Main and interaction effects of metallic toxins on classroom behavior

This study investigated the relationships of metal levels and metal combinations to children's classroom behavior. Hair-metal concentrations of lead, arsenic, mercury, cadmium, and aluminum were determined in 80 randomly selected elementary-age children, who were also rated by their classroom teacher on the Walker Problem Behavior Identification Checklist (WPBIC). Parents were interviewed to control for confounding variables that may have affected behavioral development. Regression analysis indicated that the set of metals was significantly related to increased scores on four of the five WPBIC subscales and on the total scale, with lead being a major contributor to four of the six dependent measures. Metal combinations were significantly related to increased scores on the WPBIC subscales measuring acting-out, disturbed peer relations, and immaturity, and on the total scale. A continuing reexamination of metal poisoning concentrations is needed because metal levels and metal combinations previously thought harmless may be associated with nonadaptive classroom behavior.     

Effects of antipsychotic medication on discrimination learning for institutionalized adults who have mental retardation

Reduction in medication levels of drugs used to suppress inappropriate behavior (chlorpromazine, thioridazine and haloperidol) resulted in increases in performance on a discrimination learning task for seven residents of a state institution who are mentally retarded. After training to criterion on a matching-to-sample task, these participants experienced reductions in medication in an N of 1 AB replication paradigm. Two controls were medication free, and one remained on a stable dosage throughout. Improvement of performance on the first dependent variable (number of trials needed to meet criterion) ranged from 13.8% to 53.3% for the seven participants, while the three controls improved less than 1%. Improvement of performance on the second dependent variable (percentage of correct responses) ranged from 2.7% to 19.7% for experimental subjects; five of the seven subjects exhibited a minimum improvement of 8%. The change in percentage of correct responses for the three controls ranged from ?4.9 to 1.3. Treatment implications are discussed.     

Why does self-reference promote incidental encoding?

Answering a question regarding a stimulus word can cause incidental encoding of the word itself. The thoroughness of the encoding depends in part upon what question is answered. For example, saying whether a word describes oneself causes a particularly high degree of incidental encoding. The study reported here investigated several variables that have been proposed as mediators of that effect. As in previous research, subjects completed an incidental-encoding and recall procedure. They then rated (a) the quality and degree of affect that they would experience if each stimulus word were to be applied to them, (b) the importance to them of the behavioral/psychological dimension implied by the stimulus word, and (c) the degree to which they saw themselves as distinctive on that dimension. As in previous studies, deciding whether a word described the self increased the likelihood of subsequent recall. There also was a highly significant interaction such that words judged to be applicable to self were recalled better than those judged not to be applicable. There was no evidence, however, of a mediational role for any other variable studied. Discussion centers on theoretical implications of the data.     

The Self-Consciousness Scale: A Revised Version for Use with General Populations1

Recent research suggests that some of the wording of the original Self-Consciousness Scale is too abstract for easy understanding by research participants who are not college students. This article presents a revised version of that scale, along with information regarding its psychometric properties. In general, the psychometric properties of the revised scale compare quite favorably to those of the original scale. It is suggested that the revised Self-Consciousness Scale be used whenever data are collected from populations other than college students.     

STAR: A unique embedded performance assessment technique

STAR (The Strategic and Tactical Assessment Record) is a versatile research tool designed to evaluate the effects of sustained performance and other stressors on integrated, complex cognitive functioning. This completely automated task is presented in the form of a highly motivating computer game. However, unlike typical computer games, successful performance of STAR depends on an individual’s ability to rapidly and accurately assess risk/benefit ratios in a variety of situations, and on the skilled use of an array of multipurpose control systems. STAR is unique in that approximately 80 performance measures are unobtrusively embedded in the operations required to “play the game”; no obvious performance assessment interferes with task presentation. STAR provides multiple measures of psychomotor function, attention, memory, information processing, decision making, risk-taking behavior, subjective state, errors, and error paths. In this report, we describe STAR, and summarize two preliminary experiments designed to separately evaluate the effects of task difficulty and task stress level on complex performance.