Cortical Oscillations in Auditory Perception and Speech: Evidence for Two Temporal Windows in Human Auditory Cortex

摘要: Natural sounds, including vocal communication contain critical information at multiple time scales. Two essential temporal modulation rates in speech have been argued to be the low gamma band (~20-80 ms duration information) and theta (~150-300 ms), corresponding segmental syllabic rates, respectively. On one hypothesis, auditory cortex implements integration using constants closely related these values. The neural correlates of a proposed dual window mechanism human remain poorly understood. We recorded MEG responses from participants listening non-speech stimuli with different structures, created by concatenating frequency-modulated segments varied segment durations. show that structure matching speech-relevant scales (~25 ~200 ms) elicit reliable phase tracking associated oscillatory frequencies (low bands). In contrast, non-matching do not. Furthermore, topography shows rightward lateralization while occurs bilaterally. results support hypothesis there exists multi-time resolution processing on discontinuous provide evidence for an asymmetric organization analysis (asymmetrical sampling time, AST). data argue macroscopic-level underlying processing: sliding resetting intrinsic windows privileged