string: …the previous response, and as such, may be similar to the hippocampal “delay cells” described previously in both rats (Otto and Eichenbaum, 1992b; Hampson et al., 1993) and primates (Watanabe and Niki, 1985; Miyashita, 1988; Miyashita and Chang, 1988; Riches et al., 1991; Colombo and Gross, 1994).