The Police Officer's Dilemma: A Decade of Research on Racial Bias in the Decision to Shoot

We review sociological, correlational, and experimental research that examines the effect of a target's race on the decision to shoot. Much of this work involves computer‐based simulations of a police encounter, in which a participant must decide whether or not to shoot a potentially hostile target who is either Black or White. Experimental work with undergraduate participants reveals a clear pattern of bias (a tendency to shoot Black targets but not Whites), which is associated with stereotypes linking Blacks with the concept of danger. Subsequent work with police officers presents a more complex pattern. Although police are affected by target race in some respects, they generally do not show a biased pattern of shooting. We suggest that police performance depends on the exercise of cognitive control, which allows officers to overcome the influence of stereotypes, and we conclude with potential implications of this research for law enforcement.     

Ethnicity,Social Support,and Depression Among Elderly Chilean People

Recent evidence regarding the relationship between social support and depression in elderly people shows the important role of ethnicity. This research describes the characteristics of social support in a sample of elderly people aged 60 and above living in northern Chile (n = 493), and analyzes the differences in the relationship between social support and depression between an indigenous group (Aymara population, n = 147) and a nonindigenous group (white, Caucasian, mestizo, n = 346). Various dimensions of social support were considered: structural elements, functional social support according to source, and community participation. The results show the existence of significant differences in the characteristics and dimensions of social support depending on sex, ethnicity, and marital status. Further, the central role of the family group is observed for both Aymara and nonindigenous elderly people. The hierarchical regression models obtained result in notable differences in the role of the structural, functional, and community elements of support in explaining depression for the ethnic groups considered.     

Complex conditional control by pigeons in a continuous virtual environment

We tested two pigeons in a continuously streaming digital environment. Using animation software that constantly presented a dynamic, three‐dimensional (3D) environment, the animals were tested with a conditional object identification task. The correct object at a given time depended on the virtual context currently streaming in front of the pigeon. Pigeons were required to accurately peck correct target objects in the environment for food reward, while suppressing any pecks to intermixed distractor objects which delayed the next object's presentation. Experiment 1 established that the pigeons’ discrimination of two objects could be controlled by the surface material of the digital terrain. Experiment 2 established that the pigeons’ discrimination of four objects could be conjunctively controlled by both the surface material and topography of the streaming environment. These experiments indicate that pigeons can simultaneously process and use at least two context cues from a streaming environment to control their identification behavior of passing objects. These results add to the promise of testing interactive digital environments with animals to advance our understanding of cognition and behavior.     

Generalisation of fear and avoidance along a semantic continuum

Directly conditioned fear and avoidance readily generalises to dissimilar but conceptually related stimuli. Here, for the first time, we examined the conceptual/semantic generalisation of both fear and avoidance using real words (synonyms). Participants were first exposed to a differential fear conditioning procedure in which one word (e.g., “broth”; CS+) was followed with brief electric shock [unconditioned stimulus (US)] and another was not (e.g., “assist”; CS–). Next, an instrumental conditioning phase taught avoidance in the presence the CS+ but not the CS–. During generalisation testing, synonyms of the CS+ (e.g., “soup”; GCS+) and CS– (e.g., “help”; GCS–) were presented in the absence of shock. Conditioned fear and avoidance, measured via skin conductance responses, behavioural avoidance and US expectancy ratings, generalised to the semantically related, but not to the semantically unrelated, synonyms. Findings have implications for how natural language categories and concepts mediate the expansion of fear and avoidance repertoires in clinical contexts.     

Working memory and spatial judgments: Cognitive load increases the central tendency bias

Previous work demonstrates that memory for simple stimuli can be biased by information about the distribution of which the stimulus is a member. Specifically, people underestimate values greater than the distribution’s average and overestimate values smaller than the average. This is referred to as the central tendency bias. This bias has been explained as an optimal use of both noisy sensory information and category information. In largely separate literature, cognitive load (CL) experiments attempt to manipulate the available working memory of participants in order to observe the effect on choice or judgments. In two experiments, we demonstrate that participants under high cognitive load exhibit a stronger central tendency bias than when under a low cognitive load. Although not anticipated at the outset, we also find that judgments exhibit an anchoring bias not described previously.     

