Hi,

I’m currently attempting to build a time estimation task using the builder but have run into a bit of difficulty. This is my first attempt at building an experiment in PsychoPy so apologies in advance if what I’m asking is extremely basic!

To give an overview of the task:

Participants will be trained to associate a circle “filling in” with the passing of time. I do this by showing them images of circle segments in black in quick succession e.g., 1/20 of the circle every 40ms. This part is straightforward.

My problem is that for the experimental phase of the task I want to show participants two events and for them to estimate the time between them by indicating how much of circle could have filled-in in the interval between the two events. Essentially, I want to show them event A, then event B and then present them with a circle on the screen (black outline, white fill) and ask them, “How much of the circle could have filled-in in the time between those two events”. I want them to be able to click on a part of the circle perimeter and for this to be shown as a proportion of the circle filled in in black.

From reading various forum posts I’ve gathered that what I should do is draw a circle (black outline on white background) and then track the location of the participants’ mouse on the perimeter of the circle by showing a black line from the center of the circle to the mouse position on the perimeter.

My questions are:

- is this possible to do in Builder?
- Is it possible to fill in the proportion of the circle between 0 degrees and their mouse location in black while leaving the fill of the rest of the circle in white?

Thanks in advance