Edited sentence: (with on-line demonstration).Different spatial frequencies convey different information about the appearance of a stimulus.High spatial frequencies represent abrupt spatial changes in the image, such as edges, and generally correspond to configural information and fine detail.In layman's terms, this is the ratio of the crest-trough distance to the maximum thereof, which is twice the average.In the general population of adults, the threshold for spatial frequency discrimination is about 7%.In the study of visual perception, sinusoidal gratings are frequently used to probe the capabilities of the visual system.In these stimuli, spatial frequency is expressed as the number of cycles per degree of visual angle.It is often poorer in dyslexic individuals.Low spatial frequencies, on the other hand, represent global information about the shape, such as general orientation and proportions.One degree on the visual field represents four cycles on the wave pattern.There is an important quantitative concept related to spatial frequency, known as the Michelson equation, shown here:.de:Ortsfrequenz.fa:بسامد فضایی.ja:空間周波数.zh:空間頻率