Response time when using sound stimuli

Comments

• Fab

  May 2023

  Hi @hwon,

  I'm not sure I understand your question. If you want to measure a response time for a mouse click after a sound has played, you simply need to set the duration of the sampler to the sound's duration and place the mouse response object just after the sampler. Then you simply use the response_time variable.

  I attach a basic example.

  mouse click after sound.osexp

  Note that if you wanted to measure the RT form the sound's onset (instead of offset), you'd simply have to set the duration of the sampler to 0.

  Hope this helps,

  Fabrice.

  
• hwon

  May 2023

  
  

  Hi, @Fab ,

  Thank you for your kind reply.

  I would like to correct something in the previous question that was not specific.

  The experiment I'm designing involves listening to a sound stimulus(using a sampler) and pressing a button that corresponds to an answer to a question(using a form base with buttons).

  In other words, it seems to be accurate to say that it is a button click(with a mouse), not a mouse click.

  In this case, there is no 'response_time_mouse_response' variable in the log file.

  There are 'time_Buttons', 'time_Logger', and 'time_PlaySound' in the log file.

  'time_Buttons' seems to be the time the button was pressed.

  But I'm not sure what 'time_Logger' and 'time_PlaySound' mean.

  If you know the answer to this question, please let me know.

  Sorry to bother you with additional questions.
• Fab

  May 2023

  Hi @hwon,

  Thanks for clarifying your question.

  To asnwer you question, the "time_" variables correspond to the time stamp for different objects (see https://osdoc.cogsci.nl/3.3/manual/variables/#experiment-variables). You can think of it as the time on an internal clock (the time it was when such or such object was shown or run). The form_base object does not come with an automatic response_time variable because by definition this type of form allows experimenters to display anything, but you can calculate the response time manually using some code, calculating the time difference between the time stamp of that code (time_calculate_RT, if we imagine that your inline_python object is called calculate_RT) and the time stamp of the form (time_formA, if we imagine that your form is called formA). Here's a demo playing a sound and then taking a response frmo a form where participant has to click on one of two buttons.

  button click after sound.osexp

  Hope this helps,

  Fabrice.

  
• hwon

  June 2023

  Dear @Fab,

  I really appreciate your kind and detailed explanation.

  Your explanation gave me a good understanding of how time works.

  Thank you so much for the demo file too!