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This code has been written to make it easier to report visual angle in papers, and to ensure a standardized calculation is used. This code can take variable input (e.g. horizontal, vertical, or diagonal screen measurements in any units), and will calculate any number of degrees of visual angle in pixels, as well as degrees of visual angle spanned by the computer screen or an image. The code is provided on: http://saliency.mit.edu/ Two versions of the code are available for convenience: (1) computeDegVisAngle takes in a variable-length input argument list (2) computeDegVisAngle_gui is a simple user interface Usage and input parameters are specified in the respective functions. Example usage of (1): >> computeDegVisAngle('diagonal','19.5 inch','distance','24 inch','hres',1280,'vres',1024) Example usage of (2): >> computeDegVisAngle_gui NOTE: if you provide the screen diagonal and resolution, then the screen height and width will be estimated under the assumption that the aspect ratio of the screen dimensions matches that of the set resolution. If these estimates look wrong, either: (1) you measured the monitor dimensions, instead of the screen dimensions (2) the screen resolution aspect ratio does not match the screen dimensions (3) explicitely enter the screen height and width instead of the diagonal Common mistake: remember that the number of pixels per unit size of screen or image is a linear function, but number of pixels per degree of visual angle is NOT. Remember: when writing a paper, include enough information for visual angle to be calculated - providing screen resolution without screen dimensions or vice versa is insufficient! Also, remember to measure the screen itself, rather than the whole monitor. Zoya Bylinskii, Aug 2014 Resources used: http://osdoc.cogsci.nl/miscellaneous/visual-angle/, http://en.wikipedia.org/wiki/Visual_angle Thank you to Lavanya Sharan and Melissa Vo for helpful discussion.