[solved] button click timestamp

jarich

Hi everyone,

does Open Sesame provide a function to return the timestamp of a button click without using an inline script? (the response form has two buttons, so a decision has to be made and I would like to retrieve the response time)
Some ideas I already had which didn't work:
(a) insert mouse_response after form with buttons --> form waits for a button click and mouse_response waits for mouse button click --> you have to click two times and it's not an accurate reaction time then
(b) as described above but set only_render to 'no' --> you don't know which of the two buttons was clicked and you can click anywhere you like

Thanks in adavance for any more ideas that work

Jasmin

Josh

Hi Jasmin,

I don't know if you have an actual inline_script aversion, but even if you do, I'm still going to suggest a very simple and minimalistic inline_script implementation.

1) Right before the response form, you insert one of those bad boys, with one line of code added in the run phase: start_time = self.time()

2) Right after the response form, you insert another one of those bad boys, with one line of code added in the run phase: exp.set('response_time', self.time()-start_time)

And there you go: a response time!

Cheers,

Josh

jarich

Hi Josh, thank you for your help, this is a very convenient way to do it. And no, I have no particular aversion for inline scripts it's just that I had huge problems with timing (which was quite unhandy since I need to collect reaction times) and had the impression that running different forms, scripts etc. are making timestamps inaccurate. But I will try out your solution and check the timestamps.

Cheers,

Jasmin

eduard

Hi Jasmin,

If you keep some general points in mind, there is no reason why you shouldn't get ms-precision timing. Checkout this page of the documentation. There Sebastiaan explains quite detailed how a optimal timing is obtained with OpenSesame.

Good luck with your experiment.

Eduard

Josh

Hi Jasmin, one more thing though: the lines of code should be in the run-phase rather than the prepare-phase. (All prepare-phases are run before anything else, meaning it would create the response time variable before the form. I edited my mistake in the original post; apologies!

Josh