| Popis: |
Publisher Summary In relating scalp-recorded event-related potentials (ERPs) to underlying brain activity on the one hand and psychological processes on the other, a key issue is the definition of ERP components. It is often assumed that the voltage peaks of scalp-recorded ERPs reflect distinct physiological processes within the brain, and that measuring the latency, amplitude and scalp distribution of each peak provides direct information on the timing, magnitude, and spatial extent of the intracranial neural processes that generated it. However, ERP peaks often represent composites of electrical activity arising from complex configurations of transmembrane current sources and sinks within more than one brain structure. The fusion of field potentials generated by different cellular elements within several concurrently active structures makes it difficult if not impossible to resolve the contribution of a particular structure or cellular group from the analysis of scalp recordings alone. |
