title: Gollin's (1965) levels-by-levels approach: the importance of manipulating the task dimension when assessing age-related changes and individual differences in decision making.
authors.affiliation: Department of Psychology, University of Queensland Brisbane, QLD, Australia.
authors.forename: Kana
authors.initials: K
authors.lastname: Imuta
authors.affiliation: Department of Psychology, University of Otago Dunedin, New Zealand.
authors.forename: Josh
authors.initials: J
authors.lastname: Hewitt
authors.affiliation: Department of Psychology, University of Otago Dunedin, New Zealand.
authors.forename: Damian
authors.initials: D
authors.lastname: Scarf
keywords: behavioral economics; child development; cognitive development; contextual variables; decision making; delay of gratification; levels by levels approach