Long-term memory for performed and observed actions: Retrieval awareness and source monitoring

The self-performed task (SPT) paradigm was employed to investigate incidental memory for action events, focusing on states of awareness at retrieval (Remembering–Knowing) and source monitoring in performed and observed actions, at delays of 1 and 2 weeks. Recognition was better for performed than observed actions, but this effect was visible only after 1 week of retention. Conversely, observed actions were associated with better source memory at both delays. When the source was correctly identified, performed and observed actions were accompanied by equal proportions of Remember judgements. However, when source monitoring was incorrect, performed actions were more frequently associated with a feeling of re-experiencing the original event, thus suggesting an enactment-related recollective superiority, although secondary to the availability of reliable contextual information.     

How much does the human medial gastrocnemius muscle contribute to ankle torques outside the sagittal plane?

Ankle movements in the frontal plane are less prominent though not less relevant than movements in the plantar or dorsal flexion direction. Walking on uneven terrains and standing on narrow stances are examples of circumstances likely imposing marked demands on the ankle medio-lateral stabilization. Following our previous evidence associating lateral bodily sways in quiet standing to activation of the medial gastrocnemius (MG) muscle, in this study we ask: how large is the MG contribution to ankle torque in the frontal plane? By arranging stimulation electrodes in a selective configuration, current pulses were applied primarily to the MG nerve branch of ten subjects. The contribution of populations of MG motor units of progressively smaller recruitment threshold to ankle torque was evaluated by increasing the stimulation amplitude by fixed amounts. From smallest intensities (12–32 mA) leading to the firstly observable MG twitches in force-plate recordings, current pulses reached intensities (56–90 mA) below which twitches in other muscles could not be observed from the skin. Key results showed a substantial MG torque contribution tending to rotate upward the foot medial aspect (ankle inversion). Nerve stimulation further revealed a linear relationship between the peak torque of ankle plantar flexion and inversion, across participants (Pearson R > .81, p < .01). Specifically, regardless of the current intensity applied, the peak torque of ankle inversion amounted to about 13% of plantar flexion peak torque. Physiologically, these results provide experimental evidence that MG activation may contribute to stabilize the body in the frontal plane, especially under situations of challenged stability.     

Perversion: a clinical possibility

Abstract

Clinical work with perverse patients presents numerous difficulties to psychoanalysis, be that due to the characteristics typical of the perverse structure, which is founded on the mechanism of disavowal, or to the inefficiency of neutrality and free association in this kind of practice. A study of existing literature on the subject and a thorough examination of their own clinical findings led the authors to propose a different kind of strategy for dealing with transference that would make clinical work with these patients plausible and indicate options for the paralyzing position that is imposed on the analyst by the perverse patient in order to derange the analytic process. By proposing an alternative for the “semblance subject-supposed-knowledge,” the authors defend the idea that clinical work with perverse patients is possible, resulting in a subject less captive of the phantasmagoric scene.

Drummond S et al. Perversion: eine klinische Möglichkeit

Klinische Arbeit mit perversen Patienten bildet zahlreiche Schwierigkeiten für die Psychoanalyse, sei es wegen der Eigenart der perversen Struktur, welche durch den Mechanismus der Verleugnung begründet wird oder sei es wegen der Ineffektivität der Neutralität und freien Assoziation bei dieser Art von Praxis. Ein Studium der vorhandenen Literatur über das Thema und eine gründliche Überprüfung eigener klinischer Befunde führte die Autoren dazu, eine unterschiedliche Art von Strategie des Umgangs mit Übertragung vorzuschlagen. Das würde klinische Arbeit mit diesen Patienten plausibel machen und auf Optionen für die paralysierende Position hinweisen, die dem Analytiker durch den perversen Patienten aufgebürdet wird, um den analytischen Prozess zu stören. Ein Alternative für das “semblance subject-supposed knowledge” vorschlagend, verteidigen die Autoren die Idee, daß klinische Arbeit mit perversen Patienten möglich ist, mit dem Ergebnis eines Subjekts, welches weniger durch die phantasmagorische Szene gefesselt ist.

Drummond S et al. perversión: una posibilidad clínica.

