Electrophysiological correlates of encoding processes in a full-report visual working memory paradigm

Why are some visual stimuli remembered, whereas others are forgotten? A limitation of recognition paradigms is that they measure aggregate behavioral performance and/or neural responses to all stimuli presented in a visual working memory (VWM) array. To address this limitation, we paired an electroencephalography (EEG) frequency-tagging technique with two full-report VWM paradigms. This permitted the tracking of individual stimuli as well as the aggregate response. We recorded high-density EEG (256 channel) while participants viewed four shape stimuli, each flickering at a different frequency. At retrieval, participants either recalled the location of all stimuli in any order (simultaneous full report) or were cued to report the item in a particular location over multiple screen displays (sequential full report). The individual frequency tag amplitudes evoked for correctly recalled items were significantly larger than the amplitudes of subsequently forgotten stimuli, regardless of retrieval task. An induced-power analysis examined the aggregate neural correlates of VWM encoding as a function of items correctly recalled. We found increased induced power across a large number of electrodes in the theta, alpha, and beta frequency bands when more items were successfully recalled. This effect was more robust for sequential full report, suggesting that retrieval demands can influence encoding processes. These data are consistent with a model in which encoding-related resources are directed to a subset of items, rather than a model in which resources are allocated evenly across the array. These data extend previous work using recognition paradigms and stress the importance of encoding in determining later VWM retrieval success.     

The Current State of Intervention Research for Posttraumatic Stress Disorder Within the Primary Care Setting

Posttraumatic Stress Disorder (PTSD) is common among primary care patients and is associated with significant functional impairment, physical health concerns, and mental health comorbidities. Significant barriers to receiving adequate treatment often exist for primary care patients with PTSD. Mental health professionals operating as part of the primary care team have the potential to provide effective brief intervention services. While good PTSD screening and assessment measures are available for the primary care setting, there are currently no empirically supported primary care-based brief interventions for PTSD. This article reviews early research on the development and testing of primary care-based PTSD treatments and also reviews other brief PTSD interventions (i.e., telehealth and early intervention) that could be adapted to the primary care setting. Cognitive and behavioral therapies currently have the strongest evidence base for establishing an empirically supported brief intervention for PTSD in primary care. Recommendations are made for future research and clinical practice.     

The Art of the Unseen: Three challenges for Racial Profiling

This article analyses the moral status of racial profiling from a consequentialist perspective and argues that, contrary to what proponents of racial profiling might assume, there is a prima facie case against racial profiling on consequentialist grounds. To do so it establishes general definitions of police practices and profiling, sketches out the costs and benefits involved in racial profiling in particular and presents three challenges. The foundation challenge suggests that the shifting of burdens onto marginalized minorities may, even when profiling itself is justified, serve to prolong unjustified police practices. The valuation challenge argues that although both costs and benefits are difficult to establish, the benefits of racial profiling are afflicted with greater uncertainty than the costs, and must be comparatively discounted. Finally, the application challenge argues that using racial profiling in practice will be complicated by both cognitive and psychological biases, which together reduce the effectiveness of profiling while still incurring its costs. Jointly, it is concluded, these challenges establish a prima facie case against racial profiling, so that the real challenge consists in helping officers practice the art of the police and not see that which it is useless that they should see.     

Follow your heart: Emotion adaptively influences perception

The current review introduces a new program of research that suggests the perception of spatial layout is influenced by emotions. Though perceptual systems are often described as closed and insulated, this review presents research suggesting that a variety of induced emotions (e.g., fear, disgust, sadness) can produce changes in vision and audition. Thus, the perceptual system may be highly interconnected, allowing emotional information to influence perceptions that, in turn, influence cognition. The body of work presented here also suggests that emotion-based changes in perception help us solve particular adaptive problems because emotion does not change all perceptions of the world. Taking the adaptive significance of emotion into account allows us to make predictions about when and how emotion influences perception.     

The influence of rumination and defensiveness on negative affect in response to experimental stress

Previous experiments investigating the influence of rumination on negative affect have often manipulated the timing and content of rumination, which may be problematic as rumination is phenomenologically experienced as uncontrollable. In the present experiment, rumination was not manipulated, but measured as an individual tendency before the experiment. Furthermore, it was tested whether defensiveness would reduce the higher degree of negative affect often associated with rumination. Fifty-six participants completed questionnaires measuring rumination and defensiveness and participated in a phrase completion task, rating negative affect before and after the task. Correlational analyses showed that rumination was positively associated (p < 0.05) with affect responses (r range = 0.35-0.61), whereas defensiveness was negatively associated with affect responses (r range =-0.27-0.32). Four groups of high and low rumination and defensiveness scorers were created using median splits. An ANOVA showed that scoring high on defensiveness did not reduce the negative affect experienced by high ruminating participants.     

Personal memories for remote historical events: accuracy and clarity of flashbulb memories related to World War II

One hundred forty-five Danes between 72 and 89 years of age were asked for their memories of their reception of the news of the Danish occupation (April 1940) and liberation (May 1945) and for their most negative and most positive personal memories from World War II. Almost all reported memories for the invasion and liberation. Their answers to factual questions (e.g., the weather) were corroborated against objective records and compared with answers from a younger control group. The older participants were far more accurate than what could be predicted on the basis of results from test-retest studies using short delays. The "permastore" metaphor (Bahrick, 1984) provides a possible interpretation of this discrepancy. Participants with reported ties to the resistance movement had more vivid, detailed, and accurate memories than did participants without such ties. Ratings of surprise and consequentiality were unrelated to the accuracy and clarity of the memories.     

Infants learn phonotactic regularities from brief auditory experience

Two experiments investigated whether novel phonotactic regularities, not present in English, could be acquired by 16.5-month-old infants from brief auditory experience. Subjects listened to consonant-vowel-consonant syllables in which particular consonants were artificially restricted to either initial or final position (e.g. /baep/ not /paeb/). In a later head-turn preference test, infants listened longer to new syllables that violated the experimental phonotactic constraints than to new syllables that honored them. Thus, infants rapidly learned phonotactic regularities from brief auditory experience and extended them to unstudied syllables, documenting the sensitivity of the infant's language processing system to abstractions over linguistic experience.     

Measuring transactive memory systems in the field: scale development and validation

This study describes the development and validity testing of a field measure of transactive memory systems. Transactive memory systems are especially important for teams designed to leverage members' expertise, but field research has lagged because there are no adequate measures of the construct. The author developed and tested a 15-item scale in a laboratory sample of 124 teams, a field sample of 64 Master of Business Administration consulting teams, and a field sample of 27 teams from technology companies. Results from the present study demonstrate that the scale is internally consistent, related to alternative measures and hypothesized causes and effects, and unrelated to theoretically distinct constructs, providing evidence of convergent, criterion-related, and discriminant validity. Suggestions for improving the scale, future validity testing, and possible boundary conditions are discussed.