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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Pharmacol Biochem Behav. 2015 Jan 28;131:57–63. doi: 10.1016/j.pbb.2015.01.014

Figure 1.

Figure 1

Effect of P/T depletion on PAEs is age dependent. a) There is no effect of P/T depletion on total PAEs b) There is no effect of P/T depletion on PAEs when the data are separated by block. c) There is a significant correlation between the age of the participant and the effect of P/T depletion on PAEs (95% CI, −0.71– −2.27, r=−0.74, p=0.001). d) When participants are separated into emerging adult (22–25 years old) and adult (26–40 years old) groups, there is a significant beverage×group interaction (F(1,14)=18.35; p=0.001, η2=0.07), where the adult participants (n = 9) perform better on the P/T[−] beverage (t(8)=3.2, p=0.007, Cohen’s d=−0.88), and the emerging adult participants (n = 7) perform worse (t(6)=−3.6, p=0.006, Cohen’s d=−0.60). PAEs, Passive Avoidance Errors; P/T[-], phenylalanine/tyrosine-depleted beverage.