Fig. 6

Topographical maps of the grand-averaged occipital negativity in the middle latencies (260–300 ms) in response to the infrequent stimuli in the cedarwood and resin huts. ERPs to frequent stimuli were subtracted from the ERPs to infrequent stimuli for the topographic mapping. In the topography, blue indicates negativities. Note that the negative component was observed at the occipital region under the cedarwood condition, whereas in the resin condition, the negativity was not obvious at the mid-occipital electrode but was observed at the right occipitotemporal region