Browsing by Subject "Frontal cortical asymmetry."
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Item Frontal cortical asymmetry and impulsive aggression.(2011-12-19) Lake, Sarah Laurie.; Stanford, Matthew S.; Psychology and Neuroscience.; Baylor University. Dept. of Psychology and Neuroscience.The present study uses individuals who display impulsive aggressive outbursts and measures resting frontal cortical activity. Impulsive aggression (IA) is described as a reactive or emotionally charged aggressive response characterized by a loss of behavioral control. Previous physiological studies have found IAs have sensory and informational processing deficits. Undergraduate volunteers were recruited for an 8min resting EEG with 1min blocks of eyes open or closed. Age- and gender-matched controls reported no aggressive outbursts and a score below 4 on the BDHI. Statistical differences were found between IAs and controls in both the midfrontal [t(22) = 2.743, p < .01] and lateral frontal [t(22) = 2.365, p < .05] regions, with IAs having more right resting activity than controls. Due to the nature of IA as a trait in the current sample, this study lends evidence towards resting frontal asymmetry as a marker for susceptibility to psychopathology.Item Frontal lobe asymmetry and impulsive aggression : a reinforcement sensitivity study.(2014-01-28) Lake, Sarah Laurie.; Stanford, Matthew S.; Psychology and Neuroscience.; Baylor University. Dept. of Psychology and Neuroscience.The current study compared impulsive aggressive individuals and nonaggressive controls using frontal cortical EEG activity. Impulsive aggression is a reactive or emotionally charged violent response characterized by a loss of behavioral control. Previous physiological studies have found impulsive aggressors (IAs) have sensory and informational processing deficits. Undergraduate male volunteers (n = 15 IAs, n = 15 controls) completed a resting EEG and two affective picture tasks intended to manipulate emotional state. IAs showed more right frontal cortical activity than controls at lateral frontal electrodes at rest [t(28) = 2.470, p = .020] and had similar asymmetry indices throughout the two emotional paradigms [t(14) = .890, ns]. Controls, however, were able to engage the Behavioral Inhibition System (BIS) during withdrawal-related stimuli [t(14) = 2.576, p = .022]. An interaction between group and picture task [F(2, 14) = 3.818, p = .028] reinforced this result. Results indicated that IAs have an overactive BIS and thus cannot appropriate the proper biological systems in response to emotional stimuli. Future directions are discussed.