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12 - Diffusion Potentials in Brain Tissue

Published online by Cambridge University Press:  30 May 2024

Geir Halnes
Affiliation:
Norwegian University of Life Sciences
Torbjørn V. Ness
Affiliation:
Norwegian University of Life Sciences
Solveig Næss
Affiliation:
Universitetet i Oslo
Espen Hagen
Affiliation:
Universitetet i Oslo
Klas H. Pettersen
Affiliation:
The Norwegian Artificial Intelligence Research Consortium
Gaute T. Einevoll
Affiliation:
Norwegian University of Life Sciences
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Summary

The diffusion of ions in the extracellular space of the brain is normally assumed to have negligible effects on extracellular potentials. However, during periods of intense neural activity or in pathological conditions such as spreading depression, concentration gradients in brain tissue can become quite pronounced, and the effects of diffusion on electric potentials cannot be a priori neglected. We here present the theory for computing diffusion potentials, and we evaluate whether diffusion potentials can become “visible” within the frequency range considered in standard LFP recordings.

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Chapter
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Electric Brain Signals
Foundations and Applications of Biophysical Modeling
, pp. 289 - 308
Publisher: Cambridge University Press
Print publication year: 2024

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