Figure 4.

Mice preferentially explored the location of the absent object. Example occupancy maps (average tracker output over time) illustrate exploratory behavior for both present-object (white outlines) as well as the absent-object locations during the object removal (OR) session. Absent-object exploration was seen both for mice that explored the objects only once (single exposure; A) as well as mice that had been extensively familiarized to both objects before object removal (repeated exposure; B). See Results (Object removal) for group behavioral data. Gray bars represent the 6 h delay between sessions. Occupancy scale is the same in both sessions.