Diphasic and Polyphasic Temporal Modulations Multiply Apparent Spatial Frequency
Diphasic and Polyphasic Temporal Modulations Multiply Apparent Spatial Frequency is a scholarly work, published in 1974 in ''Perception''. The main subjects of the publication include optics, physics, flicker fusion threshold, brightness, overtone, flicker, spatial frequency, illuminance, grating, and visual perception. The authors found that through high-frequency polyphasic flicker the spatial effect that Kelly mentions can be generalised to spatial frequency multiplication: polyphasic flicker produces not only the apparent second harmonic but also the third and the fourth harmonic, depending on the phase parameters.