UTILSLIB::ConnectivityAec Class Reference

Amplitude Envelope Correlation connectivity. More...

#include <connectivity_aec.h>

Static Public Member Functions
static Eigen::MatrixXd	compute (const Eigen::MatrixXd &matData)
static Eigen::MatrixXd	computeOrthogonalized (const Eigen::MatrixXd &matData)
static Eigen::VectorXd	hilbertEnvelope (const Eigen::VectorXd &signal, int nFft=0)
static double	pearsonCorrelation (const Eigen::VectorXd &a, const Eigen::VectorXd &b)

Detailed Description

Amplitude Envelope Correlation connectivity.

Definition at line 45 of file connectivity_aec.h.

Member Function Documentation

compute()

MatrixXd ConnectivityAec::compute ( const Eigen::MatrixXd & matData )

static

Compute AEC between all pairs of signals.

Steps: Hilbert envelope → Pearson correlation of envelopes.

Parameters

[in]

matData

Bandpassed data (n_signals x n_samples).

Returns

Symmetric connectivity matrix (n_signals x n_signals) with values in [-1, 1].

Definition at line 39 of file connectivity_aec.cpp.

computeOrthogonalized()

MatrixXd ConnectivityAec::computeOrthogonalized ( const Eigen::MatrixXd & matData )

static

Compute orthogonalized AEC (corrected for volume conduction / source leakage).

For each pair (i, j): orthogonalize j w.r.t. i, compute envelope correlation, then symmetrise by averaging AEC(i→j) and AEC(j→i).

Parameters

[in]

matData

Bandpassed data (n_signals x n_samples).

Returns

Symmetric connectivity matrix (n_signals x n_signals) with values in [0, 1].

Definition at line 69 of file connectivity_aec.cpp.

hilbertEnvelope()

VectorXd ConnectivityAec::hilbertEnvelope ( const Eigen::VectorXd & signal, int nFft = 0 )

static

Compute the analytic signal envelope via Hilbert transform (using FFT), like numpy.abs(scipy.signal.hilbert(signal, N=nFft)[:n_samples]).

Parameters

[in]	signal	Real-valued signal (n_samples).
[in]	nFft	FFT length (zero padding), at least n_samples; 0 for n_samples.

Returns

Envelope (n_samples) — absolute value of analytic signal.

Definition at line 122 of file connectivity_aec.cpp.

pearsonCorrelation()

double ConnectivityAec::pearsonCorrelation ( const Eigen::VectorXd & a, const Eigen::VectorXd & b )

static

Pearson correlation between two vectors.

Parameters

[in]	a	First vector.
[in]	b	Second vector (same length).

Returns

Correlation coefficient in [-1, 1].

Definition at line 150 of file connectivity_aec.cpp.

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The documentation for this class was generated from the following files:

• src/libraries/dsp/connectivity_aec.h
• src/libraries/dsp/connectivity_aec.cpp