Electrophysiological measures reveal the role of anterior cingulate cortex in learning from unreliable feedback

Although a growing number of studies have investigated the neural mechanisms of reinforcement learning, it remains unclear how the brain responds to feedback that is unreliable. A recent theory proposes that the reward positivity (RewP) component of the event-related brain potential (ERP) and frontal midline theta (FMT) power reflect separate feedback-related processing functions of anterior cingulate cortex (ACC). In the present study, the electroencephalogram (EEG) was recorded from participants as they engaged in a time estimation task in which feedback reliability was manipulated across conditions. After each response, they received a cue that indicated that the following feedback stimulus was 100%, 75%, or 50% reliable. The results showed that participants’ time estimates adjusted linearly according to the feedback reliability. Moreover, presentation of the cue indicating 100% reliability elicited a larger RewP-like ERP component than the other cues did, and feedback presentation elicited a RewP of approximately equal amplitude for all of the three reliability conditions. By contrast, FMT power elicited by negative feedback decreased linearly from the 100% condition to 75% and 50% condition, and only FMT power predicted behavioral adjustments on the following trials. In addition, an analysis of Beta power and cross-frequency coupling (CFC) of Beta power with FMT phase suggested that Beta-FMT communication modulated motor areas for the purpose of adjusting behavior. We interpreted these findings in terms of the hierarchical reinforcement learning account of ACC, in which the RewP and FMT are proposed to reflect reward processing and control functions of ACC, respectively.     

心理长度对二年级儿童数字线估计表征的影响

从心理长度的角度探讨二年级儿童在0~100和0~1000数字范围存在不同表征方式的原因。实验一要求二年级儿童完成长度均为10cm,范围分别为0~100和0~1000的数字线估计任务。实验二要求儿童对长度分别为10cm和18cm,范围均为0~1000的数字线进行估计。结果发现在两个实验中二年级儿童的估计均存在心理长度,但与以往研究的一年级儿童相比,心理长度的范围有所缩小。随着数字范围的增大或长度的减小,儿童的表征方式出现了从线性表征向对数表征的转变趋势。这些结果表明不精确的表征方式可能与心理长度策略的使用有关,心理长度在一定程度上影响了二年级儿童的估计表征方式。     

Community identity as a mediator of the relationship between socioeconomic status and altruistic behaviour in Chinese residents

Socioeconomic status is related to altruistic behaviour, but the link between them remains controversial. The present study explored the link between socioeconomic status and altruistic behaviour, as well as the psychological mechanism between them. We recruited 1,052 residents from 34 provinces in China to investigate the relationship between socioeconomic status and altruistic behaviour and the mediating mechanism. Results showed that objective socioeconomic status was positively related to altruistic behaviour. Subjective socioeconomic status was positively associated with community identity and altruistic behaviour. Community identity mediated the relationship between subjective socioeconomic status and altruistic behaviour. The findings suggest that enhancing individuals' community identity or subjective status perception can effectively increase their altruistic behaviour.     

Psychologists’ Leadership Roles and Leadership Training Needs in Academic Health Centers

Journal of Clinical Psychology in Medical Settings - Psychologists are increasingly called upon to become more involved in academic health centers (AHCs) as leaders across a range of leadership...     

State anxiety reduces procrastinating behavior

Three experiments conducted in China and the US investigated the impact of state anxiety on behavioral procrastination. Participants were induced into a high- or a low-anxiety state and then given a period of 12 min either to practice for an upcoming test or entertain themselves (e.g., watch videos). The results showed that participants in a high-anxiety state spent more time practicing for the upcoming test than participants in a low-anxiety state. Impulsivity and trait procrastination were also measured. Impulsivity was found to be positively correlated with both trait procrastination and dilatory behavior. Overall the findings support a self-regulatory theory account such that the negative emotion associated with anxiety motivates people to increase the effort towards reaching a goal and take proactive measures for the most important task, thus reducing procrastination.     

The Effect of a Mindfulness Practice and Dispositional Mindfulness on Affective Forecasting

A field experiment was conducted to evaluate whether mindfulness produces higher affective forecasting accuracy. Participants were randomized into a mindfulness-task, control-task, or baseline condition and then forecasted their positive and negative affect upon completion of an exam and upon receiving the exam grade. They also predicted their exam score. Those in the mindfulness-task condition more accurately predicted positive and negative affect upon exam completion and more accurately predicted negative affect and exam performance upon receiving their actual exam grade. Dispositional mindfulness predicted more accuracy in forecasting negative affect upon exam completion. Results suggest that mindfulness produces higher affective forecasting accuracy, particularly for negative affect. However, evidence was more mixed when considering the dispositional mindfulness results and for positive affect.     

Human Flesh Search Engine and Online Privacy

Human flesh search engine can be a double-edged sword, bringing convenience on the one hand and leading to infringement of personal privacy on the other hand. This paper discusses the ethical problems brought about by the human flesh search engine, as well as possible solutions.     

On the relationship between phonological awareness,morphological awareness and Chinese literacy skills: evidence from an 8‐year longitudinal study

The present study reported data on phonological awareness, morphological awareness, and Chinese literacy skills of 294 children from an 8‐year longitudinal study. Results showed that mainland Chinese children's preliterate syllable awareness at ages 4 to 6 years uniquely predicted post‐literate morphological awareness at ages 7 to 10 years. Preliterate syllable awareness directly contributed to character reading and writing at age 11 years, while post‐literate phonemic awareness predicted only character reading at age 11 years. In addition, preliterate syllable and morphological awareness at ages 4 to 6 years had indirect effects on character reading and writing, reading fluency, and reading comprehension at age 11 years, through post‐literate morphological awareness at ages 7 to 10 years. Findings underscore the significant role of syllable awareness in Chinese character reading and writing, and the importance of morphological awareness in character‐level processing and high‐level literacy skills. More importantly, our results suggest the unique relation of syllable awareness and morphological awareness in Chinese as they focus on the same unit, which is also likely to map directly onto a character, the basic unit for high‐level Chinese reading skills.     

Recollections of childhood bullying and multiple forms of victimization: correlates with psychological functioning among college students

This retrospective investigation examined the association among childhood bullying victimization, multiple forms of victimization, and psychological functioning in a college sample. Four hundred-and-eighty-two undergraduate students participated in the study (M = 19.98 years, SD = 1.82). The sample included 65 % women. For race/ethnicity, 66.4 % were European-American (N = 320), 16.8 % African-American (N = 81). For grade level, 21.6 % were freshmen (N = 104), followed by 38.2 % sophomores (N = 184), 16.2 % juniors (N = 78), and 23.4 % seniors (N = 113). Participants completed a survey packet of measures assessing childhood bullying victimization experiences and current levels of psychological functioning. Findings indicated that bullying victimization significantly predicted greater levels of depression, anxiety, and post-traumatic stress (PTS) after controlling for other childhood victimization experiences. PTS symptoms were predicted by exposure to community violence and child abuse with bullying victimization was found to be the strongest predictor. College-level practitioners need to assess for a wide range of childhood victimization experiences, including bullying victimization.     

反馈负波及其理论解释

反馈负波（feedback related negativity, FRN）是由代表行为错误或失去金钱等负性反馈刺激诱发的一种脑电波成分,出现在刺激呈现后250~300ms左右,偶极子源定位发现这一成分产生于前扣带回附近。对于FRN的功能意义的解释主要有强化学习理论和情绪动机假说,前者认为FRN反映的是神经系统对反馈刺激的认知加工过程,而后者认为FRN反映的是对情绪动机意义的评价过程。两种理论框架下还有一些目前研究仍待解决的问题,可能是未来研究的方向