Code to gradually reveal pictures from random uniform visual white noise. Image contrast (and thus signal-to-noise) increases linearly over time causing the image to gradually appear out of the noise.
The code to generate the UMCG Noise movies was developed in 2008 by Frans W. Cornelissen from the Laboratory of Experimental Ophthalmology of the UMCG and subsequently used in a study by Anne-Marthe Mepplink et al. described in:
Meppelink A, De Jong B, Renken R, Leenders K, Cornelissen F, Van Laar T. Impaired visual processing preceding image recognition in Parkinson’s disease patients with visual hallucinations. Brain (2009) pp. 1-14. http://dx.doi.org/10.1093/brain/awp223
When using the code, it would be appropriate to also acknowledge the use of the Psychtoolbox by citing these papers:
Brainard, D. H. (1997) The Psychophysics Toolbox, Spatial Vision 10:433-436. Pelli, D. G. (1997) The VideoToolbox software for visual psychophysics: Transforming numbers into movies, Spatial Vision 10:437-442.
Kleiner M, Brainard D, Pelli D, 2007, “What’s new in Psychtoolbox-3?” Perception 36 ECVP Abstract Supplement.
Download the code [here].
Info: f.w.cornelissen@umcg.nl