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Disturbances of rod threshold forced by briefly exposed luminous lines, edges, disks and annuli

1. When the dark‐adapted eye is exposed to a brief duration (2 msec) luminous line the resulting threshold disturbance is much sharper (decay constant of ca. 10 min arc) than would be expected in a system which is known to integrate the effects of light quanta over a distance of 1 deg or so.