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Adaptive Optics control systems accumulate differential measurements duringclosed loop operations to estimate turbulence and drive the deformable mirror.But have you ever wondered if your control system should be like an elephant,and never forget, or should it have a weak memory like a goldfish? Aremeasurement errors always zero mean or does static effects impact performance?Are commands high spatial frequencies good or are you wasting all theinter-actuator stroke for nothing? This work will try to answer these questionsshowing you results obtained during SOUL commissioning and analysing the impactof the values of the control system poles on Adaptive Optics. So be prepared tofocus on forgetfulness and discover the advantages of being a goldfish in adigital world made of elephants.

Elephants, goldfishes and SOUL: a dissertation on forgetfulness and control systems