In an fMRI study conducted by Tong et al. (1998), the observers viewed a face-house composite image through red-blue glasses that evoked perceptual bistability. The results of the fMRI measurements of brain activity showed increased FFA activity when the observer:

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The FFA, or fusiform face area, is a region in the human brain known to specialize in facial recognition. In the study by Tong et al. (1998), increased activity in the FFA was observed when participants perceived the face in the composite image, indicating the FFA's role in processing faces over other objects like houses.

In an FMRI Study Conducted by Tong Et Al