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Thread: No response as correct response

  1. #1
    Join Date
    Jan 2007
    Posts
    10

    No response as correct response

    Hello,

    I'm trying to design a go/no-go type task and for the practice session I would like to provide the participant with feedback. During go trials, I know how to provide feedback with the word "Correct" as described in the manual. However, I can't figure out how to let the program know that during no-go trials no response is actually the correct response.

    Any help is appreciated!

    -Maria

  2. #2
    Join Date
    Mar 2009
    Posts
    401
    Hi Maria - In order to describe a null response as valid, you will want to use the response time value of ' -1 ' . Using -1 tells the software that you want to denote 'no response' as the correct response.

    Here's an excerpt from the manual:
    "An alternative to using the ! symbol is to define -1 as a valid response code on your trial. That way, only trials on which -1 is given as an option will continue automatically after the maximum time has been reached. Like other codes, if -1 is listed first, then it will be considered the correct response. This option can also be combined with the ! method if you want to define no response as correct but have automatic continuation regardless of the response. You can think of -1 as an actual "no response" button which is pressed at the maximum response time."
    This text was taken from the following link: http://www.empirisoft.com/directrt/h..._rt_limits.htm

    You may also want to look into the GNAT sample provided with the software in the 'Samples' folder. More information on this sample can be found here: http://www.empirisoft.com/directrt/h...e_as_valid.htm

    Please let me know if you have any additional questions or if I can help in any way.

  3. #3
    Join Date
    Jan 2007
    Posts
    10
    Thank you very much!

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