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Source modeling of esophageal evoked potentials
H Franssen1, B L Weusten, G H Wieneke
1Department of Clinical Neurophysiology (F.02.230), Rudolf Magnus Research School in the Neurosciences, University Hospital Utrecht, The Netherlands.
Electroencephalography and Clinical Neurophysiology
|March 1, 1996
Summary
Esophageal evoked potentials (EEPs) recorded from the scalp originate from brain regions including the cingulate gyri and insular cortex. Lower brain-stem activity does not contribute to scalp-recorded EEPs.
Area of Science:
- Neuroscience
- Gastroenterology
- Somatosensory Evoked Potentials
Background:
- Esophageal stimulation via balloon distension can elicit measurable evoked potentials on the scalp.
- Understanding the central processing of esophageal sensory information is crucial for diagnosing visceral hypersensitivity and related disorders.
Purpose of the Study:
- To determine the number and precise anatomical locations of the neural sources generating the esophageal evoked potential (EEP).
Main Methods:
- Recording of EEPs from 32 scalp electrodes in 5 healthy human subjects.
- Application of spatio-temporal dipole modeling to analyze EEP data between 185 and 525 milliseconds post-stimulation.
Main Results:
- The EEP signal was best modeled by three distinct dipole sources: one midline dipole and two lateral dipoles.
- Dipole locations suggest neural activity originating from the cingulate gyri and insular cortex.
- No significant contribution from lower brain-stem structures to the scalp-recorded EEP was identified.
Conclusions:
- The primary generators of scalp-recorded esophageal evoked potentials are likely located within the cingulate gyri and insular cortex.
- These findings provide valuable insights into the central neural pathways processing esophageal afferent signals.