Struggling to define acc for feedback

Comments

• lhs510

  June 2020

  From what I can see, the problem might be that var.acc source is a keyboard response, but I can't figure out why or how to change it to the correct mouse response.
• lhs510

  June 2020

  Ok, so now it just seems to reject the possibility of 'centre' being a correct response...
• lhs510

  June 2020 edited June 2020

  Apologies for continued updates. I have managed to change it to the mouse response and changed the inline script to:

  if var.target_visual == var.cursor_roi:
     var.correct_response = 1
  else:
     var.correct_response = 0
  

  While this does now calculate an accuracy score, the score is inaccurate (ironically). For example, if I get 3 out of 6 incorrect it sometimes reports 60% accuracy and other times 40% accuracy, depending on the order of the correct or incorrect answers.
• eduard

  June 2020

  Hey,

  I can't say for sure what the problem is, but you can simply create your own accuracy variable. All you need is a variable that counts the total number of trials, and one that counts the total number of correct responses. Divide one by the other et voila, you have your accuracy.

  # every time you want to reset your accuract, 
  # but at least once in the beginning of the experiment, 
  # initialize a variable for the total number of correct trials and trial count
  var.total_correct = 0
  var.total_trials = 0
  
  

  In a different inline_script:

  # update those counters based on the responses
  if var.target_visual == var.cursor_roi:
     var.correct_response = 1
     var.total_correct += 1 
  else:
     var.correct_response = 0
  var.total_trials +=1
  

  In a different inline_script:

  # compute accuracy
  var.accuracy = var.total_correct/var.total_trials
  
  # if you use Python 2, you should use float variables
  var.accuracy = float(var.total_correct)/var.total_trials
  

  Then you can use the variable var.accuracy, just like var.acc

  
  

  Hope this helps!

  Eduard