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Effects of THIO and MA on the circadian free running period. A. Examples of wheel running actograms from SA-, THIO-, and METH-treated mice. B. Below each actogram is the F periodogram calculated from data obtained during constant darkness. C. Mean daily onsets of wheel running activity for saline and methamphetamine treated animals maintained in DD. The onset of activity is normalized to lights-off on the last day of the light-dark cycle. The error bars are not shown for clarity.
