 In the case of theory of mind, on the other hand, we don’t yet have developed theories about the relevant structures (but see the related work on causality collected in Gopnik &amp; Schulz 2007). So it is only if Bayesians can get a handle on these representational and statistical problems, that they will be able to attack our question: how is the space of such structures generated in the first place? Is there innate domain-specific information at work or is there a Bayesian hierarchy, a two-level-up Bayesian account that explains how this one-level-up information is acquired (that is, a Bayesian learning-theoretic account that explains why the child represents linguistic input, for example, using tree structures, but integers in terms of a very different linear structure; for further discussion see Tenenbaum et al. 2011).