Visual Evoked Potentials 01

Topic: Physiology

Created on Wednesday, October 17 2007 by jdmiles

Last modified on Wednesday, October 17 2007.

 
        A) N100 is the most useful and reproducible wave
 
        B) VEPs are useful in detecting anterochiasmatic lesions
 
        C) Refractive errors can affect the latency but not the amplitude of VEPs
 
        D) VEPs are obtained by stimulating the retina with light while recording electrical activity from the cornea
 
        E) Refractive errors do not affect the VEP in any significant way
 

 

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This question was created on October 17, 2007 by jdmiles.
This question was last modified on October 17, 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) N100 is the most useful and reproducible wave

This answer is incorrect.

P100 is the most useful and reproducible of the VEP waveforms.  (See References)

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B) VEPs are useful in detecting anterochiasmatic lesions

This answer is correct.

VEPS are helpful in detecting anterochiasmatic lesions, but are of limited usefulness in identifying retrochiasmatic lesions  (See References)

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C) Refractive errors can affect the latency but not the amplitude of VEPs

This answer is incorrect.

Refractive erros can affect both the latency and amplitude of VEPs.

  (See References)

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D) VEPs are obtained by stimulating the retina with light while recording electrical activity from the cornea

This answer is incorrect.

Electroretinograms are obtained by stimulating the retina with light while recording electrical activity from the cornea.  VEPs are obtained by recording from scalp electrodes placed over the occipital cortex, while having the subject observe visual stimuli such as a varying black and white checkerboard pattern.  (See References)

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E) Refractive errors do not affect the VEP in any significant way

This answer is incorrect.

Refractive errors can affect both the latency and amplitude of VEPs.

  (See References)

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References:

1. Zaidat, O.O., and Lerner, A.J. (2002). The Little Black Book of Neurology, 4th Edition. Mosby, St. Louis (ISBN:0323014151)

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physiology
Visual Evoked Potentials 01
Question ID: 101707066
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 10/17/2007
Modified: 10/17/2007
Estimated Permutations: 1092000