Spherical Harmonics Interpolation, Computation of Laplacians and Gauge Theory

Details Spherical Harmonics Interpolation, Computation of Laplacians and Gauge Theory Spherical Harmonics Interpolation, Computation of Laplacians and Gauge Theory

2002-06-03

arxiv.org/abs/physics/0206007v1

Physics

Medical Physics

14 pages, 3 figures. This is an internal Starlab Knowledge Nugget, with public status

Scientific paper

The aim in this note is to define an algorithm to carry out minimal curvature spherical harmonics interpolation, which is then used to calculate the Laplacian for multi-electrode EEG data analysis. The approach taken is to respect the data. That is, we implement a minimal curvature condition for the interpolating surface subject to the constraints determined from the multi-electrode data. We implement this approach using spherical harmonics interpolation. In this elegant example we show that minimization requirement and constraints complement each other to fix all degrees of freedom automatically, as occurs in gauge theories. That is, the constraints are respected, while only the orthogonal subspace minimization constraints are enforced. As an example, we discuss the application to interpolate control data and calculate the temporal sequence of laplacians from an EEG Mismatch Negativity (MMN) experiment (using an implementation of the algorithm in IDL).

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