Pausing and Resuming during a procedure

[Matt Conroy]

  I am creating an experiment that requires subjects to orally identify
visual stimuli, which are presented sequentially.
  I want to make a subject input that can pause the stimulus presentation
(during which the current stimulus remains on the screen indefinitely) and a
second input that causes the stimulus presentation to resume normally.
  It is important to record the time of these inputs, or the stimulus during
which they occurred.

  Thank you for any advice.

Matt Conroy
Graduate Student
UC San Diego Psychology Dept
mconroy at ucsd.edu