Being Present In Space: The Role Of Allocentric And Egocentric Reference Frames.

The general aim of the present study was to investigate the effect of an interactive aerial view of the experienced environment during the encoding and retrieving of spatial information on the feeling of presence. Our findings showed that this real-time interactive aerial view (both small and large) during the encoding and retrieval of spatial information seems to led to a greater sense of presence. It is argued that the use of this aerial view, which provides a real-time allocentric viewpoint-dependent spatial representation, would ease the translation of a stored allocentric representation into an egocentric one, and this process, consequently, would help individuals to feel present in space.

The rice CK2 kinase regulates trafficking of phosphate transporters in response to phosphate levels.

Phosphate transporters (PTs) mediate phosphorus uptake and are regulated at the transcriptional and posttranslational levels. In one key mechanism of posttranslational regulation, phosphorylation of PTs affects their trafficking from the endoplasmic reticulum (ER) to the plasma membrane. However, the kinase(s) mediating PT phosphorylation and the mechanism leading to ER retention of phosphorylated PTs remain unclear.

The Center for Epidemiologic Studies Depression Scale: factor validity and reliability in a French sample of adolescents with Intellectual Disability.

The purpose of this study was to test the factor validity and reliability of the Center for Epidemiologic Studies Depression Scale (CES-D) within a sample of adolescents with mild to moderate Intellectual Disability (ID). A total sample of 189 adolescents (121 boys and 68 girls), aged between 12 and 18 years old, with mild to moderate ID were involved in two studies. In study 1, the content, phrasing and answering format of the CES-D were adapted for adolescents with ID.

The intellectual disability version of the very short form of the physical self-inventory (PSI-VS-ID): cross-validation and measurement invariance across gender, weight, age and intellectual disability level.

Recently Maïano, Bégarie, Morin, and Ninot (2009) developed and validated an intellectual disability (ID) version of the very short form of the physical self-inventory (PSI-VS-ID). In a recent review of the various physical self-concept instruments Marsh and Cheng (in press) noted that the short and very short versions of the French PSI represent an important contribution to applied research but that further research was needed to investigate the robustness of their psychometric properties in new and diversified samples. Thus, this study is specifically designed to investigate the robustness of the PSI-VS-ID psychometric properties in a new independent sample of 248 adolescents and young adults with ID.

Regional differences in the listener's phonemic inventory affect semantic processing: A mismatch negativity (MMN) study.

Using the mismatch negativity (MMN) response, we examined how Standard French and Southern French speakers access the meaning of words ending in /e/ or /ε/ vowels which are contrastive in Standard French but not in Southern French. In Standard French speakers, there was a significant difference in the amplitude of the brain response after the deviant-minus-standard subtraction between the frontocentral (FC) and right lateral (RL) recording sites for the final-/ε/ word but not the final-/e/ word. In contrast, the difference in the amplitude of the brain response between the FC and RL recording sites did not significantly vary as a function of the word's final vowel in Southern French speakers.

Prevalence of eating disorders symptoms in nonelite ballet dancers and basketball players: An exploratory and controlled study among French adolescent girls.

Background: Until recently, very few controlled studies have examined the prevalence of eating disorders (ED) symptoms among nonelite adolescent female athletes. Moreover, results are mixed and inconclusive. Therefore, the aim of this exploratory study was to examine the prevalence of ED symptoms (underweight, bulimia, drive for thinness, body dissatisfaction) among French nonelite adolescent female athletes (ballet dancers and basketball players) and nonathletes.

Prevalence and risk factors of overweight and obesity among children and adolescents with intellectual disabilities.

Recent literature reviews showed that overweight and obesity represent a major health threat in adults with intellectual disability (ID). However, the current evidence around the prevalence and risk factors associated with overweight and obesity in children and adolescents with ID remains unclear. The objective of this article was thus to review the available English- and French-language studies examining the prevalence and risk factors associated with overweight and obesity in youths with ID.

Cortical mechanisms underlying stretch reflex adaptation to intention: a combined EEG-TMS study.

During voluntary motor acts, potential perturbations due to transient external forces are counteracted very quickly by short- and long-latency stretch reflexes (SLSR and LLSR, respectively). The LLSR, presumably linked to a transcortical loop, can be modulated by the subjects' intention. Here, we used combined TMS-EEG to study cortical mechanisms involved in this intention-related modulation both before and during the reaction to a mechanical perturbation.

