Absolute difference between the state transition probability <i>P</i> of <i>G</i>_{<i>smallbrain</i>} and <i>G</i>_{<i>no-feedback</i>} (<i>P(G</i>_{<i>smallbrain</i>}<i>)–P(G</i>_{<i>no-feedback</i>}<i>)</i>).

The first digit (S) describes whether anything (wall or other animat) is sensed (1) or not sensed (0) and the second digit (M) describes whether the animat moved/turned (1) or did not move/turn (0). Most notably, animats in Gsmallbrain switched more often between sensing and moving than animats in Gnofeedback (“01→10”, “10→01”, but “11→11”).