Health and behavior: The coming together of science and practice in psychology and medicine after a century of benign neglect

For thousands of years, physicians had available only a few drugs with which to minister to patients and the practice of psychology was an integral and therapeutically powerful component in the practice of medicine. Thus, good bedside medicine consisting of empathy, compassion, and a nurturant attitude toward the ill individual was a major component of the physician's armamentarium until relatively recently. However, the explosion in scientific knowledge in biology, physiology, chemistry, and microbiology which began a century ago and has continued through the twentieth century helped produce several generations of physician specialists and subspecialists with little knowledge of the powerful role psychological factors play in health and illness. As a result, practitioners of medicine and practitioners of psychology have had little or no contact during most of this century. However, as advances in microbiology, public health, and nutrition have eradicated many of the infectious diseases, infirmities associated with one's lifestyle have replaced the latter as the major causes of death today. One offshoot of this shift is that after a century of benign neglect, physicians and psychologists have rediscovered a common ground in the arena labeled health and behavior. Some factors responsible for these recent developments are highlighted.This article was an invited address delivered to a group of Japanese health psychologists as part of a Health Sciences Seminar in Tokyo on July 24, 1993. Concurrent with its publication here in English, it is being published in the Japanese language in the March 1994 issue of the journal,Japanese Health Psychology.     

The calibration and resolution of confidence in perceptual judgments

Carleton University, Ottawa, Ontariot Canada Confidence rating based calibration and resolution indices were obtained in two experiments requiring perceptual comparisons and in a third with visual gap detection. Four important results were obtained. First, as in the general knowledge domain, subjects were underconfident when judgments were easy and overconfident when they were difficult. Second, paralleling the clear dependence of calibration on decisional difficulty, resolution decreased with increases in decision difficulty arising either from decreases in discriminability or from increasing demands for speed at the expense of accuracy. Third, providing trial-by-trial response feedback on difficult tasks improved resolution but had no effect on calibration. Fourth, subjects can accurately reportsubjective errors (i.e., trials in which they have indicated that they made an error) with their confidence ratings. It is also shown that the properties of decision time, conditionalized on confidence category, impose a rigorous set of constraints on theories of confidence calibration.     

On the scaling of visual space from motion—in response to Pizlo and Salacfa-Golyska

Pizlo and Salack-Golyska (1994) have raised an important question about the validity of the interpretation of experiments reported by Lappin and Love (1992)—based on the fact that alternative cues in the image plane might have supported the shape discriminations in those experiments. The meaning of the hypothesis that visual space may be scaled by congruence under motion is clarified, pertinent evidence is reviewed, and new experimental evidence is reported We conclude that visual space can be metrically scaled by congruence of moving shapes.     

Visual slow brain potentials in children with attention deficit disorder

Using a two-stimulus reaction time paradigm, with two separate reward conditions (contingent and noncontingent), we compared slow wave brain potentials (ERPs) in 144 children with attention deficit disorder (ADD) and 30 normal control children. This article reviews the findings during the 900 msec visual warning stimulus. As we had expected, based on ERP work of Forth and Hare (1989) and Raine, Venables and Williams (1990), and on previous work from our own laboratory, the group differences were found in the negative slow wave portions of the ERP complex during the contingent reward condition but not during the noncontingent condition. Aggressive hyperactive subjects with attention deficit disorder (ADDHA) were discriminated from nonaggressive subjects (including control subjects) during the contingent reward condition in the following ways: (1) greater fronto-central negativity (640–900 msec slow wave) and (2) greater right parietal than left parietal negativity (430–750 msec slow wave). All ADD subgroups, when compared to control (CONTR) subjects, showed greater slow wave negativity (700–900 msec) at the midline occipital electrode site during the contingent reward condition. This could be explained in part as an IQ effect on ERPs reflecting the IQ difference between the ADD subgroups and the controls. These slow wave findings seem to relate to attentional problems of these children. They are discussed in terms of a psychobiological model of inhibition/disinhibition and appetitive activation.