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Free keywords:
Alpha; Attention; Brain; ERP; Gamma; Generator; N1; P1; P3; Oscillations
Abstract:
Electrophysiological and hemodynamical responses of the brain allow investigation of the neural origins of human attention. We review
attention-related brain responses from auditory and visual tasks employing oddball and novelty paradigms. Dipole localization and intra-
cranial recordings as well as functional magnetic resonance imaging reveal multiple areas involved in generating and modulating attentional
brain responses. In addition, the in ̄uence of brain lesions of circumscribed areas of the human cortex onto attentional mechanisms are
reviewed. While it is obvious that damaged brain tissue no longer functions properly, it has also been shown that functions of non-lesioned
brain areas are impaired due to loss of modulatory in ̄uence of the lesioned area. Both early +P1 and N1) and late +P3) event-related potentials
are modulated by excitatatory and inhibitory mechanisms.. Oscillatory EEG-correlates of attention in the alpha and gamma frequency range
also show attentional modulation.
