Visual angle as a determinant of perceived interobject distance

Two new experiments and a reanalysis of Toye’s (1986)data are used to examine the relationship between true distance and perceived distance in natural scenes. In the first experiment, 8 subjects estimated 78 interobject distances, formed by all pairs of 13 objects, while viewing the objects from a fixed position. The results showed that estimated distance is a linear function of the visual angle between objects as well as of the true distance. This relationship results in distances perpendicular to the line of sight being overestimated in relation to true distances and to distances parallel to the line of sight. These findings were confirmed by reanalysis of a comparable data set from Toye. Since changes in the visual angle can come about through changes in alignment with the line of sight, viewing distance, or interobject distance, Experiment 2 was designed to determine whether the visual angle effect was due to one of these, or whether it was an independent effect. In Experiment 2, 8 subjects estimated six interobject distances from 12 viewing positions. The results showed that visual angle predicted estimated distance independently of how the change in visual angle came about, suggesting that the greater the visual angle between objects, the more their separation is overestimated.     

Wiping the slate clean: a lexical semantic exploration.

This paper presents a case study in lexical semantic analysis aimed at uncovering syntactically relevant components of verb meaning. Our strategy is to investigate the nature of the lexical knowledge that a speaker of English possesses with respect to certain apparently semantically related verbs: a set of verbs that might as a first approximation be classed as verbs of removal. However, a closer examination of these apparently semantically related verbs reveals that their syntactic properties diverge. An exploration of the patterns of behavior of the verbs suggests that the initial class includes three linguistically significant subclasses. The components of meaning that are relevant to characterizing each subclass are identified by isolating those components of meaning that the members of each subclass share. The conclusion considers the implications of the meaning components identified in this study for a lexical semantic representation.     

The role of strategy utility knowledge in children's strategy decision making

Ten- to thirteen-year-olds selected between two methods for learning vocabulary meanings, the objectively more effective keyword method and a naturalistic context method. The main hypothesis of the study was that children produce relative strategy efficacy knowledge during practive with strategies but that children may fail to use this knowledge to direct maintenance of the more effective strategy. To evaluate this position, control subjects selected between the keyword and context strategies without the benefit of practice. In three other conditions subjects practiced the techniques before making strategy choices. Simple practice did not increase keyword-method selection. Practice combined with a prompt to think back to performance with the two strategies during practice increased keyword selection to a high level, comparable to keyword selection when subjects were given explicit feedback about keyword superiority immediately before strategy selections were made. Supplementary analyses supported the conclusion that even in the absence of explicit performance feedback, children can be induced to reflect on their use of strategies and the outcome of those strategic actions in a fashion as to affect their subsequent cognitive actions, in this case, strategy choices. The data are discussed with reference to other work on monitoring and metamemorial effects on cognition.     

Varieties of frequency interference in children's recognition of sentence information

The memory of fourth-grade children (9 years, 10 months of age) for information contained in target sentences presented 24 hours earlier was tested by multiple-choice recognition items each consisting of a question about a target sentence followed by three response options. The options consisted of the correct word from the sentence, a new word, and an old, incorrect word that was contained in another sentence on the study trial. The results indicated that the amount of interference produced by old information depended upon the relationship between the sentence in which the old information occurred and the target sentence—being the least when the two were unrelated; the most when the two shared the same subject noun (which also occurred in the stem of the test item for the target sentence); and intermediate when the subjects of the two sentences were synonyms. The interference produced by these manipulations was moderated by instructional strategies and the distance between the target sentence and its variation. The experiment establishes the validity of contextual frequency accrual, a construct logically necessary in extending frequency theory to recognition of information contained in sentences.     

Scaling a conditional proximity matrix to symmetry

Two least squares procedures for symmetrization of a conditional proximity matrix are derived. The solutions provide multiplicative constants for scaling the rows or columns of the matrix to maximize symmetry. It is suggested that the symmetrization is applicable for the elimination of bias effects like response bias, or constraints on the marginal frequencies imposed by the experimental design, as in confusion matrices.The application of the scaling procedure to a matrix of conditional probabilities was suggested by one of the referees, whose helpful comments are gratefully acknowledged.     

The McMaster family therapy outcome study: an overview of methods and results

A multifaceted outcome design was used to investigate the results of brief, system-oriented family therapy. The present report describes the methods used and provides an, overview of clients' status on a variety of outcome measures. Treatment was brief and involved the entire family in most cases. Therapists varied in discipline (psychiatry, social work, psychology or nursing) and experience (students to very senior status). A variety of measures were obtained at the beginning of treatment, at treatment closure, or after a six month follow-up. Independent interviewers conducted the six month follow-up. Measures were obtained regarding the parents' and children's level of intellectual functioning, children's academic achievement, and disruptive school behaviour. Therapists' ratings of the families' change in treatment and prognosis were also obtained at treatment closure. At follow-up, measures of the children's academic achievement and disruptive school behavior were repreated and the interviewers determined the family's satisfaction with the services they received. The results indicate that the majority of families did well on most of the measures considered. No significant change was found in terms of the children's academic performance, but there was a significant decline in their disruptive school behaviour.This project was funded by grants from the Medical Research Council of Canada, and Health and Welfare Ministry, Canada.     

The Dance of Attention: Toward an Aesthetic Dimension of Attention-Deficit

What role does the aesthetics of bodily movement play in the understanding of attention among children diagnosed with attention-deficit/hyperactivity disorder (ADHD)? This article animates a phenomenological approach to attention and embodiment with a special focus on the relation between aesthetic or expressive bodily movement and behavioral awareness in children diagnosed with ADHD. However, beyond this it is argued that the aesthetic aspect of movement calls for an expansion of the phenomenological perspective. In this context Gilles Deleuze’s notion of aesthetics as a “science of the sensible” is activated and discussed in relation to the phenomenological concept of perception. Empirically the article takes point of departure in a qualitative study conducted with a group of children with attention-deficit practicing the Afro-Brazilian marital art, capoeira. Combining ethnographic and phenomenological methods, it is demonstrated that capoeira can be considered a form of aesthetic movement that offers a transition of attention-deficit into a productive force of expression that changes the notions of sensation and movement in ADHD.