Task-related potential at electrode position FC3 during the presentation of the auditory probe task. Stimulus onset t = 0, stimulus end t = 3000 ms. Grand Average including nine subjects ('map' group) with > 45 single presentations each. The averaging process preserves the interindividually invariant signal components, such as the negative DC plateau and the superimposed ERP peaks (bimodal combination at a latency of 100 ms/200 ms + n * 600 ms) that are evoked by the single tones the stimulus is composed of. The top of the shaded triangles indicate the DC level that is obtained by time-averaging the signal over 1-second time windows; the resulting 30-electrode topographic interpolations are attached to the tips of the respective triangles. Statistical analysis and cortical imaging in the results section is based on the time window [1000 ms, 3000 ms] after stimulus onset.
Bangert and Altenmüller BMC Neuroscience 2003 4:26 doi:10.1186/1471-2202-4-26