[solved] Use response time to set fixation duration

Comments

• sebastiaan

  October 2013 edited 11:45PM

  The reason that you cannot use [response_time] as a duration for a sketchpad in your case is because the duration is already prepared before the response has been collected. This is related to the distinction between the prepare and the run phase:

  • http://osdoc.cogsci.nl/usage/prepare-run/

  And at any rate, you want a duration of 4000 - [response_time], right? So using [response_time] for the duration wouldn't result in the expected behavior anyway.

  The easiest trick to pad the response time is probably to insert a simple inline_script after the keyboard_response. The following code waits for 4000 ms minus the previously collected response time. (You need to put this code in the run phase of the inline_script.)

  self.sleep(4000-self.get('response_time'))
  

  You can also take a look at this discussion about non-slip timing:

  • http://forum.cogsci.nl/discussion/298

  Hope this helps!
  Sebastiaan

  
  
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• Papi

  October 2013 edited October 2013

  This was what I wanted, thank you!
  But I realized that I now have another question: What happens if no reaction is shown? The keyboard response is set to time out after 1700ms. So I would like the 'response_time' in the self.sleep function to be replaced by this 1700ms if no reaction is shown. How can this be done? Or is this automatically the case?
• sebastiaan

  October 2013 edited 11:45PM

  When a timeout occurs, response_time is set to the timeout value and response is set to 'None'. So in your case I think timeouts should work exactly as you want!

  
  
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• Papi

  October 2013 edited 11:45PM

  Perfect, thanks again!