[solved] Using "soundrecording" to control the duration of a sketchpad object

Comments

• sebastiaan

  October 2015 edited 11:50AM

  Hi Tali,

  The sound recorder plug-in only records sound, but doesn't allow you to do anything sound-contingent. However, it's quite easy to implement a vocal key with a simple inline script. There quite a few examples floating around on the forum (search for "voicekey"). For example:

  • http://forum.cogsci.nl/index.php?p=/discussion/comment/92#Comment_92

  Cheers!
  Sebastiaan

  
  
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• labovich

  October 2015 edited 11:50AM

  Hi Sebastiaan

  Thanks for the response!

  I looked at the discussion you sent, and I noticed that there were issues
  with how accurate response times are (from the onset of the picture to the first sound participants make). This can be problematic for me, because I use several computers for my experiment.

  I apologize, maybe I'm missing something, but these RT problems
  are because you also try to record sound? in this case it shouldn't be a problem if I don't want to record any sound.

  Is there a way to modify the voice key code so it:
  1. Only capture response time without recording
  2. Allow participants to respond in more than one sketchpad? (like what the "parallel" plugin is doing?)

  Thanks again!
  Tali =:)
• sebastiaan

  October 2015 edited 11:50AM

  I apologize, maybe I'm missing something, but these RT problems are because you also try to record sound? in this case it shouldn't be a problem if I don't want to record any sound.

  No, the main source of latency is the sound card/ drivers itself, and this doesn't depend on how you process the sound when it comes in. If you're concerned about the timing, it's best to benchmark your system. For example, you can show a picture and play a sound at the same time, and then use this sound to trigger the voicekey. This way you can get an idea of the temporal variability of the voicekey. Does that make sense?

  Is there a way to modify the voice key code so it: 1. Only capture response time without recording

  Yes, there is an example of that at the top of the same discussion ;-)

  2. Allow participants to respond in more than one sketchpad? (like what the "parallel" plugin is doing?)

  I'm not sure what you mean exactly. You can simply repeat the voicekey script after several sketchpads, just like you could with a keyboard_response. Or is that not what you have in mind?

  
  
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• labovich

  October 2015 edited 11:50AM

  Thanks Sebastiaan!

  That's a great idea to test my system! I'll do that!

  About the multiple responses - I didn't explain myself well.
  The experiment goes like this:
  -slide 1: picture (300 ms)
  -slide 2: Slide saying "how many?" that should disappear once
  participants responded.

  Is it possible to get a single measure of RT if participants
  responded during the first or the second slide?
• eduard

  October 2015 edited 11:50AM

  Maybe not very elegant, but you could always calculate reaction times yourself by taking the time at the beginning of the period to be measured and at the end. Just add an inline_script at the respective position in the sequence, take the time (t0/t1 = self.time) and take the difference as estimate of your reaction time. Does this help?

  Eduard

  
• labovich

  October 2015 edited 11:50AM

  Hi Eduard

  Yes! Thank you very much!!