The Psychophysics Toolbox.

@article{Brainard1997ThePT,
  title={The Psychophysics Toolbox.},
  author={David H. Brainard},
  journal={Spatial vision},
  year={1997},
  volume={10 4},
  pages={
          433-6
        }
}
The Psychophysics Toolbox is a software package that supports visual psychophysics. Its routines provide an interface between a high-level interpreted language (MATLAB on the Macintosh) and the video display hardware. A set of example programs is included with the Toolbox distribution. 

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A program for MATLAB is presented that generates and presents theheterochromatic fusion nystagmus stimulus, a reflexive nature of the subject’s response that allows assessment of isoluminant states through recordings of reflexive eye movements.
...

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