Despite growing interest in temporal aspects of auditory neural processing,
little is known about large-scale timing patterns of brain activity during
the perception of auditory sequences. This is partly because it has not
been possible to distinguish
stimulus-related activity from other, endogenous brain signals recorded
by electrical or magnetic sensors. Here we use amplitude modulation of
unfamiliar, ~1-minute-long tone sequences to label stimulus-related magnetoencephalographic
neural activity in human subjects. We show that temporal patterns of activity
recorded over particular brain regions track the pitch contour of tone
sequences, with the accuracy of tracking increasing as tone sequences become
more predictable in structure. In contrast, temporal synchronization between
recording locations, particularly between sites over the left posterior
hemisphere and the rest of the brain, is greatest when sequences have melody-like
statistical properties, which may reflect the perceptual integration of
local and global pitch patterns in melody-like sequences. This method is
particularly well suited to studying temporal neural correlates of complex
auditory sequences (such as speech or music) which engage multiple brain
areas as perception unfolds in time.