End Loop based on the percentage of correct responses

Builder
1

OS : Win10
PsychoPy version :2020.2.5
Standard Standalone? Yes
What are you trying to achieve?:
To end a loop based on the percentage of correct responses after some trials.

It’s my first time with psychopy and I know if i use this code the routine stops after 3 correct responses:

score+=key_resp_2.corr
thisExp.addData(‘Score’,score)
if score >= 3:
trial.finished = True

But I don’t know how to code to end the loop with 95% correct responses of at least 25 trials.

Thanks!

2

The code you have adds 1 to score if a correct response is given, to continuously work out an average I would recommend instead appending 1 to score. So rather than:

score = 0
score += key_resp_2.corr

you would do

score = []
score.append(key_resp_2.corr)

what this means is that score becomes a list of 1s and 0s, which you can then work out an average for and compare this average to 0.95 (which it will be if it’s 95% correct):

if average(score) >= 0.95:
    trial.finished = True

A word of caution: You might want to start off with a few 0s in score rather than have it blank, otherwise they will get one correct answer and the task will finish because their correct % will be 100%. Either that or don’t calculate average until a few repetitions in.

1 Like
3

Thanks! I tried and it works perfectly.

Also, I solved the problem of the posible and unexpected finish of the experiment with just one correct answer adding a minimun of correct answers required. Before experiment:

score =
scorr = 0

End Routine:
score.append(key_resp_2.corr)
scorr+=key_resp_2.corr
thisExp.addData(‘Score’,score)
if (average(score) >= 0.95 and scorr >= 10):
trial.finished = True

Thanks!