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Thread: -1 Response in data file

  1. #1
    Join Date
    Jan 2007
    Posts
    10

    -1 Response in data file

    Hello again,

    Could anyone please tell me what does it mean when instead of getting a response in my data file related to the key I pressed (e.g.47) I get the value -1? I'm sure I'm pressing the correct keys, but I still get one of these every time I test the experiment.

    Thanks!

  2. #2
    Join Date
    Nov 2005
    Posts
    3,318
    Can you post a copy of your input file, or a simplified/reduced version that illustrates the problem?

  3. #3
    Join Date
    Jan 2007
    Posts
    10
    The -1 (plus a set RT of 501ms) in datafile happens when I add a ! at the end of the min-max values. If I take out the ! I get an accurate data file, however, I would like to be able to present my stimulus for only 500 ms regardless of when the subject responds.

    Attached is my input file partially modified.

    Thanks!
    Attached Files Attached Files

  4. #4
    Join Date
    Jan 2007
    Posts
    10
    I figured it out....I guess I didn't have to worry about the min-max values, all I needed was the clear500 command..duh...

    Thanks!

  5. #5
    Join Date
    Jan 2007
    Posts
    10
    Disregard previous post...It happened again.

    Attached is data file.

    Tahnks!
    Attached Files Attached Files

  6. #6
    Join Date
    Nov 2005
    Posts
    3,318
    Take a look at the response time on the first ten rows of the data file. See that it says -1 only for the trials on which your subject exceeded the maximum RT? If you are using a min-max value of 0-500! and you see an RT of 501, that means the subject did not respond within the first 500ms of the trial. Does that makse sense?

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