Effects of hierarchical organization on children's judgments of distance and direction

The impact of the hierarchical organization of a space on judgments of direction and distance was assessed in two studies using two-dimensional models analogous to those used by A. Stevens and P. Coupe (1978, Cognitive Psychology, 10, 422–437). In each study the models contained two stars and were divided into two parts by a curved boundary line. In the Homogeneous condition the stars were located in the same subsection. In the Congruent condition the leftmost star was in the left subsection and the rightmost star was in the right subsection. In the Incongruent condition the rightmost star was in the left subsection and the leftmost star was in the right subsection. In Experiment 1 first graders, third graders, and college students were required to remember the location of the stars. Results indicated that the first and third graders tended to use the relationship between the subsections as a clue to the relationship between the sites within them, thus extending the results of Stevens and Coupe (1978) to children. In Experiment 2 preschoolers, first, and third graders were asked to judge with the materials directly in front of them, which of the two stars was closer to a site located in one of the subsections. Results indicated that the Incongruent condition led to errors among the preschoolers and first graders but not the third graders, thus indicating that these groups tended to judge as closer the site within the same subsection even though it was really farther away. The results of both studies are discussed as indicative of a tendency among young children to impose organization on information encoded in memory and in relation to increases in metric accuracy, decentration, and efficient scanning which enable them to more accurately evaluate when such organization is and is not appropriate. Implications for behavior in large-scale environments are also discussed, with particular reference to the effect of barriers on perceptions of distance and direction.     

Testing measures of the quality of residential care: A pilot study

This paper summarizes the results from a pilot study, designed to test a method of measuring the quality of care provided in two residential units for severely mentally handicapped children. The overall aim has been to devise general measures of the learning conditions (the quality of care) within residential units, which relate to groups of clients, and which are equally applicable at different times of the waking day. Such measures will only constitute a helpful monitoring instrument if they are shown to be reliable; to have, at least, face-validity: to be based upon representative and accurate data; and if they differentiate between settings which, intuitively, appear to differ in the extent to which the clients' appropriate behaviour is prompted and reinforced.     

A tracking procedure for determining the cat's frequency discrimination

A tracking procedure was used to investigate the time required to train cats to discriminate between a frequency-modulated tone and a steady tone. The animal was reinforced with food on a VR schedule only when the steady tone was present and the animal pressed the correct bar (one of two). After reinforcement, the steady tone usually changed to a frequency-modulated signal; by pressing the other bar, the tone could be changed to its steady state and the reinforcement then obtained as before. A major difficulty was the lack of control by the auditory stimulus on the cat's responses. This problem was solved by introducing interpress time outs which forced the animal to hesitate after every press. The use of light cues to signal the time outs and the correct bar to press accelerated the rate at which the training progressed.

With cats, this conditioning procedure apparently requires a much longer training period before the actual threshold determinations than the more commonly used avoidance conditioning procedures. However, when animals are to be tested repeatedly over a period of several months or longer, the procedure may prove the more desirable one because it reduces experimental neurosis.

     

Barking up the wrong tree? Lexical ambiguity resolution in children with language impairments and autistic spectrum disorders

Lexical ambiguity resolution was investigated in 9- to 17-year-olds with language impairment (LI, n=20), autistic spectrum disorder (ASD) plus language impairment (ALI, n=28), ASD and verbal abilities within the normal range (ASO, n=20), and typically developing children (TD, n=28). Experiment 1 investigated knowledge of dominant and subordinate meanings of ambiguous words. The LI and ALI groups knew fewer subordinate meanings than did the ASO and TD groups. Experiment 2 used a modified version of the paradigm to investigate contextual facilitation and suppression of irrelevant meanings. All groups demonstrated contextual facilitation, responding quickly and more accurately to words following a biased context. However, children with ALI and LI did not use context as efficiently as did their peers without language deficit. Furthermore, for the LI and ALI groups, errors in the suppression condition reflected poor contextual processing. These findings challenge the assumptions of weak central coherence theory and demonstrate the need for stringent language controls in the study of autistic cognition.     

The Role Of Attributions and Perceived Control In Recovery From Rape

Abstract

It is fitting that a volume on post-traumatic stress includes chapters on sexual assault given both the prevalence of sexual assault and its effects. Specifically, in terms of prevalence, approximately one woman in five in the United States will be raped in her lifetime (Koss, 1993).¹ In terms of the effects of sexual assault, victims experience heightened fear, anxiety, and depression for several months, and sometimes years, following an assault (see Frazier & Borgida, 1997, and Resick, 1993, for reviews). Sexual victimization affects physical health as well and is a more powerful predictor of physician visits and outpatient medical costs than other factors (e.g., age, smoking, alcohol use) known to be related to health problems (Koss, Koss, & Woodruff, 1991). Finally, sexual assault is one of the traumatic events that is most likely to lead to posttraumatic stress disorder (PTSD) (Breslau, Davis, Andreski, & Peterson, 1991; Norris, 1992; Ullman & Siegel, 1994). In a recent national study of trauma exposure and PTSD by Kessler and his colleagues (Kessler, Sonnega, Bromet, Hughes, & Nelson, 1995), almost half of the women who said that a rape was their worst trauma met lifetime criteria for PTSD. This is in comparison, for example, with a PTSD prevalence rate of 5% for those whose worst event was a natural disaster.