r codes and communicating with the staff via computer. In order for them to be effective in the experiment all the participants were trained to do tasks on the computer. They had to try and complete these computerized psycho-motor tasks while under the influence of MA during the study period.Prior to their first official day, the staff got the participants accustomed to the experimental days they were going to go through. They were given questionnaires about their sleep, their feelings, and their physical state. The participants would have to fill these out throughout the study to determine the effect the drug was having on them. Their drug use, food consumption and habits, drug choices, and sleep record where all noted to determine who used what drugs, why, how they felt, and whether they chose to do more.The data collected was analyzed and then statistically and graphically represented in the article. The statistics and graphs showed a tendency of the subjects to choose to self-administer approximately four doses of MA (compared to only one placebo dose.) It had been previously reported that methamphetamine works as a positive reinforcer in lab animals (Pickens et al. 1967; Balster and Schuster 1973; Yokel and Pickens 1973; Balster et al. 1976, Johanson et. Al. 1976; Munzar et al. 1999; Stefanski et al. 1999)The data reflected that the choice to self-administer methamphetamine was not dose-dependent, even though the larger doses were rated as more likely to be rated as “High, Good Drug Effect, Stimulated” than the lower doses. That could either be because the participants couldn’t totally tell the difference between 5mg and 10mg active doses of methamphetamine. In fact, the questionnaires about drug reactions reflected no differences in results from the 5mg versus the 10mg dose. If they had used larger doses then the difference probably would have been noticable. It could also be because the $1 vouchers we...
