Adaptive spatial filters for electromagnetic brain imaging

Neural activity in the human brain generates coherent synaptic and intracellular currents in cortical columns that create electromagnetic signals which canbe measured outside the head using magnetoencephalography (MEG) and electroencephalography (EEG). Electromagnetic brain imaging refers to techniques that reconstruct neural activity from MEG and EEG signals. Electromagnetic brain imaging is unique among functional imaging techniques for its ability to provide spatio-temporal brain activation profiles that reflect not only where the activity occurs in the brain but also when this activity occurs in relation to external and internal cognitive events, as well as to activity in other brain regions. Adaptive spatial filters are powerful algorithms for electromagnetic brain imaging that enable high-fidelity reconstruction of neuronal activity. Provides an comprehensive introduction into the basics of beamforming Essential knowledge for neuromagnetic imaging devices INDICE: Introduction.- Sensor array outputs and spatial filters.- Tomographic reconstruction and nonadaptive spatial filters.- Adaptive spatial filters.- Location bias, spatial resolution and beam response.- Output SNR and array mismatch.- Effects of low-rank interference.- Effects of high-rank interference.- Effects of source correlation.- Effects of using the sample covariance matrix.- Statistical evaluation of filter outputs.- Methods related to adaptive spatial filters.- Appendices.

• ISBN: 978-3-540-79369-4
• Editorial: Springer
• Encuadernacion: Cartoné
• Páginas: 250
• Fecha Publicación: 01/06/2008
• Nº Volúmenes: 1
• Idioma: Inglés