Programming a multi-character (correct) response

elisevt

Hi everyone,

I am programming my first OpenSesame experiment. The goal is a spelling bee task. My current trial sequence looks like this:

1) a word is presented through a sampler calling on a random word defined as [word] in the block loop

2) the answer_input_form is used to collect the participants answer

3) an inline script is written to compare the answer of the answer_input_form to the correct answer [word].

4) feedback is presented (correct/incorrect)

This set-up has some flaws: The answer_input_form cannot be timeout by the press of a butten (i.e. press enter when you have finished typing the word). Therefore, I have also tried this method: https://forum.cogsci.nl/discussion/31/solved-multi-character-keyboard-response-or-simultaneous-sketchpad-and-text-input but am unsure how to adapt the code to my situation.

Any help is appreciated, thanks in advance!

Fab

Hi @elisevt,

Here's a hybrid solution using code inspired from that you found.

It kind of works, with one limitation: it is not possible to enforce a strict timeout on the keyboard object using that method. This is because the keyboard call awaits a response before executring any other code, and so the timeout condition cannot be assessed until after a key has been pressed. This means that if you wanted to enforce a time limit of, say, 5000 ms, the response taking would not be interrupted until the first key being pressed after that 5000 ms interval. I searched for a solution to this but I don't think one exists (through I'm no Python expert; perhaps @eduard knows of a way around it).

Other than that, I attach a demo task that does most of what you require: presents words in random order, takes multiple key presses (handles back spaces, special characters), kind of limits the response time window, and scores the response and provides feedback. Hopefully you can modify it and adapt it to your needs.

I included notes throughout the code inside the task so that you can see what each bit does.

The general logic is to encapsulate the registration of multiple key presses with it s own loop, nested within the loop controlling the trial. That way, we can interrupt the registration of responses when the subject presses "ENTER" or when the last response registered comes later than the maximim allowed time (not that I coded this as the "time_limit" variable inside the "words_list" loop, so that it could be set differently for different trial if you wanted to).

Please also note the use of the break it function in the loop tasked with registering key presses:

Here's my version of the task:

MultipleCharInput.osexp

Hope this helps,

Fabrice.

elisevt

Hi Fabrice,

Thanks so much, the experiment is running now!

Elise

Fab

Hi @elisevt,

Glad I could help! Good luck with your experiment!

Cheers,

Fabrice.