Multimodal Ternus: visual, tactile, and visuo-tactile grouping in apparent motion

Gestalt rules that describe how visual stimuli are grouped also apply to sounds, but it is unknown if the Gestalt rules also apply to tactile or uniquely multimodal stimuli. To investigate these rules, we used lights, touches, and a combination of lights and touches, arranged in a classic Ternus configuration. Three stimuli (A, B, C) were arranged in a row across three fingers. A and B were presented for 50 ms and, after a delay, B and C were presented for 50 ms. Subjects were asked whether they perceived AB moving to BC (group motion) or A moving to C (element motion). For all three types of stimuli, at short delays, A to C dominated, while at longer delays AB to BC dominated. The critical delay, where perception changed from group to element motion, was significantly different for the visual Ternus (3 lights, 162 ms) and the tactile Ternus (3 touches, 195 ms). The critical delay for the multimodal Ternus (3 light-touch pairs, 161 ms) was not different from the visual or tactile Ternus effects. In a second experiment, subjects were exposed to 2.5 min of visual group motion (stimulus onset asynchrony = 300 ms). The exposure caused a shift in the critical delay of the visual Ternus, a trend in the same direction for the multimodal Ternus, but no shift in the tactile Ternus. These results suggest separate but similar grouping rules for visual, tactile, and multimodal stimuli.     

Psychogenic Nonepileptic Seizures

Neurological, neurodiagnostic, and neuropsychological aspects of psychogenic nonepileptic seizures (PNES) are reviewed, including psychosocial, psychiatric, cognitive, and MMPI-2 findings.     

Basic numerical skills in children with mathematics learning disabilities: a comparison of symbolic vs non-symbolic number magnitude processing

Forty-five children with mathematics learning disabilities, with and without comorbid reading disabilities, were compared to 45 normally achieving peers in tasks assessing basic numerical skills. Children with mathematics disabilities were only impaired when comparing Arabic digits (i.e., symbolic number magnitude) but not when comparing collections (i.e., non-symbolic number magnitude). Moreover, they automatically processed number magnitude when comparing the physical size of Arabic digits in an Stroop paradigm adapted for processing speed differences. Finally, no evidence was found for differential patterns of performance between MD and MD/RD children in these tasks. These findings suggest that children with mathematics learning disabilities have difficulty in accessing number magnitude from symbols rather than in processing numerosity per se.     

After Heidegger: Transubstantiation

Recent debate over transubstantiation (especially Jean‐Luc Marion's defence of it) has concentrated either on transubstantiation as a kind of embarrassment in consequence of modern physics, or on the extent to which it is both a doctrine elaborated in the light of metaphysics and recoverable in consequence of metaphysics having been overcome. In this sense the tension between Aquinas' apparently metaphysical formulation of the doctrine and the less overtly metaphysical formula adopted by the Council of Trent (in its refusal to speak of ‘accidents’) has indicated a way of ‘rescuing’ or ‘recovering’ the doctrine. This article argues that such a recovery is a false trail. Pope Paul VI was right to be wary of relativising the Eucharistic event to the believing community in any doctrine of transignification. Alternatively, attempts like Chauvet's and Macquarrie's to restate Eucharistic event in terms of Heidegger's Geviert presuppose Heidegger has succeeded in destroying the metaphysics of presence, so that they can use the fruits of his researches. What is actually at issue in thinking through transubstantiation is how the doctrine relates to conceptions of the physical: Aristotelian, what comes to be Newtonian, or postmodern conceptions which appear to eschew physics altogether. Heidegger's contribution to the debate would better point to how knowing anything means being included in and (self‐) disclosed by what I know. A re‐investigation of transubstantiation might therefore take into account the extraordinary reappearance of the term ‘transubstantiation’ in current non‐theological investigations of performativity (especially in the work of Judith Butler). Here transubstantiation would include not the maximal meaning of bread and wine as signs constituted in das Geviert, ‘after’ substance has been critiqued, but their minimality, in enacting a change in (our) substance (self‐realising). This would confirm the divinising meaning of the Eucharistic event, which stresses how we are caught up into the divine. Thus, whereas in transignification the Eucharistic event occurs in consequence of the will of the community of believers, in transubstantiation it is the enactment of the community as community that is at issue, an enactment in consequence of no act of will of its own. In terms of the postmodern and non‐theological appropriation of the word transubstantiation, this means that I who participate in the Eucharistic am re‐ordered, or re‐materialised, or ‘trans‐substantiated’ in the Eucharistic event.     

Self-injury and disordered eating: expressing emotion dysregulation through the body

Previous research has suggested that emotion dysregulation, body‐related concerns, and depressive symptoms are associated with nonsuicidal self‐injury (NSSI) and disordered eating (DE) separately and in combination. However, it has been difficult to ascertain to what extent these constructs contribute to NSSI and DE given the relatively small number of studies examining their co‐occurrence, particularly among nonclinical samples. Based on responses to self‐report questionnaires, college‐aged women who completed the study were divided into three groups: NSSI only; DE only; and NSSI + DE based on clinical cutoff criteria. Results support hypotheses that emotion dysregulation is a shared vulnerability and that body‐related concerns and depression exhibit unique patterns of association across the three groups. It appears that NSSI is best understood as a response to negative affective states relative to DE, which is best understood as a set of behaviors motivated by body image concerns. The presence of both NSSI and DE is primarily influenced by emotion dysregulation and the dominant difficulties linked to each behavior; depression and body dissatisfaction. These findings suggest that treatment and prevention efforts should emphasize emotion regulation skills and differentially target body concerns or depressive symptoms according to the primary behavioral dysfunction that is present.     

Psychopathic Traits in Adolescence and the Five Factor Model of Personality

The present study aimed to expand work on psychopathic traits and the Five Factor Model (FFM; Costa and McCrae 1992). The associations between the three factors of psychopathy and personality traits—assessed by means of the Youth Psychopathic Traits Inventory (YPI, Andershed et al. 2002) and the Neuroticism, Extraversion, Openness Personality Inventory-Revised (NEO PI-R; Costa and McCrae 1992)—were explored in a community sample of 152 male adolescents and young adults. The unique relations of each YPI subscale with the NEO domains/facets were examined by computing partial correlations controlling for the scores on the other two YPI psychopathy subscales. The YPI Callous/Unemotional dimension exhibited negative associations with Extraversion, Openness, and Agreeableness. The YPI Impulsive/Irresponsible factor was positively associated with Extraversion and negatively with Conscientiousness. The YPI Grandiose/Manipulative factor displayed positive associations with Openness and Conscientiousness. We discuss the implications of the differential associations of the three psychopathy factors with the Five Factor domains/facets for theories of the etiology of psychopathy.     

Statistical decision theory and evolution

Two recent articles by Geisler and Diehl use Bayesian statistical decision theory to model the co-evolution of predator and prey in a simple, game-like environment. The prey is characterized by its coloration. The predator is characterized by the chromatic sensitivity of its visual system and its willingness to attack. The authors demonstrate how the coloration of prey and the perceptual system of the predator co-evolve, converging to a Nash equilibrium for both species.