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Evoked potentials 1
| Question | Answer |
|---|---|
| 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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