Feedback for answers in the wrong order doesn't work: '<' not supported between instances of 'float' and 'list'

[hellopsych]

Hello! I’m trying to create a dual task experiment with the following feedbacks:

1. ‘Too slow’ when no answer is given
2. ‘Correct’ when both answers are correct and in the right order
3. ‘Wrong’ when a wrong answer is given
4. ‘Wrong order’ when task 2 is answered before task 1

I had no problem with programming feedback 1) to 3). But when I wanted to consider the order of the answers too everything went wrong.

This code is what I’m currently trying to work with:

if key_resp_t2.rt < key_resp_t1.rt:
    msg = 'Wrong order'
elif key_resp_t1.keys == None or key_resp_t2.keys == None:
    msg = 'Too slow'
elif key_resp_t1.corr and key_resp_t2.corr:
    msg = 'Right'        
else:
    msg = 'Wrong'

My error message is: TypeError: '<' not supported between instances of 'float' and 'list'

I only store the last key for each of both keyboard components (key_resp_t1 and key_resp_t2). I placed the code at ‘Begin routine’.

Any ideas of what I did wrong?

Thank you!

[JensBoelte]

Hello hellopsych

AFAIK, you can’t or you shouldn’t have two keyboard-components in one routine.

Using conditional key responses

The error tells you what is going wrong: you are referring to a keyboard object called resp and then trying to access an attribute of it called .a. But keyboard objects don’t have an attribute with that name, so an error occurs. Instead, the key that was pressed is stored in an attribute called .keys (even though it contains just one keypress in this case). So as above, you need to use code like this: Now I’m not sure what your_keyboard_component_name should be: in your screenshot shown above,…

You could use one keyboard-component, check whether two keypresses have taken place, end the routine, and finally check for the proper order of the answers and the number of responses given.

See here for a similar problem

Ending Trial after Two Key Responses

Hello Woon ok, the problem is that you compare resp.keys to the strings corrAns1 and corrAns2. resp.keys is however s, right, down, up, left or right. I used just ‘1’ and ‘2’ as an example. You need to change the if-else construction to if resp.keys == [str(corrAns1), str(corrAns2)] or resp.keys == [str(corrAns2), str(corrAns1)]: resp.corr = 1 else: resp.corr = 0 Best wishes Jens

Best wishes Jens

[hellopsych]

Hello everbody. I think I solved the problem:

• First of all, I changed my settings so that I store all of the entered keyboard responses and not just the last one. I still don’t know why my original code didn’t work. Weird. I would still appreciate suggestions about why this happened.
• Now I get a list with keyboard inputs (that is where the len is). I have to change my code so that there will be also a feedback when too many keys are pressed (otherwise the participants could just press every key all the time to get the right answer)
• For the right or wrong order I compared the last entered key (that’s where the [-1] is)

if ( \
        key_resp_t1.keys is None \
        and len(key_resp_t2.rt) > 0
    ) or ( \
        len(key_resp_t1.rt) > 0 \
        and len(key_resp_t2.rt) > 0 \
        and key_resp_t2.rt[-1] < key_resp_t1.rt[-1] \
    ):
    msg = 'Wrong order'
elif key_resp_t1.keys is None \
    or key_resp_t2.keys is None:
    msg = 'Too slow'
elif len(key_resp_t1.keys) > 1 \
    or len(key_resp_t2.keys) > 1:
    msg = 'Too many keys were pressed'
elif key_resp_t1.keys == [t1_resp_corr] \
    and key_resp_t2.keys == [t2_resp_corr]:
    msg = 'Right'
else:
    msg = 'Wrong'

[hellopsych]

Thanks for letting me know. After spending literal hours on my code I could make it work with two keyboard components. However, this was such a pita. I will restart the project and try to program it with just one keyboard component. After all, this was just an exercise to learn PsychoPy and I want to learn it the right way and not the wrong and complicated way.