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lüll Classification images: A review Murray RFJ Vis 2011[May]; 11 (5): äClassification images have recently become a widely used tool in visual psychophysics. Here, I review the development of classification image methods over the past fifteen years. I provide some historical background, describing how classification images and related methods grew out of established statistical and mathematical frameworks and became common tools for studying biological systems. I describe key developments in classification image methods: use of optimal weighted sums based on the linear observer model, formulation of classification images in terms of the generalized linear model, development of statistical tests, use of priors to reduce dimensionality, methods for experiments with more than two response alternatives, a variant using multiplicative noise, and related methods for examining nonlinearities in visual processing, including second-order Volterra kernels and principal component analysis. I conclude with a selective review of how classification image methods have led to substantive findings in three representative areas of vision research, namely, spatial vision, perceptual organization, and visual search.|*Models, Neurological[MESH]|Humans[MESH]|Photic Stimulation/*methods[MESH]|Psychophysics/*methods[MESH]|Space Perception/*physiology[MESH]|Visual Fields/*physiology[MESH] |