An integrative transcranial magnetic stimulation mapping technique using non-linear curve fitting.

Abstract:

:The aim of this study is to develop a new simple method for analyzing one-dimensional transcranial magnetic stimulation (TMS) mapping studies in humans. Motor evoked potentials (MEP) were recorded from the abductor pollicis brevis (APB) muscle during stimulation at nine different positions on the scalp along a line passing through the APB hot spot and the vertex. Non-linear curve fitting according to the Levenberg-Marquardt algorithm was performed on the averaged amplitude values obtained at all points to find the best-fitting symmetrical and asymmetrical peak functions. Several peak functions could be fitted to the experimental data. Across all subjects, a symmetric, bell-shaped curve, the complementary error function (erfc) gave the best results. This function is characterized by three parameters giving its amplitude, position, and width. None of the mathematical functions tested with less or more than three parameters fitted better. The amplitude and position parameters of the erfc were highly correlated with the amplitude at the hot spot and with the location of the center of gravity of the TMS curve. In conclusion, non-linear curve fitting is an accurate method for the mathematical characterization of one-dimensional TMS curves. This is the first method that provides information on amplitude, position and width simultaneously.

journal_name

J Neurosci Methods

authors

Kohl AS,Conforto AB,Z'Graggen WJ,Kaelin-Lang A

doi

10.1016/j.jneumeth.2006.04.018

subject

Has Abstract

pub_date

2006-10-30 00:00:00

pages

278-84

issue

2

eissn

0165-0270

issn

1872-678X

pii

S0165-0270(06)00202-0

journal_volume

157

pub_type

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