Figure 1

Locomotor responses to light manipulation among the two groups of animals tested: open bars indicate the group experiencing continuous ambient light; hatched bars indicate those experiencing 75-mins of darkness restricted to the experimental period. Mean (± SEM) quadrant crossings according to periods are collapsed across dialysis session in the main graph as AA treatment was found to have no effect on locomotor behavior. Status of lights is indicated by the upper X-axis, and the three consecutive dialysis periods by the lower from left to right. Note the increase in behavior associated with turning off lights during the experimental period, only among those animals that experienced lights off (hatched bars) that lingered when lights were turned back on (post period). * p < 0.02 for between-subject comparisons of lights-on versus darkness exposed animals (hatched versus open bars); † p < 0.05 for within-subjects comparisons with initial (lights on) baseline among darkness exposed animals (hatched bars only).