Validity and Reliability of the Parenting Stress Index Short Form (PSI-SF) Applied to a Chilean Sample

The Parenting Stress Index was developed in response to the need for a measure to assess the parent-child system. Its abbreviated version, the Parenting Stress Index Short Form, is an instrument with multiple clinical applications and is useful for research and intervention purposes. The Parenting Stress Index Short Form was standardized for use with parents of children ranging from 1 month to 12 years old. Several validation studies are available, most of them not supporting the original structure of three factors. No validation studies for this instrument currently exist in Latin America for a socially vulnerable population. The purpose of this study was to evaluate both the validity and internal consistency of Parenting Stress Index Short Form in a Chilean sample including 336 dyads (mean age of mothers 21.4 years; SD?=?7.38; and mean age of children 84.8 days; SD?=?78.0), demonstrating risk for negative health outcomes and who attend public primary health care. An exploratory factor analysis showed a three-factor structure that was compatible with the original version and explained 41.45?% of the variance. Internal consistency was high both for the total scale (Cronbach’s α?=?0.92) and the three subscales (0.81: Parenting Distress; 0.89: Parent–Child Dysfunctional Interaction and 0.88: Difficult Child). The Goldberg General Health Questionnaire was used to assess external criterion related validity and a positive and statistically significant correlation was found (0.86). The evidence suggests that the Parenting Stress Index Short Form can be used as an instrument to measure the relationship between parenting and stress. Due to its psychometric characteristics, it can be applied to a vulnerable Chilean population. The contribution of this study is the validation of this instrument in a Spanish speaking population with characteristics of social vulnerability.     

Cultural differences in body dissatisfaction: Japanese adolescents compared with adolescents from China,Malaysia, Australia,Tonga, and Fiji

Cultural influences on the body image of 133 female and 99 male Japanese adolescents aged 12–18 years (M = 15.9, SD = 1.2) were compared to those of a databank of 1233 female and 1149 male adolescents also aged 12–18 years (M = 14.9, SD = 1.5) from five cultures – Chinese, Malaysian, Australian, Tongan, and indigenous Fijian – surveyed previously using identical body image measures (Fuller‐Tyszkiewicz et al., 2012). Japanese adolescents reported the highest levels of body dissatisfaction despite possessing among the lowest body mass index (BMI) and also reported among the highest levels of media influence on their body image. Subsequent path analyses revealed that for Japanese adolescents cultural identification with modern Japanese values were associated with increased body dissatisfaction, and that this association was mediated by level of media influence. These results highlight the importance of cultural influences, as well as individual differences in cultural values, in shaping Japanese adolescents' body image.     

Short theta burst stimulation to left frontal cortex prior to encoding enhances subsequent recognition memory

Deep semantic encoding of verbal stimuli can aid in later successful retrieval of those stimuli from long-term episodic memory. Evidence from numerous neuropsychological and neuroimaging experiments demonstrate regions in left prefrontal cortex, including left dorsolateral prefrontal cortex (DLPFC), are important for processes related to encoding. Here, we investigated the relationship between left DLPFC activity during encoding and successful subsequent memory with transcranial magnetic stimulation (TMS). In a pair of experiments using a 2-session within-subjects design, we stimulated either left DLPFC or a control region (Vertex) with a single 2-s train of short theta burst stimulation (sTBS) during a semantic encoding task and then gave participants a recognition memory test. We found that subsequent memory was enhanced on the day left DLPFC was stimulated, relative to the day Vertex was stimulated, and that DLPFC stimulation also increased participants’ confidence in their decisions during the recognition task. We also explored the time course of how long the effects of sTBS persisted. Our data suggest 2 s of sTBS to left DLPFC is capable of enhancing subsequent memory for items encoded up to 15 s following stimulation. Collectively, these data demonstrate sTBS is capable of enhancing long-term memory and provide evidence that TBS protocols are a potentially powerful tool for modulating cognitive function.