But how can one person actually feel another person’s a? More plausibly, we might think that the causal chain involves a proliferation of effects from the same a — not different subjects having the same feelings about a, but the same a producing different feelings in different subjects. But then we also have a different source of pathos — how can I tell if my a is the same as your a? Not how can I feel another person’s a, but how can I know another person’s a?
