Equivalence of body image disturbances in anorexia and bulimia nervosa.

A silhouette method, the Body Image Assessment, was used to measure self-evaluation of current and ideal body size in three groups: Ss with with anorexia nervosa (n = 37), Ss with bulimia nervosa (n = 59), and normal control Ss (n = 95). Current and ideal body size measures were contrasted across the three groups using body mass index as a covariate to control for the Ss actual body size. Both eating disorder groups judged current body size to be larger and ideal body size to be thinner relative to control Ss. When actual body size was not statistically controlled, Ss with anorexia nervosa judged current body size to be thinner than did control Ss and Ss with bulimia nervosa. These data illustrate the importance of controlling for actual body size when investigating the self-evaluation of body size.

Microinjection of opioid antagonists into the substantia nigra reduces stress-induced eating in rats.

Stress produced by pinching the tail has been shown to cause satiated animals to eat and to display oral stereotypies. Endogenous opioids and central dopamine systems have been implicated in the mediation of these effects. In order to test the possibility that the substantia nigra (SN) might be involved, the amount of food intake and gnawing produced by mild tail pinch were assessed following bilateral microinjections of opioid antagonists into the SN. Evaluations of nociceptive thresholds were also conducted using tail flick and hot plate tests. Eating induced by tail pinch was reduced by microinjections of the non-selective opioid antagonist naloxone (3, 10, 20 and 30 nmol) and by the mu-selective antagonist Cys2, Tyr3, Orn5, Pen7 Amide (CTOP) (1, 3 and 10 nmol). These effects on eating occurred in the absence of effects on gnawing. kappa- and delta-antagonists (10 nmol) had no effect on eating or gnawing. Naloxone did not alter either tail flick or hot-plate response latencies. The highest dose of CTOP increased response latency on the hot-plate test only. The results are interpreted as suggesting that the SN may be an important central site of action for opioid antagonists in reducing stress-induced eating. The possibility that the SN may be a central site mediating the effects of dopamine on this phenomenon is also discussed.

Postconcussion symptoms and daily stress in normal and head-injured college populations.

The postconcussion syndrome is a term invoked to describe a constellation of cognitive (decreased memory and concentration), emotional (increased irritability and nervousness or anxiety), and physical (increased headaches and dizziness) changes that are commonly reported following minor or severe head injuries. The first section presents the development and validation of the Postconcussion Syndrome Checklist. The second section describes the daily changes in symptom reports as a function of daily stress levels. A population of head-injured subjects and controls monitored postconcussion symptoms and stress across a 6-week period. The frequency, intensity, and duration of symptoms reported were correlated with daily stress levels as measured by the Daily Stress Inventory for both groups. Yet, the number of symptoms reported by our head-injured group did not vary significantly from the normal subjects. The data support models which predict that postconcussion syndrome varies with stress, but the evidence for a reduction in the cerebral reserve capacity after head injury was not supported with this population. Explanations for this finding are presented and implications of this research and directions for future research are outlined.

Behavioral assessment and treatment of acquired visuoperceptual disorders.

Visuoperceptual deficits are common sequelae of damage to either hemisphere of the brain, but are typically more pronounced following injuries involving the right cerebral hemisphere. Common visuoperceptual disorders include visual field cuts, hemi-inattention and hemi-spatial neglect, hemi-perceptual deficits, and gaze and visual pursuit disturbances. A number of behavioral interventions have been developed to teach patients to compensate for acquired visual deficits. Studies addressing assessment and treatment issues in this area are reviewed, and future directions for research are outlined.