“…A simplified FEL architecture without the internal forward model has been extensively studied for robot control (Kawato et al, 1988;Tolu et al, 2012;Gomi et al, 1993;Hamavand et al, 1995;Talebi et al, 1998;Topalov et al, 1998;Teshnehlab et al, 1996;Kalanovic et al, 2000;Kurosawa et al, 2005;Neto et al, 2010;Jo et al, 2011). However, stability guarantee relies on a precondition that the controlled plant can be stabilized by linear feedback without feedforward control in Tolu et al (2012); Kawato et al (1988); Teshnehlab et al (1996); Kalanovic et (2000); Kurosawa et al (2005); Neto et al (2010); Jo et al (2011), which may not be satisfied for many control problems such as robot tracking control; in Gomi et al (1993); Hamavand et al (1995); Talebi et al (1998); Topalov et al (1998), internal inverse models are implemented in the feedback loops, which violates the original motivation of proposing FEL.…”