Performance benefits of depression: sequential decision making in a healthy sample and a clinically depressed sample

Previous research reported conflicting results concerning the influence of depression on cognitive task performance. Whereas some studies reported that depression enhances performance, other studies reported negative or null effects. These discrepant findings appear to result from task variation, as well as the severity and treatment status of participant depression. To better understand these moderating factors, we study the performance of individuals-in a complex sequential decision task similar to the secretary problem-who are nondepressed, depressed, and recovering from a major depressive episode. We find that depressed individuals perform better than do nondepressed individuals. Formal modeling of participants' decision strategies suggested that acutely depressed participants had higher thresholds for accepting options and made better choices than either healthy participants or those recovering from depression.     

In the Face of Terrorism: Evidence that Belief in Literal Immortality Reduces Prejudice Under Terrorism Threat

Based on terror management theory, previous research has shown that terrorism threat increases prejudice against Muslims and is mediated by death‐related thoughts. Because this effect was found on a correlational level, it remains unclear whether terrorism threat increases prejudice against Muslims because of enhanced death‐related thoughts or the opposite: terrorism threat increases death‐related thoughts because of stronger prejudice against Muslims. To disentangle this shortcoming, we varied death‐related thoughts by systematically manipulating the belief in literal immortality. Using two studies, we found that participants exposed to terrorism pictures (vs. controls) had increased prejudice against both Muslims (Study 1) and immigrants (Study 2) when they were led to believe that literal immortality does not exist but not when they were led to believe that it does exist. Mediation analysis indicated that this effect was mediated by death‐related thoughts. This provides further evidence that terrorism threat increases prejudice because of death‐related thoughts.     

Making sense of one’s actions in an explanatory vacuum: The interpretation of nonconscious goal striving

Previous research has found that performing norm-violating behaviors based on a nonconsciously-activated goal elicits negative affect (Oettingen, Grant, Smith, Skinner, & Gollwitzer, 2006). In the present research we explored whether this negative affect is eliminated when an earlier conscious goal with congruent behavioral effects can be used to explain the norm-violating behavior. Our findings suggest that applicable conscious goals are indeed used to interpret nonconsciously-activated goal striving (Study 1), and that this interpretation occurs reflexively rather than reflectively (Study 2), with implications for interpersonal behavior (Study 3). The role of social norms, applicable conscious goals, and negative affect in the interpretation of nonconscious goal pursuit is discussed.     

Modal truthmakers and two varieties of actualism

In this paper, I distinguish between two varieties of actualism—hardcore actualism and softcore actualism—and I critically discuss Ross Cameron’s recent arguments for preferring a softcore actualist account of the truthmakers for modal truths over hardcore actualist ones. In the process, I offer some arguments for preferring the hardcore actualist account of modal truthmakers over the softcore actualist one.     

Towards a Semantics Based on the Notion of Justification

Suppose we want to take seriously the neoverificationist idea that an intuitionistic theory of meaning can be generalized in such a way as to be applicable not only to mathematical but also to empirical sentences. The paper explores some consequences of this attitude and takes some steps towards the realization of this program. The general idea is to develop a meaning theory, and consequently a formal semantics, based on the idea that knowing the meaning of a sentence is tantamount to having a criterion for establishing what is a justification for it. Section 1 motivates a requirement of epistemic transparency imposed onto justifications conceived as mental states. In Section 2, the formal notion of justification for an atomic formula is defined, in terms of the notion of cognitive state. In Section 3, the definition is extended to logically complex formulas. In Section 4, the notion of truth-ground is introduced and is used to give a definition of logical validity.     

Anatomy of the episodic buffer: a voxel-based morphometry study in patients with dementia

In 2000 Baddeley proposed the existence of a new component of working memory, the episodic buffer, which should contribute to the on-line maintenance of integrated memory traces. The author assumed that this component should be critical for immediate recall of a short story that exceeds the capacity of the phonological store. Accordingly, patients with Alzheimer's dementia (AD) should suffer of a deficit of the episodic buffer when immediate recall of a short story is impossible. On the other hand, the episodic buffer should be somewhat preserved in such patients when some IR can occur (Baddeley and Wilson, 2002). We adopted this logic for a voxel-based morphometry study. We compared the distribution of grey-matter density of two such groups of AD patients with and of a group of age-matched controls. We found that both AD groups had a significant atrophy of the left mid-hippocampus; on the other hand, the anterior part of the hippocampus was significantly more atrophic in patients who were also impaired on the immediate prose recall task. Six out of ten patients with no immediate recall were spared at "central executive" tasks. Taken together our findings suggest that the left anterior hippocampus contributes to the episodic buffer of the revised working memory model. We also suggest that the episodic buffer is somewhat independent from the central executive component of working memory.     

The effects of video game playing on attention, memory, and executive control

Expert video game players often outperform non-players on measures of basic attention and performance. Such differences might result from exposure to video games or they might reflect other group differences between those people who do or do not play video games. Recent research has suggested a causal relationship between playing action video games and improvements in a variety of visual and attentional skills (e.g., [Green, C. S., & Bavelier, D. (2003). Action video game modifies visual selective attention. Nature, 423, 534-537]). The current research sought to replicate and extend these results by examining both expert/non-gamer differences and the effects of video game playing on tasks tapping a wider range of cognitive abilities, including attention, memory, and executive control. Non-gamers played 20+ h of an action video game, a puzzle game, or a real-time strategy game. Expert gamers and non-gamers differed on a number of basic cognitive skills: experts could track objects moving at greater speeds, better detected changes to objects stored in visual short-term memory, switched more quickly from one task to another, and mentally rotated objects more efficiently. Strikingly, extensive video game practice did not substantially enhance performance for non-gamers on most cognitive tasks, although they did improve somewhat in mental rotation performance. Our results suggest that at least some differences between video game experts and non-gamers in basic cognitive performance result either from far more extensive video game experience or from pre-existing group differences in abilities that result in a self-selection effect.     

C. S. Lewis and the Rejection of the Tao

When asking about the worldview and ethics behind such stories as The Chronicles of Narnia, readers should try to understand C.S. Lewis's work in light of the Tao or moral Natural Law. Even though our modern culture affirms a relativism in values, Lewis affirms a non-relativist universal ground for moral judgment. Lewis's theological work, Mere Christianity, provides the clue for this interpretation. Despite the apparent negativity or violence in even some of the most memorable scenes in the Chronicles, the underlying moral is hopeful and positive, reflecting a 'mere Christian' worldview.     

Elaborating the police perspective: The role of perceptions and experience in the explanation of crowd conflict

Classical theories of crowd behaviour view crowd conflict as deriving from the pathology of the crowd itself. Recent developments in crowd psychology as the elaborated social identity model (ESIM) conceptualize crowd behaviour as a dynamic intergroup process between demonstrators and police. The present study assessed exposure to crowd conflict, adherence to classical views of crowd behaviour, public order policing methods and attributions of responsibility for crowd conflict among 352 Italian police officers. Results showed that exposure to crowd conflict was related to adherence to classical views of crowd, which, in turn, was related to ‘bad practices’ of public order policing and to system‐justificatory attributions. Overall, these results offer support and extend the police perspective within the ESIM model. Practical implications for public order policing strategies and training are also discussed. Copyright © 2009 John Wiley & Sons, Ltd.