Jim Lemon wrote:
Johnathan Williams wrote:
Would anyone be so kind as to write a routine to time
mouse button presses in R to the nearest millisecond?
If R had a timer of this kind and a few basic screen
handling routines (to write characters or graphics of
different sizes and colours at precise times) then it
would make it easy to use it for on-line data analysis
of data to control EEG experiments.
I do this under DOS for a battery of human performance tests. However, it
requires taking over the system clock _and_ the keyboard interrupt to time
keypresses to the nearest millisecond (and you can get a bit more than
that if you want). If anyone knows about how to do this under Linux, I
would love to port these tests over.
Jim
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You can use (for example) RGtk library (from Omegahat). Then compose
some sort of test pad where user would click buttons. Gdk events have a
field "time" (in milliseconds) and all you have to do is to attach
callback for specific X-events.
Sample R callback (to intercept mouse button clicks):
mouse.button.hit<-function(win, arg) {
MouseButtonPressTime<<-as.numeric(gdkEventButtonGetTime(arg))
}
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