[open] compound stimulus

christophe

I am working on an experiment that uses a button composed of two images displayed side by side.
I have defined two image_button widgets and ideally, I would place them in the same widget column-row form. (But that does not work, only the last one is displayed).
Another approach would be to dynamically join the two images into a third one and use that one.
I was also wondering if OpenSesame supports the notion of group (multiple stimuli attached to the same "button"). I suppose I could implement this by attaching the same callback to multiple images.

Do you have any suggestions to implement this compound stimulus feature?

Thanks

Christophe

Edwin

Hi Christophe,

As it is now, the image_button only supports a single image at a time, I'm afraid. You could go for either of two approaches:

1) Merge the images. You could do this beforehand, but this would be feasible only if you have a limited number of possible image combinations. You could also merge the images online, but you would have to save the combined image as a (temporary) file for it to work with the image_button, so you will be making a lot of image files anyway.

2) Use two adjacent image_buttons, and give them the exact same response variable:

from libopensesame import widgets
form = widgets.form(self.experiment)
# The full path to the image needs to be provided.
# self.experiment.get_file() can be used to retrieve the full path
# to an image in the file pool.
image_button_1 = widgets.image_button(form, path=self.experiment.get_file('1.png'), var='response')
image_button_2 = widgets.image_button(form, path=self.experiment.get_file('2.png'), var='response')
form.set_widget(image_button_1, (0,0))
form.set_widget(image_button_2, (100,0))
form._exec()

Good luck!

Edwin