 Consider an organism S that (a) causally interacts with three different natural kinds, K1-K3, in its environment and (b) has a language of thought with five terms “X1”-“X5”. Further, suppose that each time S interacts with an individual of kind Ki this causes an occurrence of one or more of “X1”-“X5”. We can then create a kind of “spreadsheet biography” or “log of mental activity” for S in which there is a column for each of “X1”-“X5” and a row for each instance in which a member of K1-K3 causes one or more instances of “X1”-“X5”. Each mental representation “Xi” that Ki triggers receives a “1” in its column. Thus, a single spreadsheet biography might look like that shown in Figure 1.