Tag: Critical Flicker Frequency

November 5, 2025 / Mohammed looti

CRITICAL FLICKER FREQUENCY (CFF)

Introduction and Definition The Critical Flicker Frequency (CFF) is a fundamental concept within the fields of psychophysics and visual science, representing a perceptual threshold that delineates the boundary between intermittent stimulation and continuous perception. Specifically, CFF is defined as the minimum rate, measured in Hertz (Hz), at which an intermittent or flickering light stimulus appears […]

October 20, 2025 / Mohammed looti

PORTER’S LAW

Porter’s Law (Ferry-Porter Law) Introduction and Core Definition Porter’s Law, frequently referred to as the Ferry-Porter Law, is a foundational principle within the field of Psychophysics that describes the temporal limits of human visual perception. In its most concise form, the law states that the frequency at which a flickering light source appears to become […]