More than just perception–action recalibration: Walking through a virtual environment causes rescaling of perceived space

Egocentric distances in virtual environments are commonly underperceived by up to 50 % of the intended distance. However, a brief period of interaction in which participants walk through the virtual environment while receiving visual feedback can dramatically improve distance judgments. Two experiments were designed to explore whether the increase in postinteraction distance judgments is due to perception–action recalibration or the rescaling of perceived space. Perception–action recalibration as a result of walking interaction should only affect action-specific distance judgments, whereas rescaling of perceived space should affect all distance judgments based on the rescaled percept. Participants made blind-walking distance judgments and verbal size judgments in response to objects in a virtual environment before and after interacting with the environment through either walking (Experiment 1) or reaching (Experiment 2). Size judgments were used to infer perceived distance under the assumption of size–distance invariance, and these served as an implicit measure of perceived distance. Preinteraction walking and size-based distance judgments indicated an underperception of egocentric distance, whereas postinteraction walking and size-based distance judgments both increased as a result of the walking interaction, indicating that walking through the virtual environment with continuous visual feedback caused rescaling of the perceived space. However, interaction with the virtual environment through reaching had no effect on either type of distance judgment, indicating that physical translation through the virtual environment may be necessary for a rescaling of perceived space. Furthermore, the size-based distance and walking distance judgments were highly correlated, even across changes in perceived distance, providing support for the size–distance invariance hypothesis.     

Dr John Hunter Padel 1913–1999

SUMMARY

With the help of clinical material from two female patients with whom acting out was a major feature of their treatment I have examined the connection between acting out behaviour and separation anxiety.

To begin with, I have drawn on Freud's conception of acting out and have shown that this kind of behaviour can be closely associated with transference in that both can act as a resistance as well as an aid to the psychoanalytic process.

The link between acting out and preverbal experience is commented on and attention is given to the defensive splitting of the primary object during early development.

It is then suggested that one of the essential roots associated with acting out behaviour is that of object loss and separation.

The clinical examples show that if the child separates in a strongly hostile manner from the mother then acting out associated with separations during analysis is going to be greater.

In view of the deficits in the early mother child relationships of the two patients described I adopted a therapeutic strategy based less on confrontation and limit setting and more on a consistent attempt to understand what was being communicated in the acting out behaviour.     

When disgust leads to dysphoria: A three-wave longitudinal study assessing the temporal relationship between self-disgust and depressive symptoms

Research has shown that feelings of self-disgust may have a functional role in the genesis of depression by partially mediating the cross-sectional relationship between dysfunctional thoughts and depressive symptoms. However, there are many outstanding issues regarding these hypothesised associations. First, it is not yet clear whether self-disgust is a temporal antecedent, concomitant, or consequence of depressive experience. Second, it is not known whether the hypothesised mediation sequence is valid over time. Third, the relative contribution of disgust towards different aspects of the self has not yet been examined. In the present longitudinal study, participants completed measures of dysfunctional cognitions, self-disgust and depressive symptoms at baseline, and at six and 12-month follow-ups. Analysis showed that self-disgust is best considered as antecedent to depressive symptoms; the hypothesised mediation model was partially supported, but is too simplistic; and disgust towards physical aspects of the self, rather than behaviour, was more important as a temporal predictor of depressive symptoms. The current results help elucidate the role of self-disgust as an antecedent of depressive experience.     

The Development of Narrative Comprehension and Its Relation to Other Early Reading Skills

The first goal of this study was to examine young children's developing narrative comprehension abilities using theory-based, authentic measures of comprehension processes. The second goal was to examine the relations among young children's comprehension abilities and other early reading skills. Children ages 4 and 6 listened to or watched two authentic narratives. We measured their comprehension of these narratives as well as vocabulary and skills associated with word decoding. The results revealed that even the younger children were sensitive to the underlying structure of the narratives and that this sensitivity increased with age. Measures of narrative comprehension were not consistently correlated with skills associated with word decoding, such as phonological awareness. The results are discussed in terms of theoretical models of comprehension and of reading development. Practical implications of the findings are also explored.     

Additive,Multi-Component Treatment of Emerging Refusal Topographies in a Pediatric Feeding Disorder

This case study describes inter-disciplinary treatment of chronic food refusal and tube dependency in a 2-year-old female with a pediatric feeding disorder. Evidence-based behavioral components—including escape extinction (EE), differential reinforcement of alterative mealtime behavior (DRA), and stimulus fading—were introduced sequentially as the focus of treatment shifted to address refusal topographies along the chain of behaviors associated with consumption. The assessment process, treatment planning and sequencing, and generalization of treatment gains to caregivers are presented in detail. In doing so, the study illustrates the core features involved in applying a flexible, evidenced-based approach to treat severe feeding difficulties.     

