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  • Title: Luminance-contrast mechanisms in humans: visual evoked potentials and a nonlinear model.
    Author: Zemon V, Gordon J.
    Journal: Vision Res; 2006 Nov; 46(24):4163-80. PubMed ID: 16997347.
    Abstract:
    Isolated-checks were luminance-modulated temporally to elicit VEPs. Bright or dark checks were used to drive ON or OFF pathways, and low or high-contrast conditions were used to emphasize activity from magnocellular or parvocellular pathways. Manipulation of stimulus parameters and frequency analysis of the VEP were performed to obtain spatial and contrast-response functions. A biophysical explanation is offered for why the opposite polarity stimuli drive selectively ON and OFF pathways in primary visual cortex, and a lumped biophysical model is proposed to quantify the data and characterize changes in the dynamics of the system with contrast given a limited number of parameters. Response functions were found to match the characteristics of the targeted pathways.
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