Differential feedback depending on the participant's response

Comments

• eduard

  August 2016

  Hi Marija,

  You could add 2 sketchpads to your sequence, one for each type of error. So, in that sketchpad you present the images, either image_error_1 or image_error_2. Next, in the tab of the sequence you can set these sketchpads to run only if a type 1 error or type 2 error occurred, respectively (in the run if field: [response] = [error1]`).

  If you want to do this with inline_scripts it works a little differently. it won't be very hard, but I don't really understand how your sequences are structured, so that I can't really help you there yet. Anyway, the sketchpad solution should be working just fine.

  Let me know if you need more help.

  Eduard

  
• pogonophile

  August 2016 edited August 2016

  Yes, that solved the problem. Unfortunately, partially - when the participant makes a mistake, I need it to get back on the same stimuli, not to continue.
  I tried to put a condition on the sequence of images "rep slike" run if [response] = [correct_response], but then I have another kind of problem - how to run the first image.

  Look at the variables I attached: (I also attached a few images, just for you too see how the experiment looks like).

  1Z is start position image. Correct response is 8 (it was up, but I changed it, see below). Incorrect are 4 (left) and 6 (right). I can't write the previously mentioned run if, because than it won't start, and if I delete the condition, than after the feedback, the experiment runs the next image in the sequence, i.e. draws the path on itself.

  Another thing - not sure if it's because my experiment doesn't work properly, but something's wrong with keyboard response. I allowed all the arrows (LEFT;RIGHT; etc, right? I checked allowed responses, it should be it), but te experiment does not react to keypresses properly, it reacts only when I press two times - tried it also with numbers.

  Course, I should think about it more myself tomorrow, but if you have any idea that jumps into your mind quickly, it would be appreciated.

  Thanks!
  
  
  
  
• pogonophile

  August 2016

  What I actually need is a condition not to show the next picture unless correct response is given, with the exception of the first one.

  Could I place the condition in the sequence tab (run if), or I have to edit the script?
• pogonophile

  August 2016

  Ok, now I'm definitely stuck - even the feedback the way you said me to put it doesn't work. Duration for the "rep_slike" is 0 (solves the double press problem), for the feedbacks is 200 ms, and when I run it, it just shows the images from the rep_slike (variable zel_ul_repr) on any keypress, both correct and incorrect.
  I just can't find the mistake.
  Maybe somewhere in the sequence? Should I try to place the feedback variables out of the sequence?

  
• eduard

  August 2016

  Hi,

  Would you mind uploading the experiment, so that I could have a closer look? Your intuition sounds actually pretty good. Proceeding with the next image, only if the previous response was correct should be the best way to tackle the problem. Unfortunately, quite a few things can go wrong making this work. If I could play around with your experiment, I might be able to fix it.

  Thanks,

  eduard

  
• pogonophile

  August 2016

  Here it is.
  Thank you very much for the effort!
• eduard

  August 2016

  Hi,

  I think the reason why the feedback doesn't work is either due to a type conflict, or an upper/lowercase conflict. What are the correct responses currently? 2,4,6,8 or UP, LEFT, RIGHT, DOWN? If you use the numbers, they are probably stored as integers in the loop table, but as strings when you press the keys. So in order to check whether a response was correct, you have to convert one of them to the type of the other, e.g. in the loop table, you can not put 2,4,6,8 as correct responses, but '2','4','6','8'.

  If you use UP, LEFT; RIGHT and DOWN, you have be aware that 'down' != 'DOWN', a response is collected as 'down', so in the loop table you should also use this one.

  Finally, your main issue, I think what you could do to only proceed with the route when the correct answer was given, is to add an inline_script to the end of your last sequence and add this code in the run phase:

  items.execute('rep_zelena')
  

  This inline_script should only be run if a incorrect response was given, so in the run if field, you have to add both conditions of the error images, connected with an or (as either one or the other has to be true, to trigger the trial to be repeated).

  Does this make sense?

  Eduard

  
• pogonophile

  August 2016

  Yes, it was the upper/lower case conflict - I just thought because you can specify the left arrow in allowed response both ways ('left' and 'LEFT'), it would be the same in the loop variables.

  Thank you very much! It works!

  Best,
  Marija