Figure 6.

Performance of young and old mice on a probe trial conducted after the last session of the acquisition phase of spatial swim maze training, when the platform had been lowered below the surface of the water for a period of 30 s. Performance is expressed as the percentage of probe trial time ±SE spent in the target quadrant, in a 40- and 20-cm annulus over the center of the platform position, as well as the number of target entries ±SE made by the mice. The dashed lines represent the percentage of time mice would spend in a specific area due to chance. Each value represents the mean ±SE of 19 young or 27 old mice