We were not surprised that SA patterning occurred at a 90-s ITI which was not inferior to SA patterning obtained at a 30-s ITI (see Capaldi et al., 2007). This is because in an instrumental runway situation, Capaldi and Lynch (1966) had obtained SA patterning at a 24-h ITI, a finding replicated by Jobe, Mellgren, Feinberg, Littlejohn, and Rigby (1977).