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This study investigated the effect of traumatic brain injury on the development of posttraumatic stress disorder (PTSD). Subjects were 107 motor vehicle accident survivors including 38 individuals who were diagnosed with posttraumatic stress disorder (PTSD). Neuropsychological testing was administered to all subjects during an initial diagnostic evaluation.(More)
Two studies were conducted to test the hypothesis that exposure to noncontingent escape leads to performance deficits similar to those observed when subjects are exposed to noncontingent aversive outcomes from which there is no escape, and that causal attributions mediate these deficits. Previous attempts to produce "appetitive helplessness" (deficits(More)
Two studies tested a basic hypothesis of the learned helplessness model: That performance deficits associated with exposure to uncontrollable outcomes are directly mediated by an individual's perception of response-outcome independence. In the first experiment 48 subjects were exposed to noise bursts. For one experimental group, the termination of the noise(More)
This study investigated if the appearance and diagnostic accuracy of HMPAO brain perfusion SPECT images could be improved by using CT-based attenuation and scatter correction compared with the uniform attenuation correction method. A cohort of subjects who were clinically categorized as Alzheimer's Disease (n = 38), Dementia with Lewy Bodies (n = 29) or(More)
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