Figure 2 | Scientific Reports

Figure 2

From: Shared neural representations of tactile roughness intensities by somatosensation and touch observation using an associative learning method

Figure 2

Results of the confirmatory analysis. To confirm that brain signals in the fMRI visual runs are mainly related to the associated tactile information and not to low-level visual stimulation, we conducted a confirmatory analysis. Using univariate GLM analyses, we found brain regions consistently activated across five roughness intensity conditions. Two visual (lingual gyrus and calcarine sulcus) and two somatosensory (S2 and SMG) regions were identified. Next, we correlated the activation levels (t-value) with the tactile roughness information (particle size) and the low-level visual information (luminance) for each identified cluster. Significant correlations were found only in the somatosensory regions when correlating t-values with particle sizes. Therefore, these results confirmed that neural signals in the visual runs contain relevant associated tactile information, not low-level visual information.

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