El trabajo clínico con pacientes perversos presenta numerosas dificultades para el psicoanálisis, puede ser debido a las características típicas de la estructura perversa, fundamentado en le mecanismo de repudio, o debido a la ineficacia de la neutralidad y asociación libre en este tipo de práctica. Un estudio de la literatura existente sobre el tema y un examen completo de los hallazgos clínicos, llevó a los autores a proponer un tipo diferente de estrategia para el manejo de la transferencia, que pudiera hacer posible el trabajo clínico con estos pacientes, también indicar opciones para la situación de paralización que estos pacientes imponen al analista para desorganizar el proceso analítico. Con la proposición de una alternativa para la “semblance-subject-supposed knowledge(apariencia del sujeto-supuesto saber),” el autor defiende la idea de que el trabajo clínico con pacientes perversos es posible, resultando un asunto menos cautivo de la escena fantasmagórica.     

Sensori-motor integration during stance: Time adaptation of control mechanisms on adding or removing vision

Sudden addition or removal of visual information can be particularly critical to balance control. The promptness of adaptation of stance control mechanisms is quantified by the latency at which body oscillation and postural muscle activity vary after a shift in visual condition. In the present study, volunteers stood on a force platform with feet parallel or in tandem. Shifts in visual condition were produced by electronic spectacles. Ground reaction force (center of foot pressure, CoP) and EMG of leg postural muscles were acquired, and latency of CoP and EMG changes estimated by t-tests on the averaged traces. Time-to-reach steady-state was estimated by means of an exponential model. On allowing or occluding vision, decrements and increments in CoP position and oscillation occurred within about 2 s. These were preceded by changes in muscle activity, regardless of visual-shift direction, foot position or front or rear leg in tandem. These time intervals were longer than simple reaction-time responses. The time course of recovery to steady-state was about 3 s, shorter for oscillation than position. The capacity of modifying balance control at very short intervals both during quiet standing and under more critical balance conditions speaks in favor of a necessary coupling between vision, postural reference, and postural muscle activity, and of the swiftness of this sensory reweighing process.     

Exaggerated NMDA mediated LTD in a mouse model of Down syndrome and pharmacological rescuing by memantine

The Ts65Dn mouse is the best-studied animal model for Down syndrome. In the experiments described here, NMDA-mediated or mGluR-mediated LTD was induced in the CA1 region of hippocampal slices from Ts65Dn and euploid control mice by bath application of 20 μM NMDA for 3 min and 50 μM DHPG for 5 min, respectively. We found that Ts65Dn mice display exaggerated NMDA-induced, but not mGluR-induced, LTD in the CA1 region of the hippocampus compared with euploid control animals. In addition, this abnormal level of LTD can be pharmacologically rescued by the NMDA receptor antagonist memantine.     

Jews in the diaspora with <Emphasis Type="Italic">Sepharad</Emphasis> in the mirror: ruptures,relations, and forms of identity: a theme examined through three cases

Recent historiography has led to a reevaluation of the diachronic paradigm that undergirds the classic story of Iberian Jews and conversos. In line with that reevaluation, this article investigates what motivated diasporic Sephardim, especially ones with cultural and other ties to Portugal, to conserve elements of an identity that pointed to their Iberian past, such as the Portuguese and Castilian languages, as well as what one might call “Ibero-conscious” forms of self-identification. What benefits, beyond expressing a nostalgic and otherwise emotive sensibility, could accrue from the retention of these forms? How did they and similar forms facilitate the building internal, group cohesion on the basis of shared connections to a common past? How did the forms articulate the relations of New Christians to the Iberian countries and to the Iberian Empires? To reflect on these and related questions, which focus on the continuity of ties between diasporic Jews and the Iberian Peninsula, we analyze here various temporally and geographically distinct cases: The case of the converso financier and politican Joseph Nasi (formerly João Micas); the case of the Sephardi convert and anti-Jewish polemicist, João Baptista D’Este (formerly Abraham Bendanan Serfatim); and the case of Portuguese Jews in Salé, Morocco, whose wide-ranging relations with the Portuguese Jews Community of Amsterdam and with Christian Dutchmen made for complex phenomena of identity-construction.     

