Failure, instead of inhibition, should be monitored for the distinction of self/other and actual/possible actions

I suggest that layer 4 of the shared circuits model (SCM) should monitor the failure of performing an action, instead of output inhibition, to obtain actual/possible and self/other distinctions. The target article's assumption of selective inhibition leaves some questions unanswered, such as the criteria for the selection. Monitoring failure can answer these questions because failure does not require selection. It also provides a basis for more likely explanation for the phylogenetic and ontogenetic origin of both monitoring and output inhibition.