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Mjj1998 · Guest

Hi,

I'm creating a program with Delphi 7 that measures the reaction time
(RT) of a user when they click a mouse button after stimuli
presentation. The stimuli is presented on a form (full-screen) with a
TImage and TLabel visible. The correct response can be either the left
or right mouse button (depending on specfic cues presented before the
stimulus & picked randomly). This process is called a trial, and there
are many trials presented one after the other.

I am using the QueryPerformanceCounter method to measure the user's RT
for each trial (this seems to be the most accurate way to get
millisecond recording under WinXP - although I am aware that Windows
does occaisionally slice away to do other things, but this can't be
helped). What I need to do is record which mouse button was pressed,
but only during at a specific time. For each trial, 2 events can
happen:

1) If no button is pressed, the trial remains on the screen until 5
seconds has elapsed. The next trial then begins; or
2) If a mouse button is pressed, the trial ends and next trial begins
(after a slight delay).

At the end of each trial the mouse-click capture procedure should be
deactivated and only activated again when the next trial begins. The
mouse-click event isn't related to any object on the form (no object
needs to be "clicked" and eventually I want the mouse cursor to be
invisible during the trial) and it only needs to be active during a
certain time period (so I can't just use the OnMouseDown event handler
on the form itself).

I am having a lot of trouble trying to get this to work. My Delphi
training so far has been self-taught and I've been going fairly well,
but I'm hoping someone may be able to help me with this problem.

Thanks in advance!
~Mj

ATM Dude · Guest