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Localization of human supratemporal auditory areas from intracerebral auditory evoked potentials using distributed
Blaise Yvert1, Catherine Fischer, Olivier Bertrand
1Inserm Unité 280, Bron, France. b.yvert@lnr.u-bordeaux1.fr
Neuroimage
|July 26, 2005
Summary
We adapted source localization for intracranial data to map auditory brain activity. This revealed a consistent spatiotemporal pattern in supratemporal auditory areas, aiding epilepsy surgery planning.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Brain Imaging
Background:
- Source localization methods are crucial for understanding brain activity from EEG/MEG.
- Intracranial signals offer higher detail than scalp recordings but require adapted localization techniques.
- Previous methods have not been optimized for localizing intracerebral signal sources.
Purpose of the Study:
- To adapt the minimum current estimates (MCE) method for localizing supratemporal sources of auditory evoked potentials from intracranial data.
- To identify the spatiotemporal pattern of auditory activation within 100 ms of stimulus onset.
- To evaluate the potential clinical applications of this method, such as in epilepsy surgery.
Main Methods:
- Adaptation of the minimum current estimates (MCE) method for intracranial electrophysiological data.
- Localization of auditory 1-kHz-tone-evoked potentials within 100 ms post-stimulus onset.
- Analysis of spatiotemporal activity patterns across individual subjects' supratemporal auditory regions.
Main Results:
- A common spatiotemporal activation pattern was identified across subjects in the Heschl's gyrus (H1), Heschl's sulcus (HS), Planum Temporale (PT), H2/H3, and superior temporal gyrus (STG).
- Four distinct time periods of activity (P0, Na, Pa/Pb, N100) corresponded to specific patterns of supratemporal activation and propagation.
- Reconstruction of scalp data from identified intracerebral sources successfully reproduced classical auditory evoked potentials.
Conclusions:
- The adapted MCE method effectively localizes supratemporal auditory sources using intracerebral data, revealing detailed spatiotemporal activation patterns.
- This technique can map auditory processing on individual anatomy, offering potential for pre-surgical planning in epilepsy.
- The findings contribute to a better understanding of early auditory processing in the human brain.