern 4
Routine VEP performance at 1 - 2 Hz leads to a __ VEP transient
At frequencies > 5 Hz, a ___ VEP is generated, with measurable amplitudes steady state
Stimulus intensity determines the __ of response amplitude
The __ is the minimum intensity at which a measurable response can be elicited threshold
The averages singal to noise ratio is a function of the ratio of the single trial SNR to the: (1) Number of trials, (2) Square root of the number of trials, (3) Number of trials squared Square root of the number of trials
If a response has an amplitude of 10 microvolts and a surrounding noise of 100 microvolts, the SNR is 0.1. To improve it to 1, we would need to average ___ responses 100
The inverse of the sampling rate sampling interval
An older name for the sampling interval dwell time
__ is a circuit element composed of a coil of wire, which generates a magnetic field inductor
The induction of electron movement in electrode and cable leads by nearby lines is termed ____ stray inductance
__ is an error in frequency encoding caused by a too-slow sampling rate aliasing
When establishing EP norms for a new lab, you must test at least __ normal subjects at the new lab 20
When establishing norms for a new lab, you must show that 20 normal subjects at the new lab fall within -- - --% of normal ranges for data from the reference lab 95, 99
THe most common cause for increased latency on an EP demyelination
THe underlying cause of decreased amplitude on an EP dispersion of neuronal conduction
Abnormalities in EP waveform shape are thought to reflect abnoralities in __ __ of structures generating the wave spatial orientation
Created by: schmittse
 

 



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