This study using the Visual Expectation Paradigm explored ways in which predictability of stimulus location and time of appearance affect the formation of expectations in infants of 3 months. A total of 64 babies were randomly assigned to one of four groups that differed by predictability of stimulus location and time of stimulus appearance. Infants were presented 70 pictures in a session of approximately 2 minutes. Pictures appeared randomly in 1 of 6 locations. The inter-stimulus interval was a mixed series of 700, 1,000 or 1,300 milliseconds (ms). Ten identical events were built into the sequence for each group. These "critical events" occurred on every sixth picture and consisted of a picture presented six degrees to the left or right of visual center. This picture was always preceded by a picture on the opposite side and a 1,000 ms no-stimulus interval. The infant's right eye was videotaped using standard infrared corneal reflection techniques. Findings indicated that predictability of location positively affected response time, while predictability of time of appearance did not. However, evidence was found to substantiate the claim that predictability of time of appearance can affect performance. Anticipations were more frequent when both time and location were predictable than when only location was predictable. (RH)