A learning rule that explains how rewards teach attention

Many theories propose that top-down attentional signals control processing in sensory cortices by modulating neural activity. But who controls the controller? Here we investigate how a biologically plausible neural reinforcement learning scheme can create higher order representations and top-down attentional signals. The learning scheme trains neural networks using two factors that gate Hebbian plasticity: (1) an attentional feedback signal from the response-selection stage to earlier processing levels; and (2) a globally available neuromodulator that encodes the reward prediction error. We demonstrate how the neural network learns to direct attention to one of two coloured stimuli that are arranged in a rank-order. Like monkeys trained on this task, the network develops units that are tuned to the rank-order of the colours and it generalizes this newly learned rule to previously unseen colour combinations. These results provide new insight into how individuals can learn to control attention as a function of reward contingency.     

When Birds of a Feather Flock Together: The Role of Core-Self Evaluations and Moral Intensity in the Relationship Between Network Unethicality and Unethical Choice

Leveraging perspectives from social cognitive theory, the attention-based view, and social networks literatures, we tested the relationship between unethical choice and network unethicality, which we define as respondents’ perceptions of their peer advisors’ unethical choices. Although social cognitive theory predicts that perceptions of peer advisor unethical choice are positively associated with unethical choice, we theorize that the nature of this relationship depends on the personality of the actor (core self-evaluation) and the situation (moral intensity). Results from a lagged study suggest that individual and situational variables may act as key buffers to the adverse impact of unethical social influence on ethical choice. Strengths, limitations, and directions for future research are discussed.     

孤独症谱系障碍者的情绪韵律识别

情绪韵律识别是从声学线索变化中提取情绪信息,进而推断他人情绪状态的过程。情绪韵律识别缺陷是孤独症谱系障碍者的一种常见表现,此缺陷会受到情绪韵律强度、字面语义、情景语境、心理声学能力和共患疾病的影响。目前,该人群情绪韵律识别缺陷的原因探析集中于心智化能力不足、社会动机缺失和经验匮乏假说等。孤独症谱系障碍者情绪韵律识别的神经机制研究主要集中于与健康人群的比较,相关发现包括情绪韵律识别的右半球优势效应、局部脑区激活增多、大脑网络连接不足和早期注意模式异常。未来,应该进一步提高实验范式的生态效度,注重孤独症个体差异因素,整合相关理论解释,并开发有效的测评工具和干预策略。     

风险决策的神经机制:基于啮齿类动物研究

风险决策是在不同选项的结果确定、并且结果出现的概率已知情况下的决策。啮齿类风险决策模型研究发现前额皮层-杏仁核-伏隔核神经环路联系是决定风险决策的选择倾向的关键。前额皮层中的眶额皮层和内侧前额皮层参与风险决策的策略形成和策略转换有关;而皮层下核团中的杏仁核、腹侧纹状体的伏隔核等结构参与策略保持、价值判断,影响决策偏向和行动强度;眶额皮层、伏隔核神经元和多巴胺神经元编码风险决策过程中的概率、风险等因素;此外,多巴胺等单胺类神经递质及受体在风险决策中有复杂的作用。     

Contextualizing the Psychosocial Well‐being of Military Members and Their Partners: The Importance of Community and Relationship Provisions

Evidence of the impact of communities has been documented for a variety of individual and relational outcomes, including mental and physical health as well as the quality of romantic and parent–child relationships. The military represents a rather unique work context; in that, it is generally considered a lifestyle with a distinct culture and community. Yet, military families are also members of their broader, comprehensive community. Drawing from the social organizational theory of action and change (SOC) (Mancini & Bowen, 2013), and relationship provisions theory (Weiss, 1969) and utilizing a sample of 266 active duty military families, this study examined connectedness with the military community and the broader, comprehensive community. A dyadic model was evaluated whereby each partner's perspective of their comprehensive and military community was hypothesized to influence their own psychosocial well‐being as well as their partner's psychosocial well‐being. The role of relationship provisions (that is, having relationship needs met) as a mechanism linking community connections to psychosocial well‐being was also examined. Overall, the findings supported the hypothesized model, particularly for intra‐individual effects and military members. Findings emphasize the importance of considering what is gained from connections within a community rather than a focus solely on the connections themselves.     

