**Exclusion Criteria** Subject data will be excluded on the following grounds: * Subjects reported being under 18 years of age. * Subjects reported problems with experimental playback, such as stuttering, freezing (pre-determined options) or another issue specified in a free-response. A coder who is blind to the condition assignment will examine these open-ended responses to determine whether or not the subject should be excluded. When the response is ambiguous, their data will be excluded. * Subjects reported needing correction to their vision but not wearing it during the experiment. * Subjects reported counts that err by more than 50% in either direction more than once. * Subjects reported having performed a similar task before, wherein they tracked multiple objects and something unexpected appeared. If subjects reported participating in a similar task, an independent coder will examine their descriptions of prior experience to determine whether the subject should be excluded. * Subjects failed to answer any question during the course of the experiment. We are eliminating the "full attention" trial as a check; in the previous study it increased our exclusion rate to 60%, but those exclusions, when analyzed, did not change the pattern of the results. **Measures** <br> After each trial in which no unexpected object appears and after the critical trial, we will collect subjects' counts of how many times the attended objects bounced off the edge of the frame. On the critical trial and the full-attention trial, we will ask whether subjects noticed an extra object on that trial, and then ask them to describe the shape and color from a menu of pre-determined options. Subjects will be counted as having noticed the object only if they affirm having seen something new and correctly identify either its shape, color, or both. <br> We will also collect a set of demographic data for exclusion purposes, as well as characterizing our sample. **Analysis** <br> We will conduct two tests: one on the (notice vertical - notice horizontal) difference score in the attend rectangles condition, and one on the (notice vertical - notice horizontal) difference score on the attend circles condition. For each test, we will determine the difference in noticing rates for each condition and will compute a 95% confidence interval around that difference to determine whether it includes 0.