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. 2009 Aug;53(1):44-9.
doi: 10.1016/j.appet.2009.04.220. Epub 2009 May 6.

Asymmetric prefrontal cortex activation in relation to markers of overeating in obese humans

Christopher N Ochner  1 , Deborah Green, J Jason van Steenburgh, John Kounios, Michael R Lowe
Affiliations

Asymmetric prefrontal cortex activation in relation to markers of overeating in obese humans

Christopher N Ochner et al. Appetite. 2009 Aug.

Abstract

Dietary restraint is heavily influenced by affect, which has been independently related to asymmetrical activation in the prefrontal cortex (prefrontal asymmetry) in electroencephalograph (EEG) studies. In normal weight individuals, dietary restraint has been related to prefrontal asymmetry; however, this relationship was not mediated by affect. This study was designed to test the hypotheses that, in an overweight and obese sample, dietary restraint as well as binge eating, disinhibition, hunger, and appetitive responsivity would be related to prefrontal asymmetry independent of affect at the time of assessment. Resting EEG recordings and self-report measures of overeating and affect were collected in 28 overweight and obese adults. Linear regression analyses were used to predict prefrontal asymmetry from appetitive measures while controlling for affect. Cognitive restraint and binge eating were not associated with prefrontal asymmetry. However, disinhibition, hunger, and appetitive responsivity predicted left-, greater than right-, sided prefrontal cortex activation independent of affect. Findings in this study add to a growing literature implicating the prefrontal cortex in the cognitive control of dietary intake. Further research to specify the precise role of prefrontal asymmetry in the motivation toward, and cessation of, feeding in obese individuals is encouraged.

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Figures

Figure 1
Figure 1
Topographic map of the relationship (standardized coefficient [Beta]) between log-transformed scalp alpha-power hemispheric asymmetry scores across all electrode sites, and scores on the Power of Food Scale (PFS). The map was created by computing Beta for homologous pairs of electrodes. These coefficients were then used to generate a spline-interpolated map on a lateral view of the head. Each green dot represents the location of an electrode, and the arrow denotes the region of the prefrontal cortex. Orange and red regions on the map (Beta coefficients) reflect the positive relationship between Appetitive Responsivity and alpha asymmetry. That is, more neural activity (lower alpha power) measured at left-hemisphere electrodes for each corresponding (hemispheric) pair of electrodes in relation to PFS scores. Only Beta coefficients significant at p < 0.05 are shown.
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