부산대학교 도서관

This study used the delayed discounting task and emotional stop signal task to explore the cognitive impulsivity control of drug abusers' (amphetamines users) emotion regulation as well as decision-making to better understand any differences in drug addiction. Manipulation of whether there is a stressful situation was used to understand the behavior of drug abusers in different situations and the differences they showed from ordinary people's behavior, allowing comparison of any changes in cognitive impulsivity in decision-making. From the results of the low and high reward conditions used in a delayed discounting task, data suggest that the impulsivity (indicated by the K value calculated from task performance) of the experimental group in the stress condition was significantly higher than that of the control group. However, there was no significant difference between the experimental group and the control group in the no stress condition. It was also found that the impulsivity rate of the experimental (drug abuser) group in a stressful situation (as indicated by the rate of choosing an immediate rather than a delayed reward) was as high as 80.5%, compared with the rate in a stress-free situation (64.2%). The behavioral results for an emotional stop signal task found that in the emotionally negative condition, the go reaction time of the experimental group was significantly higher than that of the control group, whereas there was no significant difference between the two groups in the neutral situation. In addition, the correct rate of go responses in the experimental group was significantly lower than in the control group. This study also found that the experimental group's go response error rate increased in the negative emotional condition and the reaction time was longer. This seems to indicate that this negative context affects the behavioral excitatory system of amphetamine abusers, rather than affecting the behavioral inhibition system. It is hoped that, based on the data from this study, we can further design research related to stress and its effects on the behavioral stimulation system as an indicator to predict whether drug abusers will re-use drugs after receiving treatment.