Passivity normalized to clutch, non-stimulated controls. Optogenetic stimulation suppressed futility-induced passivity following recovery compared with non-stimulated clutch controls and non-expression controls stimulated with blue light. One-way ANOVA with Sidak’s multiple comparison test.n= 19 (dbh:CoChr, no light), 14 (wild type, blue light), 13 (dbh:CoChr, blue).p= 0.0004 (WT-Blue light vs. DBH-Blue light),p= 0.0392 (WT-Blue light vs. DBH-no light),p= 0.0392 (DBH-no light vs. DBH-Blue light).