timing question

[Amy Eschman]

Dear Myeong-Ho.

This can be accomplished using a Label object, and the "Jump" option for
the End Action field in the object collecting input.  You should set the
Duration for the object collecting the input to 1000 ms, with the Time
Limit set to the maximum amount of time you want to allow for a
response, and the End Action set to "Jump."  Then, you will need to
create a second object (i.e., a blank TextDisplay) to clear the stimulus
from the screen after the 1000 msec has expired and allow additional
time for a response.  This blank TextDisplay does not enable input, you
simply need to specify a Duration for it to wait for a response.
Finally, place a Label object in the Procedure immediately following the
blank TextDisplay.  The name of the Label object is entered into the
Jump Label field for the object collecting input.   Using the "Jump" End
Action in combination with the Label object will allow you to present
the blank TextDisplay if and only if no response comes in during the
display of the stimulus, and to terminate the display of the stimulus
upon response.

There is an example of this implementation in the Download/Samples area
at the E-Prime support site (www.pstnet.com/e-prime/support).  The
sample (Clear Stimulus-Leave More Time for Response) illustrates two
methods.  One clears the stimulus upon response, and the other maintains
the display duration of the stimulus (e.g., displays the stimulus for
1000 msec regardless of when the response came in).  You will need to
upgrade to v1.0 to view this sample.

I hope this is helpful.

Amy Eschman
Manager, Technical Support
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-----Original Message-----
From: Myeong-Ho Sohn [mailto:mhsohn at andrew.cmu.edu]
Sent: Monday, March 04, 2002 5:37 PM
To: eprime at mail.talkbank.org
Subject: timing question


Dear E-Prime users:

I have a question that everybody I talked to thought was pretty easy to
solve but none of them actually has the solution.  So, I decided to post
here.

Here's what I want.

I like to present a stimulus, let's say at most for 1000 ms.
If a response is made before 1000 ms, the stimulus disappears as soon as
the
response is made.
If a response is not made before 1000 ms, the stimulus disappears anyway
at
1000 ms, and the program waits until the response is made.

I played with several options in the duration/input properties, but I
don't
seem to be able to find the right combination.

This is a very basic problem so there's got to be an easy way to do this
but
I just can not figure out.

If anybody knows a way to solve this, that'd be great.
By the way, I am using Beta 5.0 if that matters.

Thanks.

mh