Social Network Characteristics,Social Support,and Cigarette Smoking among Asian/Pacific Islander Young Adults

Cigarette smoking may be one of the factors contributing to the high levels of cancer‐related mortality experienced by certain Asian/Pacific Islander (A/PI) subgroups (e.g., Native Hawaiian). Given the collectivist cultural orientation attributed to A/PI groups, social strategies are recommended for substance abuse or smoking cessation treatment among A/PI. However, research examining how social network characteristics and social support relate to smoking across A/PI subgroups has been lacking. This study investigated the associations between social network characteristics (e.g., size, composition), perceived social support, and recent cigarette use across Native Hawaiian, Filipino, and East Asian (e.g., Japanese, Chinese) young adults (18–35 year old). Cross‐sectional, self‐report data were collected from N = 435 participants (M age = 25.6, SD = 8.3; 61% women). Ethnic differences were found in a number of pathways linking social network characteristics, perceived social support, and cigarette smoking. Larger network size was strongly associated with higher perceived social support and lower recent cigarette smoking among Native Hawaiians but not Filipinos or East Asians. Higher perceived social support was associated with lower recent smoking among East Asians and Filipinos but not Native Hawaiians. Implications are discussed with regard to smoking prevention and cessation among A/PI.     

Accuracy Motivations,Predispositions, and Social Information in Political Discussion Networks

This analysis studies how variation in individuals' motivation to form accurate judgments affects the process of political discussion. I use a small‐group experiment in which participants compete to elect the simulated candidate who best represents their true preferences. I manipulate economic incentives to control participants' accuracy motivations. The results show that accuracy‐motivated participants, compared to those with weaker accuracy goals, seek discussants with more expertise and a more diverse set of viewpoints, place greater emphasis on socially provided messages, and reduce emphasis on political predispositions. As a result of these differences, however, accuracy‐motivated participants rely more heavily on biased information. Hence, accuracy motivations do not produce more accurate judgments or better decisions. Although previous work on political discussion has largely ignored the role of motivations, these results suggest that accuracy motivations play an important but nuanced role in this process. Strengthened accuracy motivations increase individuals' exposure to political expertise and ideological diversity but also increase their potential to be misled.     

The Temporal Dynamics of Regularity Extraction in Non‐Human Primates

Extracting the regularities of our environment is one of our core cognitive abilities. To study the fine‐grained dynamics of the extraction of embedded regularities, a method combining the advantages of the artificial language paradigm (Saffran, Aslin, & Newport, 1996 ) and the serial response time task (Nissen & Bullemer, 1987 ) was used with a group of Guinea baboons (Papio papio) in a new automatic experimental device (Fagot & Bonté, 2010 ). After a series of random trials, monkeys were exposed to language‐like patterns. We found that the extraction of embedded patterns positioned at the end of larger patterns was faster than the extraction of initial embedded patterns. This result suggests that there is a learning advantage for the final element of a sequence that benefits from the contextual information provided by previous elements.     

错误相关负波的神经起源及其影响因素

与个体做出错误反应相伴的错误相关ERP成分叫错误相关负波 (error-related negativity, ERN),当前冲突监控理论、表征失匹配理论和强化学习理论从不同的角度对ERN的神经机制进行解释,各理论间并非完全相互排斥。目前大部分研究认为ERN定位于扣带回,部分研究则出现其它脑区的激活,然而,扣带回与其它脑区存在复杂的神经功能联系,ERN 电位很可能是多个脑区电活动在头颅的综合表现,而非某一脑区的单独表现。ERN的神经机制受到实验任务、被试年龄及其意识水平等因素的影响。未来要推动实验室研究走向临床应用,发现与诊断脑电波异常的病人和毒品易复吸人群。