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Fig. 8 | BMC Neuroscience

Fig. 8

From: Spectral-temporal EEG dynamics of speech discrimination processing in infants during sleep

Fig. 8

Schematic model of the spectral-temporal dynamics of auditory oddball discrimination. Time from stimulus onset is represented, arbitrarily, along the abscissa. Frequency in Hz is represented along the ordinate. In this schematic, a deviant stimulus initiates a gamma response, which is then shifted into a beta synchronization when the auditory signal differs from some expectation. This gamma-beta wave packet is coupled (CFC) with a theta oscillator, theta-1 (shown in blue). An additional theta oscillator, theta-2 (shown in red), is activated at a slight delay relative to the beta–gamma burst. The difference between these two theta oscillators reflects the degree to which the actual response differs from the expected response; that is, it reflects some amount of surprise to the deviant sound

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