(a) Mobs are mice that observe social rules (high rule-observance responses, in green). When both mice cooperate, they quickly learn that if they respect each other, they get more pleasure reward time in total.
(b) When one mouse is respectful and the other is not (Mvio, mice violating the social rule), the latter learns the rule after several experiment sessions. (c) When both mice violate the rule, they also have less incentive to start a new session. Pre-emptive occupation (red columns), which is the quick occupation of the other's mouse section of the box, goes against 'social rules' and requires a lot of energy. Interestingly, even the most respectful mice pairs are still tempted to move to the reward zone (disruption as indicated in yellow is still present in all experiments, even at the 20th session), but other experiments showed that Mobs invade the other's space at the end of the session, not at the beginning (pre-emptive occupation, red).