Thesis (Ph. D.)--University of Wisconsin--Madison, 1984. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 161-167).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 119-124).

No description available.

The present study was a systematic investigation of hierarchical skill sequences in the design copying domain. The factors associated with possible variations in task difficulty were delineated. Five hierarchies were developed to reflect variations in rule usage, the structuring of responses, presence of angles, spatial orientations, and stimulus complexity. Three-hundred thirty four subjects aged five through ten years were administered a 25 item design copying test. The data were analyzed using probabilistic models. Latent trait models were developed to test the hypothesized skill sequences. Each latent trait model was statistically compared to alternate models to arrive at a preferred model that would adequately represent the data. Results suggested that items with predictable difficulty levels can be developed in this domain based on an analysis of stimulus dimensions and the use of rules for task completion. The inclusion of visual cues to guide design copying assists accurate task completion. Implications of the current findings for facilitating the construction of tests which accurately provide information about children's skill levels were discussed. The presence of hierarchical skill sequences in a variety of ability domains was supported.

This research investigated the precision with which spatial information can be maintained in memory and reproduced as well as factors which may effect these emerging abilities. To study this, ten males and ten females in each of first, third, fifth, and seventh grades participated in three drawing tasks under two conditions (match and recall). The tasks involved the presentation of a 4" straight line or a 2" x 2" right angle drawn on an 8" white disc. Subjects were asked to draw a line exactly the same size and in the same place (static), after an imagined rotation, or after an imagined bending or unbending of the line (transformation) on an 1" white disc. Several mixed design analyses of variance with repeated measures on the task variables were run. First graders made significantly more errors than all other subjects. Third and fifth graders differed little and both performed significantly less accurately than seventh graders. Performance on the rotation task and the transformation task did not differ significantly with performance on both yielding more error than performance on the static task. The match condition generally proved easier than the recall condition, straight lines led to less error than bent lines, and orientation information was more accurately preserved than metric information. The requirements of the task, i.e., no change, change in position, or a change in form, interacted with both the stimulus type and the type of information preserved. Grade level also interacted significantly with task and stimulus type. When determining how spatial abilities emerge and the accuracy with which spatial information can be dealt, task demands, stimulus characteristics, and type of information being measured must be considered along with the developmental changes.

The search for evidence of cognitive abilities in young children that have been previously detected only in the performance of older children and adults has been a target of study by many cognitive developmental psychologists. Early competency views suggest that aspects of cognitive fundamentals are present very early in life and are in some aspects developmentally invariant. Often, the focus of research is on the delineation of the constraints which direct and restrict deployment of early intellectual abilities to illuminate the regularities and patterns in observed developmental change. The purpose of this research was to examine children's proficiency with mental rotation tasks that involved the reorientation of complex multi-component stimuli. Specifically, the existence of stimulus effect and determination of which stimulus components prove problematic under taxing performance conditions was investigated. Sixteen students, eight first graders and eight third graders, participated in a two-choice discrimination task. Each student was assessed individually on 360 test trials in eight 20-minute sessions. Three test conditions included (1) perception, (2) memory, and (3) rotation. Two multi-component stimuli were used in which the experimenter-defined components included (A) an external protrusion on the edge of a circle, and (B) an internal axis system within the interior of the circle. The two stimuli varied in the placement of the internal axes which was either orthogonally or obliquely orientated. Test items in the memory and the rotation conditions included stimuli orthogonally oriented (90°, 180°, 270°) obliquely oriented (45°, 135°, 225°, 315°). Error scores were analyzed in a four-way analysis of variance. A main effect for foil type was found significant with axis foils being more difficult than protrusion foils. Furthermore, a significant four-way interaction effect was detected indicating that as stimulus characteristics and task demands increased in difficulty, performance declined particularly for the younger age group.

Childrens' spatial ability has been studied from developmental and differential psychology orientations and by information-processing theorists. No unified means of examining spatial ability has been attempted by investigators. The focus of this research is thus based on the integration of developmental predictions with a processing model created to generate and test hypotheses regarding certain spatial competencies of young children. Of primary interest was how young children perform depending on the dimensionality of the spatial materials utilized in the experimental task. One hundred and sixty 4 and 6 year old children were randomly selected for one of four treatment conditions with age and sex distributed equally in each condition. Spatial materials were presented in either two or three dimensions and subjects were required to judge whether a response item also presented in two or three dimensions matched the stimulus display. Across-versus within-dimensional performance was therefore compared in a single study. Five displays were presented ranging in difficulty from simple to complex. Response materials consisted of a correct match on the stimulus item and four error types. Types of errors included a geometric violation (in which the objects in the display were unconnected at one point), a depth violation (lack of the depth dimension), a 90° or 270° rotation violation and a 180° violation. These last two violations were considered orientation errors similar to those children exhibit on perspective-taking tasks. Three separate analyses of variance were performed on the data. Results from each of these analyses indicated that six year old children significantly outperformed four year olds in all conditions. However, of importance to developmental psychology was the finding that all subjects performed as well as they did on a task thought to be quite difficult. Also reiterated in these analyses was the result that within-dimensional performance was significantly better than across-dimensional ability for all subjects. Analysis of display complexity revealed that there was differential success for the subjects based on the complexity of the display. Errors analysis indicated that the rotation and reflection foils created the most difficulty for subjects. This finding was reiterated in the Age X Foil Type interaction and Sex X Stimulus Dimension X Response Dimension X Foil Type interaction, in which four year olds' relative inability to perform on these errors as compared to six year olds was shown. This suggests that the ability to correctly discriminate orientation occurs late in the developmental sequence. While no main effect for sex was indicated by any of the analyses, there was an interesting finding as a result of the Sex X Stimulus Dimension X Response Dimension X Foil Type interaction. When across-dimension performance was examined, it was found that males made relatively more errors of an orientation type than females, exhibiting a possible lack of attention to the provided facilitative reference frame. Results were further discussed in terms of predictions from the hypothetical model and in regard to developmental issues. Limitations of the work were also discussed.

Thesis (MPsych(Clin))--University of South Australia, 1995

Thesis (Ph. D.)--University of Chicago, Dept. of Psychology, March 2000. / Includes bibliographical references. Also available on the Internet.

No description available.