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-1 Response in data file

  1. 05-29-2008, 11:57 PM#1
    mbeatriz

    -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. 06-10-2008, 3:06 PM#2
    jarvis24 Blair Jarvis, Administrator
    Can you post a copy of your input file, or a simplified/reduced version that illustrates the problem?
  3. 06-11-2008, 1:51 PM#3
    mbeatriz
    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!
  4. 06-11-2008, 2:52 PM#4
    mbeatriz
    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. 06-12-2008, 3:29 PM#5
    mbeatriz
    Disregard previous post...It happened again.

    Attached is data file.

    Tahnks!
  6. 06-13-2008, 2:57 PM#6
    jarvis24 Blair Jarvis, Administrator
    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?