Toward a Mechanistic Understanding of Human Decision Making: Contributions of Functional Neuroimaging

ABSTRACT— This article considers the contribution of functional neuroimaging toward understanding the computational underpinnings of human decision making. We outline the main processes likely underlying the capacity to make simple choices and describe their associated neural substrates. Relevant processes include the ability to encode a representation of the expected value or utility associated with each option in a decision problem, to learn such expectations through experience, and to modify action selection in order to choose those actions leading to the greatest reward. We provide several examples of how functional neuroimaging data have helped to shape and inform theories of decision making over and above results available from traditional behavioral measures.     

奖惩中枢与学习

奖惩现象及实验揭示了:兴奋了奖赏中枢的思想、行为(神经通路)能被奖赏中枢强烈易化,而兴奋了惩罚中枢的思想、行为能被惩罚中枢强烈抑制。在此基础上,通过讨论奖惩中枢在学习中的作用得出:思想、行为的动力由奖惩中枢影响产生;奖惩中枢在思想、行为(神经兴奋)习惯的选择、形成过程中起着主要作用。     

Children’s competitive peer aggression during reward and punishment

Behavior‐disordered children (N = 65) competed with a presumed unknown peer on consecutive administrations of an analogue aggression task of instrumental aggression (blocking the opponent’s game) and hostile aggression (sending the opponent a noise). The first administration as a reward‐only, nonpunishment condition. The second administration contained both reward and punishment conditions. Results indicated clear differences on aggressive responding during conditions of reward and punishment. Significant correlations were found between instrumental aggression during reward across the two administrations, whereas correlations between aggression during reward and aggression during punishment were nonsignificant. Teacher ratings of Covert‐Proactive Aggression correlated with analogue task instrumental aggression but not with hostile aggression on both administrations. Aggression during punishment was significantly correlated with Continuous Performance Test inattention and impulsivity scores, suggesting that impulsivity and inattention may play an important role in children’s ability to inhibit aggression during cues for punishment. These data indicate the utility of a laboratory analogue procedure to assess conditions associated with childhood aggression and to further our understanding of childhood aggression subtypes. Aggr. Behav. 27:1–13, 2001. © 2001 Wiley‐Liss, Inc.     

The future of Canadian counselling psychology: Doctoral students

Little is known about the overall characteristics and beliefs of Canadian counselling psychology doctoral students. An online survey was administered to 43 doctoral students across all Canadian counselling psychology programmes, representing an approximate 26% response rate. Results indicated that the average age of doctoral students in the sample was about 32 years and that the majority were women (about 77% in the sample). Additionally, findings can be taken to suggest that participants were satisfied with their choice of counselling psychology as a career. The doctoral students sampled primarily practised from an integrationist theoretical standpoint and spent very little of their practice time providing formal psychological assessment services or career counselling. Participants generally intervened through individual counselling or psychotherapy and were focused on disorder treatment rather than preventative or developmental services. Curriculum changes that should be considered from the results of this study pertain to the topics of assessment, career counselling, advocacy/media skills, professional identity development and prevention/developmental interventions. The results of this study can also be taken to predict characteristics of the next generation of Canadian counselling psychologists and the future practice of counselling psychology in Canada.     

Development and current status of counselling psychology in Taiwan

This article details the three stages of counselling psychology’s development in Taiwan, including pre-legislation, legislation and post-legislation. In pre-legislation stage, a brief historical review of the growth of counselling and guidance is introduced, which is the root of the contemporary counselling psychology. The process of the Psychology Act’s legislation is described in legislation stage and the relationships between counselling teachers and clinical psychologist are also discussed. In the post-legislation stage, the licensure system, training programmes, main professional organizations, work settings, and the major opportunities and challenges for the counselling psychology field are presented. In addition, the article refers to data from a national survey of 124 counselling psychologists to provide a profile of the counselling psychologists in Taiwan.     

