The medial temporal lobe and visual working memory: Comparisons across tasks, delays, and visual similarity

Whether the hippocampus and medial temporal lobe (MTL) play any important role in visual working memory is a relatively new and controversial research question. The primary goal of this study was to assess working memory for faces over very short delays in patients with MTL damage. Patients and matched controls were required to remember one face that was parametrically morphed to be more or less similar to a probe face, over either a 1- or an 8-sec delay. Memory was assessed using both forced choice and old-new recognition tasks. The results show that MTL damage impairs both speed and accuracy of visual working memory across tasks. We speculate that the hippocampus is generally necessary for memory encoding.     

Viewing the world through “blood-red tinted glasses”: The hostile expectation bias mediates the link between violent video game exposure and aggression

Research has clearly shown that violent video games can increase aggression. It is less clear why they do. This study investigates the mediating effect of the hostile expectation bias (i.e., tendency to perceive hostile intent on the part of others) on the link between violent video game exposure and aggression. French college students (N = 136) played either a violent or nonviolent game for 20 minutes. Afterwards, they read ambiguous story stems about potential interpersonal conflicts, and listed what they thought the main characters would do or say, think, and feel as the story continued. Aggression was measured using a competitive computer game in which the winner could blast the loser with loud noise through headphones. As hypothesized, video game violence increased the hostile expectation bias, which, in turn, increased aggression. Effects were larger for men than women. Thus one reason why violent games increase aggression is because they increase hostile expectations.     

Defining Compulsive Behavior

Neuropsychology Review - Compulsive tendencies are a central feature of problematic human behavior and thereby are of great interest to the scientific and clinical community. However, no consensus...     

Screw misfit dislocations perpendicular to one or two free surfaces

ABSTRACT

When a screw dislocation pierces one or two free surface(s), noticeable elastic relaxation takes place nearby these surfaces. To refine the theoretical interpretation of an electron microscopy image this relaxation should be included in a precise imaging model. In the present work, the relaxation field is evaluated for a periodic set of misfit screw dislocations normal to the free surface of a semi-infinite or plate-like heterogeneous bicrystal. The proposed approach uses an appropriate combination of known biperiodic elastic fields. For a homogeneous medium and when the period increases, the results around a misfit screw dislocation converge to those of Eshelby and Stroh (1951) who considered an isolated translation screw dislocation.     

Effects of an Islamic-based gratitude strategy on Muslim students’ level of happiness

This study examined the effects of an Islamic-based expressive gratitude strategy in comparison to a secular-based expressive gratitude strategy and a control group in enhancing Muslims’ level of happiness. It was hypothesised that practising the Islamic-based gratitude exercise (by associating blessings with Allah) would result in higher happiness level over time, compared to the happiness level of Muslim participants practising the secular-based gratitude exercise (without specific association) or the control group (attending to details of daily life). Sixty students were randomly assigned into one of three groups and over a period of 16 days were asked to practise the respective exercises daily. They were assessed for pre- and post-happiness measures. Results generally supported the hypothesis, and suggested that the Islamic-based gratitude is beneficial in raising participants’ happiness level, as it fits with their beliefs and values. Implications of the results for including Islamic-oriented intervention to promote Muslim happiness are discussed.     

What constitutes an episode in episodic memory?

The idea of episodic memory implies the existence of a process that segments experience into episodes so that they can be stored in memory. It is therefore surprising that the link between event segmentation and the organization of experiences into episodes in memory has not been addressed. We found that after participants read narratives containing temporal event boundaries at varying locations in the narrative, their long-term associative memory for information across event boundaries was lower than their memory for information within an event. This suggests that event segmentation during encoding resulted in segmentation of those same events in memory. Further, functional imaging data revealed that, across participants, brain activity consistent with the ongoing integration of information within events correlated with this pattern of mnemonic segmentation. These data are the first to address the mechanisms that support the organization of experiences into episodes in long-term memory.     

An Emotion Regulation Treatment for Young People With Complex Substance Use and Mental Health Issues: A Case-Series Analysis

Individuals accessing treatment within the youth alcohol and other drug (AoD) sector represent a highly vulnerable population who present with complex patterns of substance use and mental health comorbidity. Current treatments often fail to address this complexity. Emotion regulation (ER) has been identified as a promising transdiagnostic treatment target for this population of young people. The current study aimed to investigate the acceptability and feasibility of an adjunct ER intervention, ERIC (Emotion Regulation and Impulse Control) in young people receiving AoD treatment at a residential rehabilitation service. A mixed methods case series design was utilized. Ten participants aged between 16–20 years old completed 4–6 sessions of ERIC as an adjunct to their existing residential treatment. Participants undertook a post intervention feedback session and completed a number of self-report measures of ER, depression and anxiety at baseline and 2 weeks after receiving ERIC. Qualitative feedback from young people following the delivery of ERIC was positive, and suggested that ERIC was a viable and useful intervention. Participants reported that the components of ERIC, which involved metaphors and experiential exercises, were particularly beneficial and memorable. Pre-post measures indicated that 60% of the young people had both reliable and clinically significant reductions in overall emotion dysregulation, while reliable and clinically significant reductions in depression and anxiety were observed in 50% and 60% of participants respectively. Results support the acceptability of ERIC for this cohort of young people with complex substance use and mental health needs. Furthermore, these findings support the viability of delivering flexible and adjunctive ER treatments to young people seeking AoD treatment.