Fig. 3.

Comparison of time courses for the event-triggered average signals for the hemodynamic and EEG responses. The different time scales of the signals are shown using an inset. Representative event-triggered average hemodynamic signals from one participant in one channel (channel 134) for faces (oxyHb, solid red; deoxyHb, solid magenta) and for objects (oxyHb, blue dashed; deoxyHb, cyan dashed). Black dotted line marks end of 18-s task period. Solid vertical line marks the 600 ms time period of the inset EEG signal. Inset: representative event-triggered EEG response from one participant showing N170 response in the Pz electrode for faces (red) with a smaller negative peak for objects (blue) shifted to a longer latency. Dotted lines show the 100- to 200-ms time range during which the response was expected to occur.