NDLI: Simultaneous recording of multifocal VEP responses to short-wavelength and achromatic stimuli.

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Simultaneous recording of multifocal VEP responses to short-wavelength and achromatic stimuli.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhang, Xian Wang, Min Hood, Donald C.
Description	Country affiliation: United States Author Affiliation: Zhang X ( Radiology Department, Columbia University, Neurological Institute B41, 710 W. 168th Street, New York, NY 10032, USA. xz63@columbia.edu)
Abstract	A paradigm is introduced that allows for simultaneous recording of the pattern-onset multifocal visual evoked potentials (mfVEP) to both short-wavelength (SW) and achromatic (A) stimuli. There were 5 sets of stimulus conditions, each of which is defined by two semi-concurrently presented stimuli, A64/SW (a 64% contrast achromatic stimulus and a short-wavelength stimulus), A64/A8 (64% achromatic/8% achromatic), A0/A8 (0% (gray) achromatic/8% achromatic), A64/A0 and A0/SW. When paired with A64 as part of A64/SW, the SW stimulus yielded mfVEP responses (SWmfVEP) with diminished amplitude in the fovea, consistent with the known sensitivity of the S-cone system. In addition, when A8, which is approximately equal to the L and M cone contribution of the SW stimulus, was recorded alone, the response to A8 was small, but significantly larger than noise. However, when A8 was paired with A64, the response to A8 was reduced to close to noise level, suggesting that the LM cone contribution of the SWmfVEP can be suppressed by A64. When A64 was recorded alone, the response to A64 was about 32% larger than the mfVEP for A64 when paired with the SW. Likewise, the presence of A64 stimulus also reduces the response of SWmfVEP by 35%. Finally, an intense narrow-band yellow background prolonged the latency of SW response for the A0/SW stimulus but not the latency of SW response for the A64/SW stimulus. These results indicate that it is possible to simultaneously record an SWmfVEP with little LM cone contribution along with an achromatic mfVEP.
File Format	HTM / HTML
ISSN	00124486
e-ISSN	15732622
DOI	10.1007/s10633-010-9234-1
Journal	Documenta Ophthalmologica
Issue Number	2
Volume Number	121
Language	English
Publisher	Springer
Publisher Date	2010-10-01
Publisher Place	Netherlands
Access Restriction	Open
Subject Keyword	Discipline Ophthalmology Cone Opsins Radiation Effects Evoked Potentials, Visual Retina Physiology Photic Stimulation Principal Component Analysis Visual Fields Visual Pathways
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Physiology (medical) Sensory Systems

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