[R] using R for a reaction-time experiment

[Seth Roberts]

I want to use R to run a reaction-time experiment: Something appears on the
screen, I respond by typing something (one keystroke), the system measures
the speed of my response. R would be great for this if only I didn't have to
hit Enter to enter that keystroke. I am doing such experiments now but they
require two actions per trial: hit keystroke, hit Enter.

Is there some way that R can be made to respond to a single keystroke (other
than Enter)?
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