Empirisoft Support

    Welcome to Empirisoft Support
Results 1 to 2 of 2

Thread: No response to key press in certain trials

  1. #1
    Join Date
    Oct 2008
    Posts
    2

    No response to key press in certain trials

    Hello,

    I am using DirectRT to create a sustained attention to response (SART) task. In the task, subjects must press the space bar when any number except 3 appears on the screen. When 3 appears, a "no response" is considered correct. Each stimulus stays on the screen for 250 ms. I have a 1125ms delay in between each stimulus.

    The problem is that sometimes the program does not advance on to the next stimulus in the sequence, even when a response is entered. However, at these times if you press the space bar a second time the program will advance. It seems like the initial space bar press doens't register at times. This will happen at different trials each time the program is run, and I can't figure out the reason.

    I have attached my input file.
    Attached Files Attached Files

  2. #2
    Join Date
    Oct 2008
    Posts
    2

    update

    I have been experimenting with the program more, and it seems that the issue is when subjects respond to the number stimulus quicker than around 200 ms. Is this something that can be fixed?

    Thank you.

Similar Threads

  1. Make video stop with a key press, record RT?
    By jwayand in forum MediaLab Older Versions: General Questions
    Replies: 2
    Last Post: 11-06-2009, 01:21 AM
  2. Dual-task paradigm with visual and auditory probes, spoken and key-press responses
    By quinnk in forum DirectRT Older Versions: General Questions
    Replies: 3
    Last Post: 09-29-2008, 01:10 PM
  3. Producing a beep upon key press after a given amount of time has occurred
    By bstewart in forum DirectRT Older Versions: How Do I...
    Replies: 3
    Last Post: 04-24-2008, 12:36 PM
  4. proceeding to next trial after some time or key press
    By Jonathan Berant in forum DirectRT Older Versions: How Do I...
    Replies: 1
    Last Post: 11-07-2007, 12:40 PM
  5. How do you either end a trial after a specified time or key press?
    By ack in forum DirectRT Older Versions: How Do I...
    Replies: 1
    Last Post: 08-14-2007, 01:57 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •