“…Thus, as memory weakened with longer retention intervals, a greater proportion of forced tests, but not chosen tests, would be based on poor memory. The findings were clearly in line with the theoretical idea that monkeys chose to take the memory test when they felt certain of the awareness (Heyes, 1994(Heyes, , 1995, theory of mind (Povinelli, 2000), mental time travel (Suddendorf & Corballis, 2007;Zentall, Singer, & Stagner, 2008) and metacognition (Crystal & Foote, 2009, 2011Jozefowiez, Staddon, & Cerutti, 2009). …”