title: Qualitative and quantitative considerations in encoding difficulty effects.
authors.forename: M A
authors.initials: MA
authors.lastname: McDaniel
authors.forename: G O
authors.initials: GO
authors.lastname: Einstein
authors.forename: T
authors.initials: T
authors.lastname: Lollis
mesh_terms: D000339:Affect; D006801:Humans; D007858:Learning; D008568:Memory; D008960:Models, Psychological; D005082:Physical Exertion; D012660:Semantics