Mouse cursor pops up during sleep
I'm using OpenSesame to run a block design fMRI task--16 sec on and 16 sec off. With 800ms per trial, the "on" periods consist of 20 trials.
I already use the "time-to-pad" fix described here and achieve the "off" periods by adding 16000 ms to the time that experiment "should" be at.
This all works very well except that, occasionally, the mouse cursor will appear at the center of the display about 5-10 seconds into a rest period.
It never appears during the on periods, and disappears as soon as an off period finishes, so displaying a new canvas seems to "fix" it.
I was thinking of maybe having the rest periods consist of a series of fixation canvases (with fixation cross only) so that the image refreshes before the mouse cursor can appear, but at the same time I'm curious to understand why this might be happening. It doesn't happen every time, and closing all non-essential programs prior to running seems to help, so I'm wondering if its a memory issue?
The computer they have at the scanner for presenting stimuli is a bit old. It's a Dell Precision T3500, running Windows 7 with 4GB of RAM. I haven't tested the task out on many other computers, but I have only had the cursor issue while running on this Dell.
Thanks so much!