[Spatial spectra of neural electric activities and their application in study of visual spatial selective attention]

In this paper, the spatial spectra of neural electric activities and their primary application to visual spatial selective attention are presented. Based on the spherical harmonic spectra inversion by equivalent distributed dipole layer technique, novel latitude spectra S(1) and longitudinal spectra S(m) are defined as the description of spatial spectra of brain electric activities. When the latitude and longitudinal spectra are applied to the event-related potentials (ERP) of spatial selective attention to the right and left visual fields, the temporal structures of spatial spectra of all temporal sample points show meaningful delay and amplitude differences of components between 100 ms and 200 ms for attended and unattended stimulus conditions. These facts indicate that the latitude and longitudinal spatial spectra concept is useful in study of cognitive brain research.