Dear Editor,rnIn dynamic environments,the memory system of the brain must be able to perceive and process conflicting experi-ences to reach an adaptive decision.In Drosophila,in contrast to consistent experiences,conflicting experiences trigger significantly increased Racl activity which medi-ates active forgetting[1].The ability to cope with conflicting experiences but not simple learning experiences is impaired in mutants of multiple autism-risk genes[2].