1. Responses of the short wavelength sensitive (S-) cone mechanism were detected in the visual evoked response (VER) of the brain using ganzfeld flashes in the presence of a rod saturating ganzfeld background (17,000 phot td). 2. These S-cone responses were exposed by matching spectrally different stimuli to be approximately equivalent for generating electroretinograms (ERGs) mediated by the long (L-) and middle (M-) wavelength sensitive cones. The S-cone VER has a relatively larger amplitude, a later implicit time and a greater tendency to induce oscillations. Because of its longer latency, 130 ms for the inion positive response, the S-cone VER has been labeled component 3 to distinguish it from two earlier inion positive VER components (1 and 2) which are produced exclusively or almost exclusively by L and M cones. 3. Components 1 and 2 have implicit times of 64 and 98 ms respectively. Because component I is faster, smaller and does not seem to interact with the S-cone mechanism, it is suggested that it may reflect the magnocellular pathway.
|Original language||English (US)|
|Number of pages||9|
|Journal||Clinical Vision Sciences|
|State||Published - Dec 1 1993|
All Science Journal Classification (ASJC) codes
- L and M cones
- Visual evoked response