Reward Processing and Decision-Making in Posttraumatic Stress Disorder

Theory suggests that, in those with posttraumatic stress disorder (PTSD), positive emotion is likely dampened due to reexperiencing of trauma-related stimuli. Prior research has extended positive emotion experiencing to reward processing research but has not yet examined how trauma cues affect reward processing (i.e., the anticipation of and satisfaction with reward) and decision-making in individuals with PTSD. We compared 24 individuals diagnosed with PTSD to 29 trauma-exposed controls in passive and decision-making phases of a wheel-of-fortune task, following both neutral and trauma inductions. Three types of spinners were used in the task: spinners that were obviously advantageous spinners, obviously disadvantageous spinners, and ambiguously advantageous spinners with outcomes averaging to a net gain. We hypothesized that the PTSD group would report lower reward expectation and lower outcome satisfaction and make less advantageous decisions, differences that would be exacerbated following a trauma prime. The PTSD group reported lower reward expectation than controls for the ambiguous spinners only, suggesting that the reduced anticipation of reward associated with PTSD may be specific to ambiguous stimuli. Reward expectation was not affected by the type of prime. Outcome satisfaction was not affected by PTSD or type of prime. Although only marginally significant, the PTSD group played the ambiguous spinners less often than controls, and played the obviously disadvantageous spinners significantly less often than controls, suggesting that those with PTSD are more aversive to loss. Our findings suggest that PTSD-related deficits are more robust for reward expectation than outcome satisfaction, and support future research examining the role of reward-related decision-making in PTSD.     

Social importance enhances prospective memory: evidence from an event-based task

Prospective memory performance can be enhanced by task importance, for example by promising a reward. Typically, this comes at costs in the ongoing task. However, previous research has suggested that social importance (e.g., providing a social motive) can enhance prospective memory performance without additional monitoring costs in activity-based and time-based tasks. The aim of the present study was to investigate the influence of social importance in an event-based task. We compared four conditions: social importance, promising a reward, both social importance and promising a reward, and standard prospective memory instructions (control condition). The results showed enhanced prospective memory performance for all importance conditions compared to the control condition. Although ongoing task performance was slowed in all conditions with a prospective memory task when compared to a baseline condition with no prospective memory task, additional costs occurred only when both the social importance and reward were present simultaneously. Alone, neither social importance nor promising a reward produced an additional slowing when compared to the cost in the standard (control) condition. Thus, social importance and reward can enhance event-based prospective memory at no additional cost.     

关于地区机构伦理委员会的调研与思考

通过对辽宁地区29家机构伦理委员会的机构设置情况、工作内容、伦理审查工作的管理等状况的调研,为了解我国医学伦理委员会的发展现状,存在的问题及发展方向提供局部的现实依据,为进一步完善我国医学伦理委员会建设提出建议。     

Affective regulation in trichotillomania: Evidence from a large-scale internet survey

Trichotillomania (TTM), a repetitive hair-pulling disorder, is underrepresented in the clinical literature. The current project explores the relationship between affective regulation and disordered hair-pulling. Previous research suggests that cycles of emotional states are correlated with the disorder and may induce, reinforce, or otherwise contribute to hair-pulling behavior. We use anonymous internet survey responses from 1162 self-identified hair-pullers to address four questions about affective regulation in people with TTM: (1) Do hair-pullers experience greater difficulty “snapping out” of affective states than non-pullers? (2) Does difficulty with emotional control correlate with TTM severity? (3) Are subtypes identifiable based on the emotions that trigger hair-pulling behavior? (4) Does difficulty “snapping out” of an emotion predict whether that emotion triggers pulling behavior? The results showed a small-to-moderate relationship between affective regulation and problematic hair-pulling. In addition, individual patterns of emotion regulation were systematically related to emotional cues for hair-pulling as well as overall hair-pulling severity. These findings contribute to an understanding of the phenomenology of TTM and provide empirical support for treatments focused on affect regulation.