○Daigo Takeuchi¹, Yuma Kajihara², Takashi Kawai³, Kenji Doya², Susumu Tonegawa^3,4,5 (1. Grad Sch Med, Univ of Tokyo, Tokyo, Japan, 2. Neural Computation Unit, OIST, Okinawa, Japan, 3. MIT, Massachusettes, USA, 4. Howard Hughes Medical Institute, USA, 5. RIKEN Center for Brain Science, Wako, Japan)