Neural control and cognitive processes can be studied through eye movements. The VisualEyes software allows an operator to program stimuli on two computer screens independently using a simple, custom scripting language. The system can stimulate tandem eye movements (saccades and smooth pursuit) or opposing eye movements (vergence) or any combination.
Guo, Y., Kim, E. H., Alvarez, T. L. VisualEyes: A Modular Software System for Oculomotor Experimentation. J. Vis. Exp. (49), e2530, doi:10.3791/2530 (2011).