Figure 2.

Grand-averaged (N = 10) responses elicited by periodic (thick line), aperiodic (dashed line), and tonal (dotted line) excitation of the vowel /a/ and /u/, calculated over the pair of planar gradiometers displaying N1m response maxima above the left and right hemisphere. In all cases, the stimuli comprising natural periodic structure elicited a prominent N1m response peaking at around 120 ms after stimulus onset.

Tiitinen et al. BMC Neuroscience 2005 6:62   doi:10.1186/1471-2202-6-62
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