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In article <47g9fh$oaa@nsi.is.titech.ac.jp>
kasiwagi@is.titech.ac.jp (Shin-ichiro Kasiwagi) writes:

  > In article <email-0411951245010001@yoshi2-eee.eng.kagoshima-u.ac.jp> email@domain.com (=?ISO-2022-JP?B?GyRCNUhMbjknGyhC?=) writes:

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-----------------------------------------------------------------------------
6.1.2  I'm writing a psychology experiment.  How can I get millisecond timing
       from the keyboard (or mouse)?
-----------------------------------------------------------------------------

The simple answer is that you can't.  Although the new time manager can call
routines every couple of microseconds, input goes through the event manager,
which only posts events about every 16 milliseconds.  Thus, even if you poll
the keyboard every 30 microseconds, you will not get better than 16 ms.
resolution.  If you really need millisecond accuracy, you need to use
external hardware.

The good news is that you probably don't need better than 16 ms. resolution
anyway.  Measuring with 16 ms. accuracy only increases the standard deviation
of your RT means by about 4.8 msec.  Read: Ulrich, R. and Giray, M. (1989).
Time resolution of clocks: Effects on reaction time measurement -- Good news
for bad clocks.  British Journal of Mathematical and Statistical Psychology,
42, 1-12.

By the way, there is a mailing list dedicated to running psychology
experiments on the Mac.  It frequently gets tied up in arguments about
millisecond timing.  The address to write to is macpsych-request@stolaf.edu.

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----- $@9-EgBg3X(J  $@Am9g2J3XIt(J  $@6yC+9'MN(J (sumi@cuby.mis.hiroshima-u.ac.jp)