“…Investigations have been directed at concept formation (Vonk, 2002(Vonk, , 2003Vonk & MacDonald, 2002), food processing (Byrne & Byrne, 1993;Pika & Tomasello, 2001), learning (Fischer, 1962;Fischer & Kitchener, 1965;Patterson & Tzeng, 1979;Rumbaugh & Steinmetz, 1971;Yerkes, 1927), linguistic skills (Patterson, 1978), mirror self-recognition (InoueNakamura, 1997; Ledbetter & Basen, 1982;Shillito, Gallup, & Beck, 1999;Suarez & Gallup, 1981;Swartz & Evans, 1994), problem-solving (Robbins, Compton, & Howard, 1978), social cognition (e.g., Maestripieri, Ross, & Megna, 2002;Mitchell, 1991;Stoinski, Wrate, Ure, & Whiten, 2001), and tool use (Fontaine, Moisson, & Wickings, 1995;Nakamichi, 1999). Our focus will be only on issues of memory, especially those relevant to the understanding of episodic memory and mental time travel.…”