Mice: the relationship between calcium activity and acetylcholine is higher anterior for facial movements and posteriorly for locomotion(reproduced with permission from Springer Nature). Flies: modulatory increase in dopaminergic and octopaminergic neurons during spontaneous walking, and a decrease in serotonergic neurons(published under a CC-BY license). Zebrafish: in red, the exploitation-state coding neurons and the principal component trajectory related to the whole-brain exploitation(reproduced with permission from Springer Nature).