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. Author manuscript; available in PMC: 2007 Jun 5.
Published in final edited form as: Eur J Neurosci. 2004 Oct;20(8):2225–2234. doi: 10.1111/j.1460-9568.2004.03670.x

Figure 6. Comparison of the AV Interactions with the Auditory N1 Wave.

Figure 6

Scalp potential (SP) and current density (SCD) topographies over the left and right hemiscalps, at the latency of the unimodal auditory N1 wave (136 ms). Each row displays: left part, the distributions of the auditory (A), visual (V), bimodal (AV) responses and the sum of auditory and visual (A+V) responses; right part, the distributions of the [AV − (A+V)] interaction pattern with the associated Student’s t-map -estimated on potential values at the same latency (136 ms). The grey colours in t-maps -indicate the scalp areas where [AV − (A+V)] significantly differs from zero. In potential and SCD maps, half the range of the scale (in μV or mA/m3) is given below each map. The topography of the crossmodal interaction pattern is similar to that of the unimodal auditory N1 wave, but with opposite polarities. This interaction could therefore reflect a decrease of the unimodal N1 response in auditory cortex.