armchair neuroscience

[gusl]

Conjectures: (a) the temporal resolution of human vision is determined by the refractory period of sensory neurons (b) this is the mechanism by which alcohol slows down one's reflexes.

Alex Sweet (1951) p.198:

<< At the fovea, for either the light- or dark-adapted eye, the just noticeable interval of time between two adjacent flashes was approximately 5m.sec >>

i.e. if you're going to have a flickering light, the flicker will tend to be noticeable if the frequency is lower than 200Hz.