Parent-Child Interaction Therapy for Toddlers: A Pilot Study

Parent-Child Interaction Therapy (PCIT) is an evidence-based program used to treat behavioral disorders in early childhood (2–7 years; Eyberg, 1988 Eyberg , S. ( 1988 ). Parent-Child Interaction Therapy: Integration of traditional and behavioral concerns . Child Family Behavior Therapy , 10 ( 1 ), 33 – 46 .[Taylor & Francis Online] , [Google Scholar]). This article describes a modified version of PCIT for young toddlers (PCIT-T) adapted to meet the developmental needs of children aged 12–24 months. A pilot study was conducted to evaluate the effectiveness of PCIT-T with 29 parent-toddler dyads (children aged <2 years) presenting with significant behavior problems, assessed pretreatment and posttreatment. Outcomes for two groups of older children who participated in PCIT (Group 1: 2–3 years, n = 29; Group 2: 3–4 years, n = 29) were also assessed. Results showed PCIT-T to be associated with a range of positive child and parental outcomes including decreased intensity of disruptive child behaviors, increased parental utilization of PCIT parenting skills, decreased parental depressive symptoms, and high levels of consumer satisfaction with the program. This study provides early evidence that a modified version of PCIT can be successfully used to treat behavior disorders in children aged less than 2 years.     

Imaginary Worlds in Middle Childhood: A Qualitative Study of Two Pairs of Coordinated Paracosms

Imagining alternatives to actual experiences is an important part of everyday life that can take many forms. One manifestation in middle childhood is the creation of elaborate imaginary worlds, called paracosms. Retrospective reports of adults indicate that having a childhood paracosm is more commonly reported in individuals acknowledged for being highly creative. In this study, we interviewed four children aged 10 to 12 years with interconnected paracosms about the details of their imagined worlds. Our findings indicated that paracosms served as a platform for social activity with friends, a way to explore real world interests (e.g., geography, language), and a vehicle for engaging in creative pursuits (e.g., drawing, storytelling).     

The power of the past: Nostalgia as a meaning-making resource

In three experiments we tested whether nostalgia bolsters meaning in life relative to two other modes of autobiographical thought: imagining a desired future experience and recalling a positive past experience. In Experiment 1 participants thought about a nostalgic or desired future experience and then completed a presence of meaning scale. Thinking about a nostalgic (compared to desired future) experience increased perceived presence of meaning. In Experiment 2 we examined whether nostalgia can additionally reduce the search for meaning. Participants thought about a nostalgic, desired future or recent positive experience, and then completed a search for meaning scale. Nostalgia, relative to both comparison conditions, decreased the search for meaning. Finally we tested whether, by virtue of its capacity to increase meaning, nostalgia can mitigate threats to meaning. In Experiment 3 participants were exposed to either absurd or representational art, under the guise that they would later have to interpret its meaning, and then thought about either a nostalgic or a recent positive experience. Meaning was subsequently measured. The absurd art interpretation condition decreased the perceived presence of meaning but nostalgic reflection attenuated this effect.     

Memory for pitch in congenital amusia: Beyond a fine-grained pitch discrimination problem

Congenital amusia is a disorder that affects the perception and production of music. While amusia has been associated with deficits in pitch discrimination, several reports suggest that memory deficits also play a role. The present study investigated short-term memory span for pitch-based and verbal information in 14 individuals with amusia and matched controls. Analogous adaptive-tracking procedures were used to generate tone and digit spans using stimuli that exceeded psychophysically measured pitch perception thresholds. Individuals with amusia had significantly smaller tone spans, whereas their digits spans were a similar size to those of controls. An automated operation span task was used to determine working memory capacity. Working memory deficits were seen in only a small subgroup of individuals with amusia. These findings support the existence of a pitch-specific component within short-term memory and suggest that congenital amusia is more than a disorder of fine-grained pitch discrimination.     

The Effect of Knee Joint Angle on Torque Control

The purpose of the author's investigation was to examine the effect of knee joint angle on torque control of the quadriceps muscle group. In all, 12 healthy adults produced maximal voluntary contractions and submaximal torque (15, 30, and 45% MVC [maximal voluntary contraction]) at leg flexion angles of 15°, 30°, 60°, and 90° below the horizontal plane. As expected, MVC values changed with respect to joint angle with maximum torque output being greatest at 60° and least at 15°. During the submaximal tasks, participants appropriately scaled their torque output to the required targets. Absolute variability (i.e., standard deviation) of torque output was greatest at 60° and 90° knee flexion. However, relative variability as indexed by coefficient of variation (CV) decreased as joint angle increased, with the greatest CV occurring at 15°. These results are congruent with the hypothesis that joint angle influences the control of torque.