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Mean proportion of idea units recalled during the final free recall test, as a function of learning conditions (SSSS, SSST, or STTT) and learning intervals (5-min or 1-week). S denotes study; T denotes test. Error bars represent standard errors. *Denotes difference is significant at p < 0.05, **denotes difference is significant at p < 0.01, #denotes difference is marginally significant at p = 0.07.
