A demo of the experiment can be viewed [here](http://simonslab.com/game/xcol_demo.html). The procedure for this experiment is identical to that of [previous](https://osf.io/5p7da/) [experiments](https://osf.io/9wmnx/) except for two minor changes. The gameplay is identical to that of prior experiments; however, the number of required crossings was reduced to 8 from 10. The median time to complete the game in the prior experiment was roughly 4.5 minutes. In order to maintain a fair pay rate for the task, the gameplay portion was shortened. The unexpected object now spawns randomly on the 5th or 6th of 8 crossings. The other change is to the appearance of the unexpected object. The spawn behavior and movement is identical to the previous experiment. In this experiment, however, the unexpected object starts with one of two colors, green (#1bad1b) or yellow (#cccc26). It remains this color for 24 frames, then linearly interpolates to the other color (yellow if it begins as green, green if it begins as yellow) for 10 frames, then remains its final color for 24 frames before offsetting. In the post-game survey, rather than being asked what color the unexpected object was, subjects are asked what color it was when they first noticed it. Pilot results indicated we could expect to exclude roughly 30% of our subjects, so we will recruit 300 with the goal of 100 usable subjects per condition.