title: Neuronal correlates of reduced memory performance in overweight subjects.
abstract: There is growing evidence that excessive body weight correlates with impaired cognitive performance like executive function, attention and memory. In our study, we applied a visual working memory task to quantify associations between body weight and executive function. In total, 34 lean (BMI 22±2.1 kg/m(2)) and 34 obese (BMI 30.4±3.2 kg/m(2)) subjects were included. Magnetic brain activity and behavioral responses were recorded during a one-back visual memory task with food and non-food pictures, which were matched for color, size and complexity. Behavioral responses (reaction time and accuracy) were reduced in obese subjects independent of the stimulus category. Neuronal activity at the source level showed a positive correlation between the right dorsolateral prefrontal cortex (DLPFC) activity and BMI only for the food category. In addition, a negative correlation between BMI and neuronal activity was observed in the occipital area for both categories. Therefore we conclude that increased body weight is associated with reduced task performance and specific neuronal changes. This altered activity is probably related to executive function as well as encoding and retrieval of information.
authors.affiliation: MEG Center, University Tübingen, Germany. krunoslav.stingl@med.uni-tuebingen.de
authors.forename: Krunoslav T
authors.initials: KT
authors.lastname: Stingl
authors.forename: Stephanie
authors.initials: S
authors.lastname: Kullmann
authors.forename: Caroline
authors.initials: C
authors.lastname: Ketterer
authors.forename: Martin
authors.initials: M
authors.lastname: Heni
authors.forename: Hans-Ulrich
authors.initials: HU
authors.lastname: Häring
authors.forename: Andreas
authors.initials: A
authors.lastname: Fritsche
authors.forename: Hubert
authors.initials: H
authors.lastname: Preissl
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008568:Memory / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D050177:Overweight / Q000503:physiopathology*