ERP indices of resource allocation difficulties in mild head injury

Journal of Clinical and Experimental Neuropsychology
A K SolbakkC Nielsen

Abstract

This study examined the hypothesis that distractibility is a characteristic sequela of mild closed head injury (MHI). The Minnesota Multiphasic Personality Inventory (MMPI-2) was used to study whether comorbid stress-related symptoms are associated with behavioral and electrophysiological indexes of attention. Event-related potentials (ERPs) and performance (reaction time, accuracy) were studied in patients with MHI (n = 20), patients with frontal lesions (n = 14), and healthy controls (n = 20) during a three-tone oddball task. Participants were instructed to detect rare target (2000 Hz) tones, and to withhold responding to equally rare distractor (500 Hz) tones and frequently occurring standard (1000 Hz) tones. All groups distinguished the two classes of deviants as indicated by the larger P3 amplitude to target relative to distractor tones. This indicates that the group with MHI was capable of differential allocation of attentional resources to target and non-target events. However, impaired performance and attenuated ERP amplitudes to both classes of deviants relative to patients with frontal lesions and controls, suggest limited availability, or expenditure of the resources needed for adequate task performance. In the group...Continue Reading

Citations

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Jul 9, 2008·Neuropsychological Rehabilitation·Nadia ParéMichel Pépin
May 21, 2005·Journal of Clinical and Experimental Neuropsychology·Anne-Kristin SolbakkKjetil Sundet
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Oct 4, 2007·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Henry L LewJohn H Poole

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