Experimental sessions took place in a hospital under medical supervision. Participants arrived in the mid-morning or early afternoon (depending on availability), receiving instructions not to eat within 4 hours or consume alcohol within 24 hours of arrival. Cigarette use was not allowed after arrival. Participants provided a breath alcohol reading (all tests were negative) and received a standardized snack. Women also completed a pregnancy test. Participants were then escorted to a private room and seated in a recliner chair, where the study nurse placed an indwelling catheter. After receiving orientation and instructions from a research assistant, participants completed baseline subjective questionnaires.
