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  • Title: Summation of rod and cone responses at absolute threshold.
    Author: Drum B.
    Journal: Vision Res; 1982; 22(7):823-6. PubMed ID: 7123867.
    Abstract:
    Visual thresholds were measured for rod stimuli, cone stimuli and mixtures of rod and cone stimuli. Comparisons of the rod and cone thresholds to the corresponding components of the mixed-stimulus thresholds revealed summation between subthreshold rod and cone responses. The amount of summation was less than linear addition but greater than either probability summation of orthogonal vector addition.
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