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The general experimental approach was a 2 x 2 manipulation of cue congruency (did the written and spoken words match or mismatch?) and sensory detail (high vs. low; 15 vs. 3 vocoder channels). Colored brain regions represent significant regions in our univariate contrasts, cluster thresholded at FDR p < 0.05. The red left IFG cluster and blue anterior STG cluster were defined by the match > mismatch contrast. The green cluster extending along the whole of STG and posterior middle temporal gyrus was defined by 15 > 3 channel vocoder speech. The yellow PrG and turquoise IPS clusters were defined by the sensory detail x congruency interaction, which was a crossover interaction such that activity was greater for match 3 and mismatch 15 conditions than for match 15 and mismatch 3. All colored regions were implicated in the overall contrast of written + spoken trials against written-only trials. Connectivity arrows are influenced by studies in nonhuman primates19and our physio-physiological interaction analysis.

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