MINIMUMNORMESTIMATE
Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help minimumnormestimate”.
MINIMUMNORMESTIMATE computes a linear estimate of the current in a distributed source model. Use as [dipout] = minimumnormestimate(dip, grad, headmodel, dat, ...) Optional input arguments should come in key-value pairs and can include 'noisecov' = Nchan x Nchan matrix with noise covariance 'noiselambda' = scalar value, regularisation parameter for the noise covariance matrix (default = 0) 'sourcecov' = Nsource x Nsource matrix with source covariance (can be empty, the default will then be identity) 'lambda' = scalar, regularisation parameter (can be empty, it will then be estimated from snr) 'snr' = scalar, signal to noise ratio 'reducerank' = reduce the leadfield rank, can be 'no' or a number (e.g. 2) 'normalize' = normalize the leadfield 'normalizeparam' = parameter for depth normalization (default = 0.5) 'keepfilter' = 'no' or 'yes', keep the spatial filter in the output 'prewhiten' = 'no' or 'yes', prewhiten the leadfield matrix with the noise covariance matrix C 'scalesourcecov' = 'no' or 'yes', scale the source covariance matrix R such that trace(leadfield*R*leadfield')/trace(C)=1 Note that leadfield normalization (depth regularisation) should be done by scaling the leadfields outside this function, e.g. in prepare_leadfield. Note also that with precomputed leadfields the normalization parameters will not have an effect. This implements * Dale AM, Liu AK, Fischl B, Buckner RL, Belliveau JW, Lewine JD, Halgren E (2000): Dynamic statistical parametric mapping: combining fMRI and MEG to produce high-resolution spatiotemporal maps of cortical activity. Neuron 26:55-67. * Arthur K. Liu, Anders M. Dale, and John W. Belliveau (2002): Monte Carlo Simulation Studies of EEG and MEG Localization Accuracy. Human Brain Mapping 16:47-62. * Fa-Hsuan Lin, Thomas Witzel, Matti S. Hamalainen, Anders M. Dale, John W. Belliveau, and Steven M. Stufflebeam (2004): Spectral spatiotemporal imaging of cortical oscillations and interactions in the human brain. NeuroImage 23:582-595.