Display timing in online experiments

JasperdeWaard

Hello hello people,

If I'm being particular about the timing of stimuli on a display, in OpenSesame I would use:

time1 = canvas1.show()
time2 = canvas2.show()
canvas1_time = time2-time1

Is there a (reliable) alternative to this method for online experiments?

All the best, and merry Christmas,

Jasper

sebastiaan

Hi @JasperdeWaard ,

Although you cannot use Canvas objects in OSWeb, you can do much the same thing with sketchpad items, which set their onset time as a variable called time_[item name]. So say that you want to get the duration of sketchpad1 (which is followed by sketchpad2), then you could do the following in an inline_javascript item:

console.log(vars.time_sketchpad2 -  vars.time_sketchpad1)

See also:

• https://osdoc.cogsci.nl/3.3/manual/variables/#item-variables

— Sebastiaan

JasperdeWaard

Aha, that makes sense. Thanks a lot Sebastiaan!