Discussion of imalsogreg's comment: "To best approximate physiological patterns of striatal activity, we used a constant illumination paradigm to avoid imposing patterned firing on stimulated neurons." This is a very strange thing to say! Stimuli are 100ms and 1s long - sharp onset, sharp offset, with a fiber-optic shaped activation spot. Patterned firing is certainly being imposed, physiological patterns are not well approximated.