Auditory event-related responses are generated independently of ongoing brain activity

摘要: For researchers and clinical practitioners alike, evoked event-related responses measured with MEG EEG provide the means for studying human brain function dysfunction. However, generation mechanism of remains unclear, hindering our ability to formulate viable theories neural information processing. Event-related are assumed be generated either (1) separately ongoing, oscillatory activity or (2) through stimulus-induced reorganization ongoing activity. Here, we approached this issue examining single-trial auditory data in humans. We demonstrate that phase coherence over trials observed commonly used signal decomposition methods (e.g., wavelets) can result from both a phase-coherent state oscillations presence response which is additive oscillations. To avoid problem, introduce method based on amplitude variance establish relationship between responses. found stimuli do not give rise Further, increases spectral power accompany emergence responses, these accounted by linear summation oscillation stochastically distributed phase. Thus, basis observations, unique descriptors processing humans, processes separate