Abstract
Objective: To better characterize the properties of chromatic VEPs to onset-offset of red-green and blue-yellow equiluminant patterns, and establish normative values for a set of stimuli able to elicit robust and reliable responses, suitable for the clinical application. Methods: Chromatic VEPs have been recorded (Oz lead) from 28 normal subjects (age range 20-53 years) in response to monocular presentation of both red-green and blue- yellow equiluminant sinusoidal gratings. Stimuli were generated by a Cambridge VSG/2 card and displayed on a Barco CCID monitor (14 x 14 deg field size). Spatial frequency, chromaticity, contrast and onset-offset duration were varied. Results: For both red-green and blue-yellow equiluminant stimuli, robust responses have been obtained with gratings of 2 c/deg, presented in onset (300 ms) offset (700 ms) mode, at contrasts ranging from 90 to 6%. In all observers, the VEP waveform consisted mainly of a negative wave at stimulus onset, with a latency rapidly increasing with decreasing contrast. For both red-green and blue-yellow stimuli, the VEP contrast threshold coincided with the psychophysical threshold. Conclusions: The results complement previous studies aimed at characterizing the properties of chromatic VEPs. In addition, normative data are provided for a set of stimulus characteristics suitable for the clinical routine.
| Original language | English |
|---|---|
| Pages (from-to) | 772-781 |
| Number of pages | 10 |
| Journal | Clinical Neurophysiology |
| Volume | 110 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 1999 |
| Externally published | Yes |
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Keywords
- Chromatic contrast
- Koniocellular
- Luminance contrast
- Magnocellular
- Parvocellular
- VEPs
ASJC Scopus subject areas
- Clinical Neurology
- Radiology Nuclear Medicine and imaging
- Neurology
- Sensory Systems
- Physiology (medical)
Cite this
Normative data for onset VEPs to red-green and blue-yellow chromatic contrast. / Porciatti, Vittorio; Sartucci, Ferdinando.
In: Clinical Neurophysiology, Vol. 110, No. 4, 01.04.1999, p. 772-781.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Normative data for onset VEPs to red-green and blue-yellow chromatic contrast
AU - Porciatti, Vittorio
AU - Sartucci, Ferdinando
PY - 1999/4/1
Y1 - 1999/4/1
N2 - Objective: To better characterize the properties of chromatic VEPs to onset-offset of red-green and blue-yellow equiluminant patterns, and establish normative values for a set of stimuli able to elicit robust and reliable responses, suitable for the clinical application. Methods: Chromatic VEPs have been recorded (Oz lead) from 28 normal subjects (age range 20-53 years) in response to monocular presentation of both red-green and blue- yellow equiluminant sinusoidal gratings. Stimuli were generated by a Cambridge VSG/2 card and displayed on a Barco CCID monitor (14 x 14 deg field size). Spatial frequency, chromaticity, contrast and onset-offset duration were varied. Results: For both red-green and blue-yellow equiluminant stimuli, robust responses have been obtained with gratings of 2 c/deg, presented in onset (300 ms) offset (700 ms) mode, at contrasts ranging from 90 to 6%. In all observers, the VEP waveform consisted mainly of a negative wave at stimulus onset, with a latency rapidly increasing with decreasing contrast. For both red-green and blue-yellow stimuli, the VEP contrast threshold coincided with the psychophysical threshold. Conclusions: The results complement previous studies aimed at characterizing the properties of chromatic VEPs. In addition, normative data are provided for a set of stimulus characteristics suitable for the clinical routine.
AB - Objective: To better characterize the properties of chromatic VEPs to onset-offset of red-green and blue-yellow equiluminant patterns, and establish normative values for a set of stimuli able to elicit robust and reliable responses, suitable for the clinical application. Methods: Chromatic VEPs have been recorded (Oz lead) from 28 normal subjects (age range 20-53 years) in response to monocular presentation of both red-green and blue- yellow equiluminant sinusoidal gratings. Stimuli were generated by a Cambridge VSG/2 card and displayed on a Barco CCID monitor (14 x 14 deg field size). Spatial frequency, chromaticity, contrast and onset-offset duration were varied. Results: For both red-green and blue-yellow equiluminant stimuli, robust responses have been obtained with gratings of 2 c/deg, presented in onset (300 ms) offset (700 ms) mode, at contrasts ranging from 90 to 6%. In all observers, the VEP waveform consisted mainly of a negative wave at stimulus onset, with a latency rapidly increasing with decreasing contrast. For both red-green and blue-yellow stimuli, the VEP contrast threshold coincided with the psychophysical threshold. Conclusions: The results complement previous studies aimed at characterizing the properties of chromatic VEPs. In addition, normative data are provided for a set of stimulus characteristics suitable for the clinical routine.
KW - Chromatic contrast
KW - Koniocellular
KW - Luminance contrast
KW - Magnocellular
KW - Parvocellular
KW - VEPs
UR - http://www.scopus.com/inward/record.url?scp=0032909591&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032909591&partnerID=8YFLogxK
U2 - 10.1016/S1388-2457(99)00007-3
DO - 10.1016/S1388-2457(99)00007-3
M3 - Article
C2 - 10378751
AN - SCOPUS:0032909591
VL - 110
SP - 772
EP - 781
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
SN - 1388-2457
IS - 4
ER -