Recording reaction time from the start of stimuli presentation.

JordiServerius

Hi,

My name is Jordi and I am currently programming my thesis experiments. Both will be conducted online.

The first experiment is an auditory lexical decision task and the second one a visual phoneme monitoring task. The main problem I've been having is that I'm unable to record the reaction times correctly.

Currently the reaction time is recorded using the "keyboard_responses"-item. But I would like for the reaction time to be recorded from stimuli onset i.e. the start of the audiofile (the same goes for the visual task).

Is this possible and if so how?

Thanks for all the help!

Fab

Hi @JordiServerius,

It is possible. The most typical way is to set the duration of the stimulus to 0ms and insert the keyboard object right after (this is demonstrated in the tutorials/documentation; if you haven't checked it out yet, I strongly recommend you do).

The other method, if for some reason the first was not adequate for your specific design, would be to do it programmatically, by accessing the time stamp of the events of interest (please check the documentation: https://osdoc.cogsci.nl/4.0/manual/variables/), calculate the RT manually and then save it into a variable. If you plane to run the task online, you'll need to do your programaming in Javascript.

Best,

Fabrice.