 Holist individuation is very fine-grained: the slightest difference in total functional role entails that different types are tokened. Since different thinkers will always differ somewhat in their mental computations, it now looks like two thinkers will never share the same mental language. This consequence is worrisome, for two reasons emphasized by Aydede (1998). First, it violates the plausible publicity constraint that propositional attitudes are in principle shareable. Second, it apparently precludes interpersonal psychological explanations that cite Mentalese expressions. Schneider (2011: 111–158) addresses both concerns, arguing that they are misdirected.