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Effect of lithium chloride (LiCl) and methamphetamine (MAP) on the free-running rhythm of wheel-running activity in constant light. Arrows along the side of each actogram indicate days of treatment with MAP and LiCl. Periodograms along with the replotted activity data [with period of the time base set to match τ, i.e. 40h in (a) and 33 h in (b), double plotted] appear in the inset. In (b), periods (in hours) are noted to the right of the actogram.
