Instructions to authors

Instructions for Authors

Instructions to authors     

Pappus in optical space

Optical space differs from physical space. The structure of optical space has generally been assumed to be metrical. In contradistinction, we do not assume any metric, but only incidence relations (i.e., we assume that optical points and lines exist and that two points define a unique line, and two lines a unique point). (The incidence relations have generally been assumed implicitly by earlier authors.) The condition that makes such an incidence structure into a projective space is the Pappus condition. The Pappus condition describes a projective relation between three collinear triples of points, whose validity can--in principle--be verified empirically. The Pappus condition is a necessary condition for optical space to be a homogeneous space (Lobatchevski hyperbolic or Riemann elliptic space) as assumed by, for example, the well-known Luneburg theory. We test the Pappus condition in a full-cue situation (open field, broad daylight, distances of up to 20 m, visual fields of up to 160 degrees diameter). We found that although optical space is definitely not veridical, even under full-cue conditions, violations of the Pappus condition are the exception. Apparently optical space is not totally different from a homogeneous space, although it is in no way close to Euclidean.     

Psychiatric Hospitalization and School and Community Adjustment of Children and Adolescents with Acquired Brain Injury

There is a high prevalence of psychiatric disorders in children and adolescents who have acquired brain injury (ABI). We examined the records of 82 students with ABI who were admitted to a community-based school for education and neurorehabilitation over a three-year period to determine how many experienced one or more psychiatric hospitalizations before admission, and whether hospitalization status was related to positive school and community adjustment. Results were that 30.4% of the students had a documented history of one or more psychiatric hospitalizations. Of this group, 60.0% were able to be maintained in the community-based school program and 40.0% were discharged to other settings. When discharged, 70.0% of students entered more restrictive treatment programs (e.g., psychiatric hospital, secure residential facility, residential school). The number of psychiatric hospitalizations did not predict discharge from the community-based school and was unrelated to the type of discharge setting. Clinical and research issues concerning psychiatric disorders in children and adolescents with ABI in relation to post-acute adjustment are discussed.     

Hot dogs and zavy cats: preschoolers' and adults' expectations about familiar and novel adjectives

In recent years, a growing body of research has begun to examine the processes that underlie young children's acquisition of adjectival meanings. In the present studies, we examined whether preschoolers' willingness to extend adjectives was influenced by the type of property labeled by familiar adjectives (Experiment 1) and by semantic information conveyed in the sentence used to introduce novel adjectives (Experiment 2). In Experiment 1, we examined preschoolers' and adults' expectations about the generalizability of familiar adjectives of three different types: emotional state terms, physiological state terms, and stable trait terms. On each trial, we labeled a target animal with one of the three different types of adjectives and asked whether these terms could apply to a subordinate-level match, a basic-level match, a superordinate-level match, or an inanimate object. Results indicated that 4-year-olds and adults extended the trait terms, but not the emotional or physiological terms, to members of the same basic-level category. In Experiment 2, we presented 4-year-olds and adults with novel adjectives in one of two verb frames: stable ("This X is very daxy") or transient ("This X feels very daxy"). Participants were more likely to extend the novel adjective to subordinate matches if they were in the Stable frame group than if they were in the Transient frame group. These findings are discussed in terms of implications for young children's expectations about familiar and novel adjectives.     

National personality characteristics: II. Adaption-innovation in Canadian,American, and British samples

On the Kirton Adaption-Innovation Inventory 1,106 Canadians scored as more adaptive than American and British standardization samples. Means for Canadian females and males were congruent with those in national samples from six other countries.     

Exocentric pointing to opposite targets

We use an exocentric pointing task to study exocentric visual directions to targets that are opposite to a pointer relative to the observer. (The apparent distance between the target and the pointer always exceeded 90 degrees of visual angle.) All pointing takes place in the horizontal plane at eye height. Observers could not see both target and pointer at a single glance. They had to look back and forth between them, using combinations of eye movements, head turns, twists at the waist and turning on the feet. In the limit of diametrically opposite targets we find that the observers pick either one of two distinct orientations of the pointer as equally "visually correct". Which one results depends on the stance assumed by the observer. The difference between the two equally acceptable pointings is between 5 degrees and 10 degrees. Such a result is predicted from earlier measurements in the context of a model that describes the geometry of the horizon as a Riemannian space with varying intrinsic curvature. The present results thus fit--perhaps surprisingly--very well in such a picture.     

Preliminary examination of the relationship between anxiety disorders in adults and self-reported history of teasing or bullying experiences

This preliminary study examined the relationship between anxiety disorders and self-reported history of teasing or bullying experiences, comparing individuals with social phobia, obsessive compulsive disorder, and panic disorder with or without agoraphobia. Given that aversive conditioning experiences, such as severe teasing, have been proposed to play a role in the development of social phobia and that the core feature of social phobia is a fear of social situations in which a person may be embarrassed or humiliated, we hypothesized that the social phobia group would have a higher rate of self-reported teasing history than would the obsessive compulsive disorder or panic disorder groups. Consistent with this hypothesis, a relationship between reported history of teasing and diagnosis was found. A significantly greater percentage of participants in the social phobia group (92%) reported a history of severe teasing experiences compared with the obsessive compulsive disorder (50%) and panic disorder (35%) groups. History of teasing experiences was also significantly related to an earlier age of onset for all 3 anxiety disorders, and to a greater number of self-reported additional problems in childhood. These findings suggest further directions for research in this area and highlight the significant link between perceptions of teasing in childhood and social phobia.     

Mirror-reflecting a picture of an object: what happens to the shape percept?

Although a two-dimensional picture never fully specifies the actual layout of the depicted three-dimensional scene, one is still able to make a three-dimensional interpretation. When a picture is mirror-reflected, the range of plausible scenes possibly corresponding with the depicted scene has not changed with respect to the original depiction. We were curious to find out whether the inherent picture ambiguities would be solved the same way or differently. Participants performed local attitude settings on three sets of pictures: (1) original pictures, (2) left-right mirrored pictures, and (3) up-down mirrored pictures. Pairwise comparison of the pictorial reliefs of the depicted object, reconstructed from the raw settings, revealed dissimilarities. The differences, however, could be drastically diminished by conducting an affine transformation correction taking into account not only the depths, but also the picture plane coordinates. The inherent ambiguities seemed thus to be solved differently between conditions. By factoring out different solutions to the ambiguities, the pictorial reliefs were found to be equivalent.     

Long-term semantic transfer: An overlapping-operations account

Semantic priming is usually a short-lived effect. However, it is also usually investigated using undemanding tasks, such as naming or lexical decision. We instead required subjects to perform category verification. We observed semantically mediated transfer occurring at an average lag of 90 intervening trials. We also observed that this priming was specific to the stimulus properties made salient in prime and probe displays and the particular task demanded in those displays. We interpret the results within an overlapping-operations framework, based on the work of Kolers (e.g., 1976).     

Development of visuospatial short-term memory in the second half of the 1st year

Eighty 5.5- to 12.5-month-old infants participated in 4 delayed-response procedures challenging shortterm visuospatial memory (STVM), 2 that varied the time between presentation and search and 2 that varied the number of locations. Within each type of challenge, 1 task required a gaze response and 1 required a reach response. There was little improvement in STVM performance from 5.5 to 8 months and linear improvement in the percentage correct from 8 to 12 months, with overall STVM performance accounting for 66% of the variance in age. Improvement in searching multiple locations lagged behind improvement in spanning longer delays. Memory scores did not vary for the visual and manual tasks. Perseveration was greatest for reach responses, increased with challenge, and decreased with age. ((c) 2004 APA, all rights reserved)