Honeybees change their height to restore their optic flow.

To further elucidate the mechanisms underlying insects' height and speed control, we trained outdoor honeybees to fly along a high-roofed tunnel, part of which was equipped with a moving floor. Honeybees followed the stationary part of the floor at a given height. On encountering the moving part of the floor, which moved in the same direction as their flight, honeybees descended and flew at a lower height, thus gradually restoring their ventral optic flow (OF) to a similar value to that they had percieved when flying over the stationary part of the floor.

Construct validity of the Social Physique Anxiety Scale in a French adolescent sample.

We conducted a series of studies to investigate the psychometric properties of the Social Physique Anxiety Scale (SPAS; Hart, Leary, & Rejeski, 1989) among a total sample of 1,563 nonclinical French adolescents. The, first study provided support for the item content of the preliminary version of the French SPAS for adolescents. Then, the second study supported the convergent validity of the English and French version of the SPAS.

Construct validity of the Nutrition and Activity Knowledge Scale in a French sample of adolescents with mild to moderate intellectual disability.

The purpose of this study was to test the reliability (i.e. internal consistency and test-retest reliability) and construct validity (i.

Prior intention can locally tune inhibitory processes in the primary motor cortex: direct evidence from combined TMS-EEG.

Human subjects are able to prepare cognitively to resist an involuntary movement evoked by a suprathreshold transcranial magnetic stimulation (TMS) applied over the primary motor cortex (M1) by anticipatory selective modulation of corticospinal excitability. Uncovering how the sensorimotor cortical network is involved in this process could reveal directly how a prior intention can tune the intrinsic dynamics of M1 before any peripheral intervention. Here, we used combined TMS-EEG to study the cortical integrative processes that are engaged both in the preparation to react to TMS (Resist vs.

The body image avoidance questionnaire: assessment of its construct validity in a community sample of French adolescents.

Background: Among the few instruments used to measure the behavioral component of body image disturbances, the Body Image Avoidance Questionnaire (BIAQ) is the most widely used. Despite the wide utilization of this instrument, it is currently unknown whether it is appropriate for male and female adolescents from middle and junior high schools.

Purpose: The main objective of the present series of studies was to test the construct validity of the BIAQ in a community sample of French adolescents.

Assessment of physical self-concept in adolescents with intellectual disability: content and factor validity of the very Short Form of the Physical Self-Inventory.

The purpose of this study was to test the factor validity and reliability of the Very Short Form of the Physical Self-Inventory- (PSI-VSF) within a sample of adolescents with mild to moderate Intellectual Disability (ID). A total of 362 ID adolescents were involved in two studies. In Study 1, the content and format scale response of the PSI-VSF were adapted for adolescents with ID.

Corticospinal control of wrist muscles during expectation of a motor perturbation: a transcranial magnetic stimulation study.

Voluntary movement is often perturbed by the external forces in the environment. Because corticospinal (CS) control of wrist muscles during preparation of voluntary movement has been extensively studied without variation in the external forces, very little is known about the way CS control adapts when subjects expect motor perturbations. Here, we studied the CS control of wrist muscles during expectation of an imposed wrist extension.

Preparing for a motor perturbation: early implication of primary motor and somatosensory cortices.

Although preparation of voluntary movement has been extensively studied, very few human neuroimaging studies have examined preparation of an intentional reaction to a motor perturbation. This latter type of preparation is fundamental for adaptive motor capabilities in everyday life because it allows a desired motor output to be maintained despite changes in external forces. Using fMRI, we studied how the sensorimotor cortical network is implicated in preparing to react to a mechanical motor perturbation.

Entorhinal cortex lesions impair the use of distal but not proximal landmarks during place navigation in the rat.

Rats with entorhinal cortex lesions were trained in two versions of the place navigation task in the Morris water maze. In the distal condition, they had to locate the hidden platform on the basis of remote landmarks, while in the proximal condition, they had to rely only on a configuration of proximal objects, placed directly in the pool. Entorhinal rats were impaired in using distal landmarks but were able to use proximal landmarks to navigate toward the platform.