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A, Tactile. B. Auditory
CVisual
hts-5it^ ^v
D. IndividualTac ∩ Aud ∩ Vis
Figure 3. Brain areas responding to auditory, visual and tactile stimulation in Experiment 2. A.
Lateral view of a single subject's partially inflated right hemisphere. Colored regions responded
Significantly to tactile stimulation. Active regions in posterior STS are colored yellow, other active
regions are colored purple. The fundus of the STS is shown as a white dashed line. B. Single subject
activation to auditory stimulation. C. Single subject activation to visual stimulation. D. Single subject
conjunction map showing voxels responding to all three modalities. Circled yellow cluster shows the
STS multisensory area, STSms. E. Mixed effects group map (n=8). Voxels showing a significant
response to all three modalities. Yellow cluster shows the STSms, with center-of-mass (-44, 35,13)
in left hemisphere and (56,41,14) in right hemisphere.
The event-related design used for the tactile experiment allowed us to extract
the average hemodynamic responses to single stimulation trials (Fig. 4A). The strongest
response was to contralateral hand stimulation (0.25%), which was significantly greater
than the response to ipsilateral hand stimulation (0.18%, paired t-test with 7 degrees of