A visual-spatial approach to the study of attention dysfunction was presented. The hypotheses of broadened and narrowed attention were tested by comparing peripheral visual discrimination of acute schizophrenic, chronic schizophrenic, and normal subjects within two regions of the functional visual field. (Editor)

This study was designed to test two sets of hypotheses derived from cognitive-behavioral theories of depression. Discusses the implications of the results for cognitive and behavioral theories of depression. (Editor/RK)

These experiments consider similarities and differences between classifications of pictorial and verbal stimuli in order to investigate whether the kinds of information used differ depending on the stimulus class. Three hypotheses regarding the information used in picture and word classification were evaluated. (Author/RK)

Tests of cognitive and perceptual abilities were given to 140 college students. These subjects then participated on two word-recognition tasks in which their recognition thresholds to both English and artificial words were obtained. (Editor)

Considers the influence of social science on the court process and the interrelationship of education with both. Discusses the distinction between casual and interpretive judgments. (Author/RK)

The intent of this study was to determine whether the Minnesota Percepto-Diagnostic Test (Fuller, 1969; Fuller & Laird, 1963) is more effective than the Bender-Gestalt (Bender, 1937) with respect to identifying achievement-related errors in visual-motor perception. (Author/RK)

Hospitalized brain-damaged patients were Ss in a study designed to evaluate the effectiveness of a treatment technique used with contingent reinforcement to facilitate acquisition and retention of environmentally relevant information. (Editor)

Answers to theoretical questions about the place of input in a formal second language acquisition model are dependent on a distinction between two kinds of learner hypotheses. Type-N hypotheses require "negative evidence" for testing, while Type-P hypotheses are tested on the basis of "positive data" alone. (Author/CB)

Eighty-one university students were given a battery of reaction time tests and a group test of intelligence which yielded timed and untimed scores. Multiple regression analyses indicated that speed of information-processing was an equally good predictor of timed and untimed intelligence test performance. (Author/LMO)

Argues that R. Trapp's reservations regarding the characterization of Jackson's and Jacobs' conversational argument are unfounded. Reports several studies that use procedures similar to those employed by Trapp to confirm Jackson's and Jacobs' theory. Discusses reservations about using subject generated judgments as an unproblematic standard for…

The well-known problem of cumulating error probabilities is reconsidered from a general epistemological perspective, namely, the concepts of severity and of fairness of tests. It is shown that not only Type 1 but also Type 2 errors can cumulate. A new adjustment strategy is proposed and applied. (Author/JAZ)

A project involving third-year college geography students in determining the most accurate method of predicting mean flow velocity in a stream, using three different methods of estimating Manning's roughness coefficient, is described and evaluated. (Author/RM)

Conjunctive item response models are introduced such that: (1) sufficient statistics for latent traits are not necessarily additive in item scores; (2) items are not necessarily locally independent; and (3) existing compensatory (additive) item response models including the binomial, Rasch, logistic, and general locally independent model are…

A recent study (Blair and Higgins, 1980) indicated a power advantage for the Wilcoxon W Test over student's t-test when calculated from a common mixed-normal sample. Results of the present study indicate that the t-test corrected for outliers shows a superior power curve to the Wilcoxon W.

A five by five covariance matrix representing longitudinal measurements at five occasions is used to illustrate that markedly different types of learning curves may generate indistinguishable covariance structures. An excellent fit of a simplex structure can be misleading. Common uses of covariance structure models for growth studies are…