Association between dyads and correct responses on the Paced Auditory Serial Addition Task (PASAT)

The sensitivity of the Paced Auditory Serial Addition Task (PASAT) to working memory deficits may be enhanced by examining "dyads" (i.e., correct responses immediately preceded by a correct response) as a complement to the traditional total correct summary score. In a sample of 397 mostly African American (79%) healthy adults, total dyad and total correct scores were highly correlated (r = .96, p < .001); however, the magnitude of this association diminished in faster stimulus presentation trials, particularly among participants with impaired working memory abilities.     

Beauty and the beast: Psychobiologic and evolutionary perspectives on body dysmorphic disorder

Body dysmorphic disorder (BDD) is characterized by preoccupation with a defect in appearance. Concepts of beauty play a particularly crucial role in humans' mental and social life, and may have specific psychobiologic and evolutionary underpinnings. In particular, there is a growing literature on the neurocircuitry underpinning the body schema, body image and facial expression processing, and aesthetic and symmetry judgments. Speculatively, disruptions in cognitive-affective processes relevant to judgements about physical beauty lead to BDD.     

Re-visiting the competence/performance debate in the acquisition of the counting principles

Advocates of the "continuity hypothesis" have argued that innate non-verbal counting principles guide the acquisition of the verbal count list (Gelman & Galistel, 1978). Some studies have supported this hypothesis, but others have suggested that the counting principles must be constructed anew by each child. Defenders of the continuity hypothesis have argued that the studies that failed to support it obscured children's understanding of counting by making excessive demands on their fragile counting skills. We evaluated this claim by testing two-, three-, and four-year-olds both on "easy" tasks that have supported continuity and "hard" tasks that have argued against it. A few noteworthy exceptions notwithstanding, children who failed to show that they understood counting on the hard tasks also failed on the easy tasks. Therefore, our results are consistent with a growing body of evidence that shows that the count list as a representation of the positive integers transcends pre-verbal representations of number.     

The least likely of times: how remembering the past biases forecasts of the future

Atypical events are both memorable and unrepresentative of their class. We tested the hypotheses that (a) people tend to recall atypical instances of events, and (b) when they are unaware of this, they rely on these atypical instances in forecasting their affective reactions to future events. In three studies, participants who were asked to recall an instance of an event and participants who were asked to recall an atypical instance of an event recalled equally atypical instances. However, only the former participants made extreme forecasts about their reactions to future events. The results suggest that the impact bias (the tendency to overestimate the affective impact of future events) may be due in part to people's reliance on highly available but unrepresentative memories of the past.     

A PRELIMINARY ANALYSIS OF THE EFFECTS OF PRIOR CLASSROOM CONDITIONS ON PERFORMANCE UNDER ANALOGUE ANALYSIS CONDITIONS

We systematically manipulated two prior classroom conditions to explore their effects on performance under analogue assessments for a 7-year-old girl with severe intellectual disabilities who exhibited aggressive behavior. Results demonstrated consistently higher levels of aggression during demand analogue conditions when they were preceded by one of the classroom conditions.     

Social problem-solving in dual diagnosis patients

Social problem-solving skills among dual-diagnosis patients were compared to two control groups: psychiatric patients without substance abuse problems and community volunteers. A standardized, behavioral role-play test consisting of four scenarios representing interpersonal problems yielded two reliable dependent variables: (a) specificity, or elaboration, of the problem-solving response and (b) overall effectiveness of the response. Analyses of covariance (using a measure of intellectual function as the covariate) indicated that both dual-diagnosis patients and psychiatric controls were significantly poorer problem-solvers than were community controls. The overall pattern of the results indicated that deficits observed in a dual-diagnosis sample are not necessarily compounded due to the presence of the coexisting disorders. Implications of these findings, strengths and limitations of this study, and suggestions for future research are discussed.This research was supported in part by Grant DA04593-01 from the National Institute on Drug Abuse.Portions of this article were presented at the 22nd Annual Meeting of the Association for the Advancement of Behavior Therapy during November 1988 in New York.     

Kinematic analysis of limb movements in neuropsychological research: subtle deficits and recovery of function

In this brief review, we argue that a detailed analysis of the spatial and temporal characteristics of visually guided limb movements can provide important insights into the nature of neuropsychological deficits and the functional organization of the brain. In particular, we will show how kinematic analysis of a simple aiming movement can reveal differences that might not be apparent clinically in the behaviour of patients with unilateral brain lesions. We will argue that the subtle but distinctive deficits that follow damage to the left or right hemisphere can be related to the clinical syndromes of manual apraxia and hemispatial neglect, respectively. The fact that these deficits are apparent only with kinematic analysis demonstrates the potential of these techniques for evaluating recovery of function.