Speech-associated gestures, Broca’s area, and the human mirror system

Speech-associated gestures are hand and arm movements that not only convey semantic information to listeners but are themselves actions. Broca’s area has been assumed to play an important role both in semantic retrieval or selection (as part of a language comprehension system) and in action recognition (as part of a “mirror” or “observation–execution matching” system). We asked whether the role that Broca’s area plays in processing speech-associated gestures is consistent with the semantic retrieval/selection account (predicting relatively weak interactions between Broca’s area and other cortical areas because the meaningful information that speech-associated gestures convey reduces semantic ambiguity and thus reduces the need for semantic retrieval/selection) or the action recognition account (predicting strong interactions between Broca’s area and other cortical areas because speech-associated gestures are goal-direct actions that are “mirrored”). We compared the functional connectivity of Broca’s area with other cortical areas when participants listened to stories while watching meaningful speech-associated gestures, speech-irrelevant self-grooming hand movements, or no hand movements. A network analysis of neuroimaging data showed that interactions involving Broca’s area and other cortical areas were weakest when spoken language was accompanied by meaningful speech-associated gestures, and strongest when spoken language was accompanied by self-grooming hand movements or by no hand movements at all. Results are discussed with respect to the role that the human mirror system plays in processing speech-associated movements.     

Efficiency and accuracy of visual search develop at different rates from early childhood through early adulthood

Psychonomic Bulletin & Review - Most studies of visual search across the life span have focused on classic feature and conjunction searches in which observers search for a fixed, simple shape...     

Delay discounting of different outcomes: Review and theory

Steep delay discounting is characterized by a preference for small immediate outcomes relative to larger delayed outcomes and is predictive of drug abuse, risky sexual behaviors, and other maladaptive behaviors. Nancy M. Petry was a pioneer in delay discounting research who demonstrated that people discount delayed monetary gains less steeply than they discount substances with abuse liability. Subsequent research found steep discounting for not only drugs, but other nonmonetary outcomes such as food, sex, and health. In this systematic review, we evaluate the hypotheses proposed to explain differences in discounting as a function of the type of outcome and explore the trait- and state-like nature of delay discounting. We found overwhelming evidence for the state-like quality of delay discounting: Consistent with Petry and others' work, nonmonetary outcomes are discounted more steeply than monetary outcomes. We propose two hypotheses that together may account for this effect: Decreasing Future Preference and Decreasing Future Worth. We also found clear evidence that delay discounting has trait-like qualities: People who steeply discount monetary outcomes steeply discount nonmonetary outcomes as well. The implication is that changing delay discounting for one outcome could change discounting for other outcomes.     

Reading Stories Activates Neural Representations of Visual and Motor Experiences

ABSTRACT— To understand and remember stories, readers integrate their knowledge of the world with information in the text. Here we present functional neuroimaging evidence that neural systems track changes in the situation described by a story. Different brain regions track different aspects of a story, such as a character's physical location or current goals. Some of these regions mirror those involved when people perform, imagine, or observe similar real-world activities. These results support the view that readers understand a story by simulating the events in the story world and updating their simulation when features of that world change.     

Understanding Exercise Dependence

Exercise dependence represents a condition in which an individual exercises excessively, often to the detriment of his or her physical and psychological health and wellbeing. Despite substantial investigation of this phenomenon, researchers have only recently developed conceptually sound diagnostic criteria for exercise dependence, and have yet to determine a suitably convincing mechanism or explanation for its onset and development. Likewise, researchers have not assessed whether therapies considered effective for other behavioural dependencies (e.g. internet or gambling addictions) are useful in the treatment of exercise dependence. With these limitations in mind, the present paper seeks to develop a conceptual basis for exercise dependence, critically review a representative portion of the exercise dependence literature, examine theories describing potential mechanisms for its development and onset, and provide recommendations for clinicians regarding the recognition, diagnosis, treatment, and prevention of exercise dependence.     

Advice for fallibilists: put knowledge to work

We begin by asking what fallibilism about knowledge is, distinguishing several conceptions of fallibilism and giving reason to accept what we call strong epistemic fallibilism, the view that one can know that something is the case even if there remains an epistemic chance, for one, that it is not the case. The task of the paper, then, concerns how best to defend this sort of fallibilism from the objection that it is “mad,” that it licenses absurd claims such as “I know that p but there’s a chance that not p” and “p but it there’s a chance that not p.” We argue that the best defense of fallibilism against this objection—a “pragmatist” defense—makes the following claims. First, while knowledge that p is compatible with an epistemic chance that not-p, it is compatible only with an insignificant such chance. Second, the insignificance of the chance that not-p is plausibly understood in terms of the irrelevance of that chance to p’s serving as a ‘justifier’, for action as well as belief. In other words, if you know that p, then any chance for you that not p doesn’t stand in the way of p’s being properly put to work as a basis for action and belief.

Roles of moral philosophy in appropriated bioethics: a response to Baker and McCullough

Strong arguments support the notion that much of modern bioethics is a result of appropriation rather than strict application of traditional moral philosophy. Nevertheless, it is important to recognize these sources and approaches associated with them, even when working with appropriated theories, since traditional ethical theory does and should influence modern bioethics.     

How do women experience myocardial infarction? A qualitative exploration of illness perceptions, adjustment and coping

While UK Department of Health policy recognizes the importance of secondary prevention and rehabilitation following a cardiac event, there still appears a dearth of research addressing women's needs. This study aimed to explore adjustment in terms of women's perception of their cardiac event, impact on relationships and coping strategies employed. Five women suffering first time MI were interviewed, using a semi-structured format and were telephoned 2 months later. Data were analysed using Interpretative Phenomenological Analysis. Perceptions included: Making Sense of the Event, Cognitive and Emotional Responses and Self-beliefs. Relationships issues were: Others' Reactions and Change in Relationships and Roles. Cognitive and Behavioural strategies and Support from others (including cardiac rehabilitation) formed coping strategies. For most participants, the event was unexpected evoking uncertainty and later, emotions extending beyond the more widely accepted depression and anxiety. Women tended to minimize severity of symptoms and impact of event (perhaps as a way of coping and protecting others), displaying a strong sense of optimism and hope that life would soon return to "normal". However, it appeared this was difficult to maintain and the experience seemed to challenge relationships and roles. The findings suggest recommendations for further research with possible implications for clinical practice.     

Reaction time inconsistency in a spatial stroop task: age-related differences through childhood and adulthood

Age-related differences in inconsistency of reaction time (RT) across the life span were examined on a task with differing levels of demand on executive control. A total of 546 participants, aged 5 to 76 years, completed a spatial Stroop task that permitted observations under three conditions (congruent, incongruent, and neutral) according to the correspondence between the required response (based on stimulus direction) and stimulus location. An interference effect was observed across all ages. Analyses of neutral condition data replicated previous research demonstrating RT inconsistency follows a U-shaped developmental curve across the life span. The relationship between age and inconsistency, however, depended on condition: inconsistency in the congruent condition was higher than inconsistency in both the neutral and incongruent conditions across middle-aged groups. Reaction time inconsistency may reflect processing efficiency that is maximal in young adulthood and may also be sensitive to fluctuations in performance that reflect momentarily highly efficient responding.