This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Recently an Implantable Gastric Stimulating (IGS) device has been developed which generates electric signals to induce the expansion of the fundus which may trigger the gastrointestinal system to release satiety signals. A great proportion of obese subjects using the device show significant reduction in body weight (better responders). However, some obese subjects do not show a significant response (poor responders). It is possible that the poor responders have higher metabolic activity in the orbitofrontal cortex than the better responders. This study will attempt to evaluate brain glucose metabolic changes using Positron Emission Tomography (PET) during activation and deactivation of the IGS in the better responders and in the poor responders.
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