Hi Jarvis and Nick,

I was just wondering how the change detection coding issue was resolved. I too am trying to program a change detection experiement and have run into some issues. I can get the images to cycle through on screen (img1, blank, img2, blank, img1, blank, img2, etc) but I cannot figure out how to get the cycle to stop when the participant makes a response (spacebar). Basically, I want the images to cycle through for 300ms each and stop cycling when the spacebar is stuck and record the time from the initial presentation of the first picture to the response. I know Jarvis recommended using an animation for this sequence but I was wondering if either of you had figured it out using just the aternating images. Any coding help would be greatly appreciated!