Schematic depiction of the MEG field and gradient maps of neural activity in response to amplitude modulations delivered at different temporal rates (2, 4, 10 and 20 Hz). Source localization of these field maps suggested different sources in auditory cortex for the slower (2 Hz, 4 Hz) and faster (10 Hz, 20 Hz) rates. Dyslexic participants showed significantly reduced phase locking compared to control participants in auditory cortex in the right hemisphere for 2 Hz amplitude modulationstimulation. Figure reproduced with permission from Hämäläinen et al. (2012).