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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Alcohol Clin Exp Res. 2016 Dec 20;41(1):187–196. doi: 10.1111/acer.13275

Fig. 2.

Fig. 2

Age-related differences in photocycle entrainment. (A) Period length did not differ between adolescents (n = 41) and adults (n = 43) in LD, indicating that both were able to entrain normally to a 24-hour photocycle. (B) Circadian rhythm amplitude was higher in adolescents compared to adults. (C) Adolescent mice became active before adults, much closer to the time of lights-off (ZT12). (D) Adolescent mice also became restful before adults, ceasing activity prior to the time of lights-on (ZT0), while adults became inactive after ZT0. (E) The duration of nightly activity (alpha) in adolescents was slightly but significantly shorter than in adults. Data are mean ± SEM; *p < 0.05.