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Neurolinguistics Reference library
...of the MEG Sensing System The major advantage of MEG is that, in contrast to EEG, the magnetic fields are largely unaffected by in-homogeneities in the skull and scalp. Another important difference between MEG and EEG is that MEG is insensitive to current flows oriented perpendicularly to the scalp: only the tangential component of a current flow will produce a measurable field, while EEG measures the combination of radial and tangential sources. In practice, this implies that MEG is most sensitive to activity on the banks of sulci and less sensitive to...
Phonological Features Reference library
...articulators executes a limited set of behaviors. For example, the soft palate may be raised so as to prevent air from flowing through the nasal cavities, or it may be lowered to allow air to flow through and excite these cavities. The tongue body may be moved parallel and/or perpendicular to the spinal column; the lips may be rounded or spread, etc. In general, in the production of speech sounds, each articulator is independently controlled, so that the features executed by a given articulator are freely combinable with the features executed by any of the other...