Actual versus self-reported scholastic achievement of litigating postconcussion and severe closed head injury claimants

Psychologists typically rely on patients' self-report of premorbid status in litigated settings. The authors examined the fidelity between self-reported and actual scholastic performance in litigating head injury claimants. The data indicated late postconcussion syndrome (LPCS) and severe closed head injury litigants retrospectively inflated scholastic performance to a greater degree than nonlitigating control groups. The LPCS group showed the highest magnitude of grade inflation, but discrepancy scores did not significantly correlate with a battery of malingering measures or with objective cerebral dysfunction. These findings support previous studies, which showed self-report is not a reliable basis for estimation of preinjury cognitive status. Retrospective inflation may represent a response shift bias shaped by an adversarial context rather than a form of malingering.     

A systematic investigation of same and cross modality priming using written and spoken responses

Effects of presentation modality and response format were investigated using visual and auditory versions of the word stem completion task. Study presentation conditions (visual, auditory, non-studied) were manipulated within participants, while test conditions (visual/written, visual/spoken, auditory/written, auditory/spoken, recall-only) were manipulated between participants. Results showed evidence for same modality and cross modality priming on all four word stem completion tasks. Words from the visual study list led to comparable levels of priming across all test conditions. In contrast, words from the auditory study list led to relatively low levels of priming in the visual/written test condition and high levels of priming in the auditory/spoken test condition. Response format was found to influence priming performance following auditory study in particular. The findings confirm and extend previous research and suggest that, for implicit memory studies that require auditory presentation, it may be especially beneficial to use spoken rather than written responses.     

Effects of stress and hippocampal NMDA receptor antagonism on recognition memory in rats

Exposures to uncontrollable stress have been shown to alter ensuing synaptic plasticity in the hippocampus and interfere with hippocampal-dependent spatial memory in rats. The present study examined whether stress, which impairs hippocampal long-term potentiation (LTP), also affects (nonspatial) hippocampal-dependent object-recognition memory, as tested on the visual paired comparison task (VPC) in rats. After undergoing an inescapable restraint–tailshock stress experience, rats exhibited markedly impaired recognition memory at the 3-h (long) familiarization-to-test phase delay but not at the 5-min (short) delay. In contrast, unstressed control animals showed robust recognition memory (i.e., they exhibited reliable preferences for novel over familiar objects) at both short- and long-delay periods. The impairing effect of stress on long-delay recognition memory was transient because 48 h after undergoing stress experience, animals performed normally at the long delay. Similar to stress, microinfusions of DL-2-amino-5-phosphonovaleric acid (APV), a competitive N-methyl-D-aspartate receptor (NMDAR) antagonist that blocks LTP, into the dorsal hippocampus selectively impaired object-recognition memory at the long-delay period. Together, these results suggest that stress and intrahippocampal administration of APV affect recognition memory by influencing synaptic plasticity in the hippocampus.

[The following individuals kindly provided reagents, samples, or unpublished information as indicated in the paper H. Blair.]

     

The liebowitz social anxiety scale as a self-report instrument: a preliminary psychometric analysis

The Liebowitz social anxiety scale (LSAS) is a commonly used clinician-administered instrument. The present study reports on the properties of a self-report version of the LSAS (LSAS-SR). About 175 participants diagnosed with social phobia participated in the study. The LSAS-SR showed overall good psychometric properties as indicated by the results of test-retest reliability, internal consistency, and convergent and discriminant validity. Furthermore, the scale was sensitive to treatment change. The construct validity of the LSAS-SR, however, remains to be further explored. These findings support the utility of the LSAS-SR, which has the advantage of saving valuable clinician time compared to the clinician-administered version.     

The Howard Crosby Warren Medal: psychology's first award

This article explores the development of the first major award given in American psychology, the Howard Crosby Warren Medal. Administered by the Society of Experimental Psychologists, the award was first given in 1936. The first recipients of the Howard Crosby Warren Medal were Ernest G. Wever and Charles W. Bray of Princeton University. The Howard Crosby Warren Medal remains among the most prestigious awards in American psychology.     

Disabilities and impairments: strategies for workplace integration

This article argues that disabilities are, within many of the U.S. debates, best understood as certain kinds of impairment affecting a person's capabilities to perform socially defined roles and functions within specific environments. We also argue that it is not the impairments per se that lead to claims about what we ought to do or ought not do for people with disabilities. Rather, it is only within the context of capabilities being linked to the concept of freedom--almost universally valued in the current U.S. socio-political environment--that disability issues take on an ethical tenor. Additionally, we link the notion of disability to that of social capital. In particular, we argue that any social organization that discriminates against people with disabilities by attenuating their opportunities within that environment also decreases the social cohesion that exists within that organization. Such corporate climates promote organizational structures and processes that fail to optimize facilitation of the mutual benefits of the members. Finally, we discuss three different kinds of accommodation strategy: assistive technologies, systemic personal change, and universal design. We suggest a case-based (casuistic) approach to problems caused by disabilities. Using methods from both philosophy and public policy, we then build policies for accommodations incrementally, based on an application of those methods to the cases, and resulting in a more nuanced process enabling the creation of policies that take account of the experiences of both disabled and non-disabled people.     

How many variables can humans process?

The conceptual complexity of problems was manipulated to probe the limits of human information processing capacity. Participants were asked to interpret graphically displayed statistical interactions. In such problems, all independent variables need to be considered together, so that decomposition into smaller subtasks is constrained, and thus the order of the interaction directly determines conceptual complexity. As the order of the interaction increases, the number of variables increases. Results showed a significant decline in accuracy and speed of solution from three-way to four-way interactions. Furthermore, performance on a five-way interaction was at chance level. These findings suggest that a structure defined on four variables is at the limit of human processing capacity.     

Cognitive capacities for behavioural flexibility in wild chimpanzees (Pan troglodytes): the effect of snare injury on complex manual food processing

In chimpanzees, it is only in the restricted context of tool use that manual and cognitive skills have been described, comparable to those that gorillas and orang-utans display in obtaining plant foods. We report the complex food preparation skills used to eat, without tools, the leaves of the tree Broussonettia papyrifera in the Sonso community of chimpanzees at Budongo Forest, Uganda. Able-bodied individuals used multi-stage techniques that required bimanual role differentiation at several stages, and were hierarchical in organisation. A total repertoire of 14 techniques was found, with strong preference in all individuals for either of two of these; 6 additional techniques were found when flowers and leaves were eaten together. However, in this community over 20% of individuals suffer from some form of upper- or lower-limb injury as a result of snares. We investigated the manner of compensation for upper-limb injury. Only the most severely injured showed reduced feeding efficiency. Injured individuals were found to use the same repertoire of techniques as able-bodied chimpanzees. We found no evidence to suggest that injured individuals were able to develop wholly novel techniques optimal for their specific injuries, although shifts in preference for particular techniques did occur. Rather, injured individuals used novel ways of achieving particular steps in the process; by "working around" their impairments; in this way, they managed to use the same techniques as the able-bodied. Since snare injuries generally befall young animals, these results suggest that chimpanzees learn techniques partly through observational learning (of, necessarily, able-bodied individuals). Accepted after revision: 8 February 2001 Electronic Publication