I have a repetition suppression / enhancement study. Alternating video stimuli are presented as follows:

A B A B

I compare the first and last presentations to measure the suppression or enhancement effect. Like so:

```
# A B A B
C1 = ' 1 0 0 -1'
C2 = '-1 0 0 1'
```

So the T-image of C1 shows suppression effects, and the T-image of C2 shows enhancement effects.

Now what I would like to do is see where these two T-images differ.

One way I could do this is to binarize the thresholded images, then do a boolean exclusive-or of the two. Voxels that are different between the two will be true, and voxels that are equal will be false.

Is this an appropriate way to do this?

Is there a better way?

Thanks