critical fusion frequency
frequency, critical fusion (CFF)
Frequency of a light stimulation at which it becomes perceived as a stable and continuous sensation. That frequency depends upon various factors: luminance, colour, contrast, retinal eccentricity, etc. Syn. critical flicker frequency. See Brücke-Bartley effect; flicker; Ferry-Porter law; Granit-Harper law; Talbot-Plateau law; flicker photometer.