Probing the limits of the Talbot-Plateau law
The Talbot-Plateau law specifies what combinations of flash frequency, duration, and intensity will yield a flicker-fused stimulus that matches the brightness of a steady stimulus. It has proven to be remarkably robust in its predictions, and here we provide addition support though the use of a contrast discrimination task. However, we also find that the visual system can register contrast when the combination of frequency and duration is relatively low. Flicker-fused letters are recognized even though they have the same physical luminance as background. We propose that this anomalous result is produced by large disparities in the duration of bright and dark components of the flash cycle, which brings about unexpected differential activation of ON and OFF retinal channels.
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