[solved] show sketchpad if keyboard response is not made during previous

elizabeth

Hello,

I am trying to set up an experiment so that a screen is shown with stimuli for 500ms and if no response is made, another screen with just a fixation dot is shown until they make a response. Currently, if a response is made during the stimuli, the fixation dot is shown requiring the subject to respond a second time. So, the sequence is: stimuli (500ms, set_response_period 'yes'), fixation (0ms, set_response_period 'yes'), keyboard_response (infinite)
Is there a way to specify that if a subject makes a response during the response period, the fixation sketchpad is skipped? Maybe by specifying run if [response]=none? (I tried this but it seems to then not move forward after 500ms for the stimuli).

I have looked through some older posts on this issue and it seems a bit complicated in those cases, however this seems fairly straight forward.

Thanks so much.

sebastiaan

Hi Elizabeth,

I think you're almost there, although I'm not entirely sure what your trial structure is at the moment (please post a screenshot if this response doesn't answer your question).

Specifying the following run-if statement for the fixation sketchpad ...

[response] = None

... should indeed prevent this sketchpad from being presented if a response has already been collected, provided that the response is collected in such a way that the response variable is set. But it sounds like your trial will always advance to a keyboard_response item, and wait for another response. Could that be it?

Cheers!
Sebastiaan

elizabeth

Hi Sebastiaan,

That is good that I am close : ) Yes, it always progresses to the keyboard_response item.

Here is a screen-shot, I am not sure if this helps...when I change the run if, it won't progress from the comparison sketchpad (where the stimuli is shown) until a response is made. I assume this is because the key_board response duration is set to infinite, but I want there to be unlimited time to answer, but only show the stimuli for 500ms.

elizabeth

Ok, actually I see what you mean about the response, I added another keyboard_response, used the run if statement and it is working perfectly!

Excellent program, it has made my life so much easier! Thank you.

sebastiaan

Great!