Indeed, on the two gambling tasks, the majority of the detected group differences were between the naltrexone and placebo groups: the naltrexone group had a greater physiological response to winning outcomes on the slot machine task, in terms of EDA (significant) and HR deceleration (marginally significant).
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Opioidergic and dopaminergic manipulation of gambling tendencies: a preliminary study in male recreational gamblers.
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The sentences
The main effects of Treatment [ F (2, 57) = 2.42, p = 0.098, η 2 p = 0.08] and Time [ F (1, 57) = 3.44, p = 0.069, η 2 p = 0.06] approached significance.