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Using the Activity-based Anorexia Rodent Model to Study the Neurobiological Basis of Anorexia Nervosa
Published on: October 22, 2015
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Altered cortical excitability in anorexia nervosa.
E M Khedr1, N A El Fetoh1, E El Bieh2
1Department of neuropsychiatry, department of neurology, faculty of medicine, Assiut university hospital, 71111 Assiut, Egypt.
Neurophysiologie Clinique = Clinical Neurophysiology
|September 22, 2014
Summary
Individuals with anorexia nervosa (AN) exhibit heightened motor and esophageal cortical excitability. This increased excitability in anorexia nervosa correlates with key clinical symptoms, suggesting a neurophysiological basis for the disorder.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Medicine
Background:
- Previous research suggests right-hemisphere hyperactivation in anorexia nervosa (AN) using EEG and PET.
- Cortical excitability has not been extensively studied in AN using transcranial magnetic stimulation (TMS).
Purpose of the Study:
- To investigate cortical excitability in individuals with AN using TMS.
- To compare TMS measures between AN patients and healthy controls.
Main Methods:
- Thirteen AN patients and 14 controls underwent clinical assessments (EDI, EAT, BDI-II).
- TMS assessed resting motor threshold (RMT), active motor threshold (AMT), motor evoked potentials (MEP), cortical silent period (CSP), transcallosal inhibition (TCI), short latency intracortical inhibition (SICI), and esophageal MEP latencies (CL).
Main Results:
- AN patients showed significantly reduced RMT, MEP onset latency (FDI and esophagus), and TCI duration compared to controls.
- No significant differences in AMT or CSP were observed between groups.
- Negative correlations were found between EAT scores and RMT/TCI duration; no correlation with BDI-II scores.
Conclusions:
- Anorexic individuals display increased motor and esophageal cortical excitability.
- This heightened excitability is linked to clinical symptoms of anorexia nervosa.
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