Thus, spectral measures demonstrated a processing hierarchy that was not visible in ERP measures. Event Related Spectral Power in the fusiform g to faces. Responses are averaged across 16 subjects recognizing repeated words or faces. During this prefrontal synchronization, the temporal EEG is strongly desynchronized. Focally-increased spectral power in the human fusiform gyrus selective for faces.
Coherence is a measure of the similarity in field-potential waveforms in different areas.
Our hypothesis would thus predict that the coherence between the EEG in the fusiform gyrus and that in many other structures will phasically increase at around 200ms. In fact, this is what was observed. High Frequency Coherence and Phase Maps. Face stimuli elicit a sharp and transient increase in coherence centered at 200 ms. Words fail to produce a similar change in coherence.