Monitor Calibration

You can read about the need for monitor calibration here: http://en.wikipedia.org/wiki/Gamma_correction

In the past (version PTB-2), Elizabeth Johnson and I have calibrated our stims with http://spyder.datacolor.com/product-mc.php (currently we use the "Pro" version). What we have done in the new lab with PTB-3 is just to calibrate the monitor using the Spyder system; we need to eventually check with a photometer that this is doing the job within the psychophysics toolbox (unknown as of right now).