text updates

[mobeets]

• [x] see Fig. 4a; explain motivation for IME; refer to methods for how to choose trials
  • "we selected a subset of trials where we saw learning with asymptotic behavior"
• [x] When discussing the two mappings hyps, say as an aside, we also considered empirical versions of MF and BF, and these didn't do as well (see Supp)
• [x] Best mean hypothesis
  • after showing MF and BF results, but before moving on to the two mappings
  • in Results text: "You might be worried about this..."
• [x] SSS motivation