ACHROMATIC AND CHROMATIC PATTERN REVERSAL VEPs AND ERGs: A COMPARISON OF SPATIAL AND TEMPORAL RESPONSE PROPERTIES

Title ACHROMATIC AND CHROMATIC PATTERN REVERSAL VEPs AND ERGs: A COMPARISON OF SPATIAL AND TEMPORAL RESPONSE PROPERTIES
Author, Co-Author Angela Kothe, Gary Trick
Topic
Year
1992
Day
Sunday
Program Number
3:30 pm
Room
Ireland B
Affiliation
Abstract Much has been learned of the processing of achromatic and chromatic information in the human visual system. However, the extent to which pattern evoked cortical and retinal potentials can be used to monitor these processes has not been fully elucidated. Therefore, we investigated the spatial and temporal tuning properties of visual evoked potentials (pVEPs) and pattern reversal electroretinograms (pERGs) for achromatic and chromatic stimuli. Achromatic stimuli were high contrast black/white checks while chromatic stimuli were equiluminant (43.1 cd/m2) red/green checks. Transient (1Hz) and steady state (9Hz) responses were recorded using check sizes ranging from 0.25 deg to 2 deg. Three visually normal volunteers (25 to 41 years of age) were tested extensively. For achromatic stimuli, pERGs and pVEPs showed similar spatial tuning for the transient condition, but pERGs were consistently greater than pVEPs with this difference increasing with increased check size for the steady state condition. For chromatic stimuli, pERGs and pVEPs behaved in a similar manner for both the steady state and transient condition. The present findings indicate that chromaticity affects the pERG in much the same way as the pVEP, and suggests that the pERG is more sensitive in the more peripheral retina than is the pVEP.
Affiliation of Co-Authors
Outline