Before revision: Demonstrating episodic memory in the absence of language, and thus in non-human animals, has been declared impossible because there are no agreed-upon non-linguistic behavioral indicators of conscious experience (Griffiths et al., 1999).
After revision: Demonstrating episodic memory in the absence of language, and thus in non-human animals, has been declared impossible as long as there are no agreed-upon non-linguistic behavioral indicators of conscious experience (Griffiths et al., 1999).