Adaptation in Visuomanual Tracking Depends on Intact Proprioception

The role of arm proprioception in motor learning was investigated in experiments in which, by moving the arm, subjects followed the motion of a target displayed on a monitor screen. Adaptive capabilities were tested in visuomanual tracking tasks following alterations in the relationship between the observer's actual arm movement and visual feedback of the arm movement given by a cursor motion on the screen. Tracking performance and adaptive changes, measured in terms of spatiotemporal error, tracking trajectory curvature, and spatial gain, were compared in 7 control subjects (CSs) and in 1 deafferented subject (DS). CSs adapted appropriately to altered visuomanual relationships; those changes were present in trials immediately after restoration of normal scaling. In contrast, although the DS modified his tracking strategy from trial to trial according to the altered conditions, he did not show plastic changes in internal visuomanual scaling. Like the results of prismatic adaptation experiments, the present results suggest that arm proprioception contributes to the plastic changes that follow alterations in the scaling of visuomanual gain.     

Wings of desire: Reflections on sexual desire,identity and freedom

The aim of this paper is to give a critical discussion of Sartre’s concept of sexual desire and its relation to self-identity and freedom. Why Sartre? Sartre is one of very few philosophers who offers a systematic account of sexual desire. He has influenced eminent philosophical concepts of sexual desire held by, for instance, de Beauvoir, Lacan, Foucault, Levinas, Irigaray and Butler, but not much is written about his own notion of sexual desire. This alone is reason to explore Sartre’s view. What makes his view of sexual desire particularly interesting is that it is framed by his theory of freedom. Sartre offers the original, radical notion that freedom is absolute. Because consciousness is never self-identical, he argues, human identity is not fixed. Instead, we are consequently nothing else but what we keep desiring to make of ourselves. He concludes that we are always free to choose our drives and desires, even what seem to be our most enslaving, natural sexual instincts. The question raised in this article, however, concerns what the nature of sexual desire is and how free we really are to choose our sexual desires. I first contextualise Sartre’s view of sexual desire within his notion of desire in general and its relation to instinct, drive, consciousness, freedom and identity. Then, I give a detailed discussion of his analysis of sexual desire, its relation to freedom, and, what Sartre calls its failures. Finally, I discuss a critique of, and alternative to, Sartre’s theory of sexual desire from the perspective of my own notion of heteronomous and autonomous desire and freedom.     

French Validation of the Overexcitability Questionnaire 2: Psychometric Properties and Factorial Structure

Overexcitability corresponds to an overall response to stimulations in 5 domains: psychomotor, sensual, intellectual, imaginational, and emotional. The aim of this study was to develop a French version of the Overexcitability Questionnaire 2 (OEQ2) and to expand its psychometric properties. Two studies were conducted: one with a sample of 474 adolescents and another with a sample of 436 adults. Internal consistency, factorial structure, and validity (correlations with intelligence, personality, and alexithymia) were examined. The French OEQ2 showed satisfactory psychometric properties, thus advocating for its use in further research on overexcitability and in clinical practice.     

Individuation training with other‐race faces reduces preschoolers’ implicit racial bias: a link between perceptual and social representation of faces in children

The present study examined whether perceptual individuation training with other‐race faces could reduce preschool children's implicit racial bias. We used an ‘angry = outgroup’ paradigm to measure Chinese children's implicit racial bias against African individuals before and after training. In Experiment 1, children between 4 and 6 years were presented with angry or happy racially ambiguous faces that were morphed between Chinese and African faces. Initially, Chinese children demonstrated implicit racial bias: they categorized happy racially ambiguous faces as own‐race (Chinese) and angry racially ambiguous faces as other‐race (African). Then, the children participated in a training session where they learned to individuate African faces. Children's implicit racial bias was significantly reduced after training relative to that before training. Experiment 2 used the same procedure as Experiment 1, except that Chinese children were trained with own‐race Chinese faces. These children did not display a significant reduction in implicit racial bias. Our results demonstrate that early implicit racial bias can be reduced by presenting children with other‐race face individuation training, and support a linkage between perceptual and social representations of face information in children.     

Heidegger in the township

Imagine Heidegger in a township. Imagine you are able to translate his concept of ‘care’ to ‘the people’. Would they agree that in their ordinary experience people care? I argue not and contend that, instead, they would choose the term ‘struggle’. I analyse experiential aspects of ordinary life in the context of the township, which involves a significant part of people around the world, in order to argue that, at least in such contexts, it is a more common experience for people to struggle than to care. In this way I hope to show how a phenomenological analysis of everyday life experience such as Heidegger's can contribute to the understanding of contextual issues, but also how a context can induce the introduction of new concepts of thinking.     

Improving communicative understanding: The benefits of global processing

The current research investigated whether a global processing style, affording a focus on the broader context, promotes communicative understanding and, in turn, communicative success. Results confirmed that compared to priming local processing, priming global processing enhanced the deciphering of potentially sarcastic statements of which participants were the receivers (Experiment 1). Experiment 2 extended these findings to oral communication: Global processing increased the correct deciphering of meanings that speakers’ attempted to convey by ambiguous sentences to listeners. Overall ‘seeing the forest instead of the trees’ allowed receivers to attend more perceptively to the larger communicative context, thereby facilitating successful communication.     

Hippocampal train stimulation modulates recall of fear extinction independently of prefrontal cortex synaptic plasticity and lesions

It has been shown that long-term potentiation (LTP) develops in the connection between the mediodorsal thalamus (MD) and the medial prefrontal cortex (mPFC) and between the hippocampus (HPC) and the mPFC following fear extinction, and correlates with extinction retention. However, recent lesion studies have shown that combined lesions of the MD and mPFC do not interfere with extinction learning and retention, while inactivation of the dorsal HPC disrupts fear extinction memory. Here we found in rats that immediate post-training HPC low-frequency stimulation (LFS) suppressed extinction-related LTP in the HPC-mPFC pathway and induced difficulties in extinction recall. HPC tetanus, applied several hours later, failed to re-establish mPFC LTP but facilitated recall of extinction. Delayed post-training HPC LFS also provoked mPFC depotentiation and difficulties with extinction recall. HPC tetanus abolished these two effects. We also found that damage to the mPFC induced fear return only in rats that received HPC LFS following extinction training. HPC tetanus also reversed this behavioral effect of HPC LFS in lesioned rats. These data suggest that the HPC interacts with the mPFC during fear extinction, but can modulate fear extinction independently of this interaction.