bridged_electrodes.h File Reference

Detection of electrically bridged EEG electrodes via the Electrical Distance metric. More...

#include "dsp_global.h"
#include <Eigen/Core>
#include <QPair>
#include <QList>

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Classes
struct	UTILSLIB::BridgedElectrodeParams

Namespaces
namespace	FIFFLIB
	FIFF file I/O, in-memory data structures and high-level readers/writers.
namespace	UTILSLIB
	Shared utilities (I/O helpers, spectral analysis, layout management, warp algorithms).

Functions
DSPSHARED_EXPORT Eigen::MatrixXd	UTILSLIB::computeElectricalDistance (const Eigen::MatrixXd &data, const FIFFLIB::FiffInfo &info)
	Compute electrical distance matrix between EEG channels.
DSPSHARED_EXPORT QList< QPair< int, int > >	UTILSLIB::computeBridgedElectrodes (const Eigen::MatrixXd &data, const FIFFLIB::FiffInfo &info, const BridgedElectrodeParams &params=BridgedElectrodeParams())
	Detect bridged EEG electrodes.

Detailed Description

Detection of electrically bridged EEG electrodes via the Electrical Distance metric.

SPDX-License-Identifier: BSD-3-Clause Copyright (c) 2026 MNE-CPP Authors

Author

Christoph Dinh chris.nosp@m.toph.nosp@m..dinh.nosp@m.@mne.nosp@m.-cpp..nosp@m.org

Since

2.2.1

Date

May 2026

Two EEG electrodes are said to be bridged when conductive paste, sweat or skin abrasion creates a low-impedance shortcut between them; the recorded signals then become near-identical and any subsequent source localisation is biased. Following Tenke & Kayser (2001, Clin. Neurophysiol. 112) the detector computes the Electrical Distance — the time-domain variance of the difference signal — for every channel pair, and flags pairs whose normalised distance falls below a user-defined threshold (default 0.3).

The implementation operates on the raw broadband signal; no rereferencing or filtering is required up-front. Output is a list of (i, j) channel- index pairs that the caller can mark bad, interpolate, or pass into the SSS bad-channel set.

Definition in file bridged_electrodes.h.