Document Detail

Frontal attentional responses to food size are abnormal in obese subjects: an electroencephalographic study.
MedLine Citation:
PMID:  19616997     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Are obese subjects characterized by a reduction of attentional cortical responses to the enlargement of food or body images? METHODS: Electroencephalographic data were recorded in 19 obese and 15 normal-weight adults during an "oddball" paradigm. The subjects were given frequent (70%) and rare (30%) stimuli depicting faces (FACE), food (FOOD), and landscapes (CONTROL), and clicked the mouse after the rare stimuli. These stimuli depicted the same frequent stimuli graphically dilated by 25% along the horizontal axis. Bioelectrical impedance indexed subjects' body fat percentage. Cortical attentional responses were probed by the difference between positive event-related potentials peaking around 400-500ms post-stimulus for the rare minus frequent stimuli (P300). Low resolution electromagnetic source tomography (LORETA) estimated P300 sources. RESULTS: In the FOOD condition, the amplitude of medial prefrontal P300 sources (Brodmann area 9) was lower in the obese than normal-weight subjects, and there was a negative correlation between the body fat percentage and the amplitude of these sources in all subjects as a single group. CONCLUSIONS: These results disclose that prefrontal attentional processes to food size are abnormal in obese subjects. SIGNIFICANCE: The present study motivates future research evaluating the effects of cognitive rehabilitation in obese subjects.
Claudio Babiloni; Claudio Del Percio; Anna Valenzano; Nicola Marzano; Mario De Rosas; Annamaria Petito; Antonello Bellomo; Giuseppe Rossi; Brunello Lecce; Ciro Mundi; Roberta Lizio; Fabrizio Eusebi; Giuseppe Cibelli
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-18
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  120     ISSN:  1872-8952     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-08-14     Completed Date:  2009-08-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1441-8     Citation Subset:  IM    
Department of Biomedical Sciences, Bioagromed, University of Foggia, Foggia, Italy.
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MeSH Terms
Analysis of Variance
Attention / physiology*
Body Composition
Body Mass Index
Body Weight
Brain Mapping
Cerebral Cortex / physiopathology*
Electroencephalography / methods
Event-Related Potentials, P300 / physiology*
Middle Aged
Obesity* / complications,  pathology,  psychology
Pattern Recognition, Visual / physiology*
Perceptual Disorders / etiology*
Photic Stimulation / methods
Reaction Time / physiology
Young Adult

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