[1] Korea Adv Inst Sci & Technol, Dept Elect Engn, Yusong Gu, Taejon 305701, South Korea
[2] Korea Adv Inst Sci & Technol, Brain Sci Res Ctr, Yusong Gu, Taejon 305701, South Korea
[3] Salk Inst, Computat Neurobiol Lab, La Jolla, CA 92037 USA
[4] Univ Calif San Diego, Inst Neural Computat, San Diego, CA 92103 USA