Visualization of the method used to form representational similarity matrices in adults. In this case, we use the FFA as an example. A) First, we measured the size of the FFA in every adult and only selected adults with at least 100 voxels. B) Then we determined the average size of the FFA across the selected adults (i.e., 849 voxels). C) Next, we selected the top 849 voxels in every adult such that we had the exact same number of voxels in every participant. D) Once those voxels were selected, we created a similarity matrix in each individual participant, which we then averaged together across participants to make one adult group-level matrix.