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Updated: Jan 26, 2026

Visualization of Cortical Modules in Flattened Mammalian Cortices
Published on: January 22, 2018
Exenatide modulates visual cortex responses
Paola Binda1, Roy Eldor2, Claudia Huerta3
1Department of Translational Research on New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy.
Glucagon-like peptide-1 (GLP-1) analogues like exenatide impact brain activity in visual cortex areas. This influences how lean and obese individuals process visual stimuli, potentially affecting food-related behaviors.
Area of Science:
- Neuroscience
- Metabolic research
- Neuroimaging
Background:
- Metabolism significantly influences brain physiology.
- Glucagon-like peptide-1 (GLP-1) is a key metabolic hormone.
- The neural effects of GLP-1 on visual processing are not fully understood.
Purpose of the Study:
- To investigate the impact of GLP-1 on visual-evoked functional Magnetic Resonance Imaging (fMRI) responses in cortical areas.
- To compare the effects of GLP-1 in lean versus obese individuals.
- To explore GLP-1's influence on the processing of food-related visual stimuli.
Main Methods:
- Functional Magnetic Resonance Imaging (fMRI) was used to measure brain activity.
- Participants (lean and obese) received either exenatide (a GLP-1 agonist) or a saline infusion.
- Brain responses to visual stimuli (food and nonfood images) were recorded and analyzed.
Main Results:
- Exenatide abolished the preference for food images in the temporal pole, unlike saline.
- Exenatide enhanced responses in early visual areas (extrastriate occipital) to both food and nonfood images.
- Exenatide increased resting-state fMRI signals in occipital regions, inversely correlated with BMI.
Conclusions:
- Exenatide modulates neural processing in both early and higher-order visual cortex areas in lean and obese individuals.
- These findings suggest a mechanism by which GLP-1 analogues may influence food-related behaviors.
- Metabolic interventions targeting GLP-1 receptors show promise for modulating brain function related to appetite and visual processing.
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