Contrast coding and magno/parvo segregation revealed in reaction time studies

I. J. Murray, S. Plainis

    Research output: Contribution to journalArticlepeer-review


    Reaction times (RTs) are obtained for a wide range of contrasts of vertical sinusoidal gratings. The data are plotted as a function of the reciprocal of contrast. In some conditions, a single linear function accounts for the data. In others a clear bi-linear function is obtained. The low and high contrast regions of the function are interpreted as representing magno and parvo activity, respectively. RT-based supra-threshold sensitivity functions are obtained for different luminances, stimulus durations and eccentricities and these are compared with conventional threshold-based sensitivities to establish the extent to which RTs and contrast sensitivity are constrained by the same sensory processes. © 2003 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)2707-2719
    Number of pages12
    JournalVision Research
    Issue number25
    Publication statusPublished - Nov 2003


    • Contrast spatial frequency
    • Magno-cellular
    • Parvo-cellular
    • Reaction times
    • Sinusoidal gratings


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