“…Thus, observing errors made by others also elicits a negative ERP, the observer ERN (oERN), whose topography and sources resemble the ERN but with delayed latencies (Bates, Patel, & Liddle, 2005;Carp, Halenar, Quandt, Sklar, & Compton, 2009;Koban, Pourtois, Vocat, & Vuilleumier, 2010;Miltner, Brauer, Hecht, Trippe, & Coles, 2004;van Schie, Mars, Coles, & Bekkering, 2004). Likewise, an observer FRN (oFRN) can be measured during the same time-window as the classical FRN (around 200-300 ms), but with smaller amplitudes for observers than agents of actions (Fukushima & Hiraki, 2009;Leng & Zhou, 2010;Yu & Zhou, 2006), possibly reflecting a decreased saliency of other-generated errors relative to one's own (Bellebaum, Kobza, Thiele, & Daum, 2010). Unlike the oERN (to the best of our knowledge), the neural sources of the oFRN have not been investigated yet.…”