Lost in the move? Secondary task performance impairs tactile change detection on the body

Change blindness, the surprising inability of people to detect significant changes between consecutively-presented visual displays, has recently been shown to affect tactile perception as well. Visual change blindness has been observed during saccades and eye blinks, conditions under which people’s awareness of visual information is temporarily suppressed. In the present study, we demonstrate change blindness for suprathreshold tactile stimuli resulting from the execution of a secondary task requiring bodily movement. In Experiment 1, the ability of participants to detect changes between two sequentially-presented vibrotactile patterns delivered on their arms and legs was compared while they performed a secondary task consisting of either the execution of a movement with the right arm toward a visual target or the verbal identification of the target side. The results demonstrated that a motor response gave rise to the largest drop in perceptual sensitivity (as measured by changes in d′) in detecting changes to the tactile display. In Experiment 2, we replicated these results under conditions in which the participants had to detect tactile changes while turning a steering wheel instead. These findings are discussed in terms of the role played by bodily movements, sensory suppression, and higher order information processing in modulating people’s awareness of tactile information across the body surface.     

When hoarding is a symptom of OCD: A case series and implications for DSM-V

Hoarding, the excessive collection and failure to discard objects of apparently little value, can represent a serious psychiatric problem and pose a threat to public health. Hoarding has traditionally been considered a symptom (or symptom dimension) of Obsessive-Compulsive Disorder (OCD), but its nosological status has recently been debated. Mounting evidence suggests that, once other primary causes are ruled out, hoarding may be a discrete diagnostic entity, recently named Hoarding Disorder. However, hoarding can sometimes be a genuine OCD symptom. This can be confusing and clinicians may sometimes struggle making the differential diagnosis. To illustrate this, we describe 10 OCD patients with severe hoarding behavior that is better conceptualized as a symptom of OCD. We focus on the motivations for hoarding and the overlapping of hoarding with other obsessive-compulsive symptom dimensions. We estimate that this clinical presentation is relatively rare and accounts for a minority of severe hoarding cases. We discuss the unique characteristics of hoarding as a symptom of OCD and the implications for DSM-V.     

Temporal preparation,response inhibition and impulsivity

Temporal preparation and impulsivity involve overlapping neural structures (prefrontal cortex) and cognitive functions (response inhibition and time perception), however, their interrelations had not been investigated. We studied such interrelations by comparing the performance of groups with low vs. high non-clinical trait impulsivity during a temporal preparation go no-go task. This task measured, in less than 10 min, how response inhibition was influenced both by temporal orienting of attention (guided by predictive temporal cues) and by sequential effects (produced by repetition/alternation of the duration of preparatory intervals in consecutive trials). The results showed that sequential effects produced dissociable patterns of temporal preparation as a function of impulsivity. Sequential effects facilitated both response speed (reaction times – RTs – to the go condition) and response inhibition (false alarms to the no-go condition) selectively in the low impulsivity group. In the high impulsivity group, in contrast, sequential effects only improved RTs but not response inhibition. We concluded that both excitatory and inhibitory processing may be enhanced concurrently by sequential effects, which enables the temporal preparation of fast and controlled responses. Impulsivity could hence be related to less efficient temporal preparation of that inhibitory processing.     

Risk and protective factors at school: Reducing bullies and promoting positive bystanders' behaviors in adolescence

Identifying protective factors present at schools located in neighborhoods with high structural violence is fundamental to help prevent the perpetuation of violence . Therefore, the aim of this study was to observe how some school micro‐system variables, such as school environment and interpersonal relationships that adults establish with adolescents, may lead to bullying behaviors or, on the contrary, to positive bystander behavior in the bully‐victim dynamic. The sample was composed of 5,774 adolescents from 71 schools located in violent neighborhoods in Lima (Peru). 31.9 per cent of the sample experienced verbal violence and the prevalence of cyberbullying was 24.6%. Boys were more prone to experience both types of bullying than girls, although no differences were seen in the probability of becoming aggressors during early and late adolescence. The protective model showed that a positive atmosphere based on a supportive environment with clear rules encouraged adults at school to show more support and to provide more orientation in bullying situations, thus promoting a positive bystander behavior between peers. Opposite results were observed in the risk model. Actions at the micro‐system school level are discussed to enhance protective factors and reduce risk factors.