Fig. 6.

Time course and cortical topography of the mismatch negativity response elicited by frequency and speech deviants: time-amplitude dynamics of magnetic field gradients (deviant minus standard subtraction) at the sensor 0242 which exibited maximum response magnitude (middle), grand-mean MEG field topographies and distributed source models (L2 minimum-norm current estimates) for the early and late MMN deflection in the two hemispheres. ERF and source maps shown are taken at the response peak latency. For scaling, the maximum source activation at this time is taken as 100%.