The model can't guess your thoughts unless it is trained with your brain activity (fMRI, EEG). After training, you feed it more brain imaging and see what comes

The model can't guess your thoughts unless it is trained with your brain activity (fMRI, EEG). After training, you feed it more brain imaging and see what comes out. I don't know if this could be applied to, say a prisoner in Guantanamo, strapped to a fMRI and forced to look at images while the model trains on his brain activity. The subjects in these experiments are cooperative, while a uncooperative subject could try to blur his sight, meditate, think of loud songs, a movie, food, etc., to dissociate their vision from their thoughts.