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    Incremental and decremental L- and M-cone driven ERG responses: I. Square-wave pulse stimulation.

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    Publication date
    2014-04
    Author
    McKeefry, Declan J.
    Kremers, Jan
    Kommanapalli, Deepika
    Challa, Naveen K.
    Murray, I.J.
    Maguire, John
    Parry, Neil R.A.
    Keyword
    Electroretinograms (ERGs): Square-wave L- and M-cone ERG responses; Isolating stimuli
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    Electroretinograms (ERGs) elicited by transient, square-wave L- and M-cone isolating stimuli were recorded from human trichromatic (n=19) and dichromatic (n=4) observers. The stimuli were generated on a 4 primary LED stimulator and were equated in terms of cone modulation (cone contrast = 0.11) and retinal illuminance (12,000 trolands). L- and M-cone isolated ERGs had waveforms similar to those observed for luminance responses. However, M-cone ERGs exhibited a phase reversal in their responses to onset and offset stimuli relative to the L-cone responses. This on-off response reversal was observed in trichromats but not dichromats. Simultaneous counter-phase and in-phase combinations of L- and M-cone isolating stimuli generated responses that reflected chromatic and luminance processing, respectively. We conclude that L- and M-cone specific ERGs provide a measure of how photoreceptors contribute to post-receptoral mechanisms.
    URI
    http://hdl.handle.net/10454/10243
    Version
    No full-text in the repository
    Citation
    McKeefry DJ, Kremers JJ, Kommanapalli D, Challa NK, Murray IJ, Maguire J and Parry NRA (2014) Incremental and decremental L- and M-cone-driven ERG responses: I. Square-wave pulse stimulation. Journal of the Optical Society of America A, 31(4): A159-169.
    Link to publisher’s version
    https://doi.org/10.1364/JOSAA.31.00A159
    Type
    Article
    Collections
    Life Sciences Publications

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