Show trial number on the screen

Coding
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1

Hello,

I’m very new in Psychopy and I have a question.

I’m running Psychopy v2021.1.2. on Windows. I have created an AX discrimination test but I don’t know how to make the trial number appear on the screen.

Please give me detailed information on how to do it

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Many thanks,

George

2

Hi George,

add a text component to the routine where you want the trial number to appear. Then in the Text field add:

$main_trial.thisN and set the field to “set every repeat”

Note that main_trial refers to the name of the loop you are currently in, so if you were in your practice loop you would use $practice_trial.thisN

Hope this helps,
Becca

3

Hi Becca,

Thank you for your response!

This seems to work, however, I would like to add current trial out of total trials (e.g., 2/30)

I used $main_trial.thisN+1+ "/ " + $main_trial.nTotal
and $str(main_trial.thisN+1) + " / " + $str(main_trial.nTotal) but these seem not work.

Any ideas would be much appreciated!

George

4

very close! you only ever need one dollar sign (at the start of the field to indicate this will be python code

try

$str(main_trial.thisN+1) + " / " + str(main_trial.nTotal)
5

Many many thanks! That works perfect locally. I hope it works online too!

6

What if I wanted to add text around this, to say “You are now X/X trials through the experiment”? How could I do that?

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$"You are now " + str(main_trial.thisN+1) + " / " + str(main_trial.nTotal) + " trials through the experiment"
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