Brain responses of short-wavelength cones

P. Gouras, C. J. MacKay, M. Roy, S. Yamamoto

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

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 languageEnglish (US)
Pages (from-to)519-527
Number of pages9
JournalClinical Vision Sciences
Volume8
Issue number6
StatePublished - Dec 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ophthalmology

Keywords

  • Electroretinogram
  • L and M cones
  • S-cones
  • Visual evoked response

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    Gouras, P., MacKay, C. J., Roy, M., & Yamamoto, S. (1993). Brain responses of short-wavelength cones. Clinical Vision Sciences, 8(6), 519-527.