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Special Collection

Theoretical review with commentaries: Qualitative individual differences

Collection launched: 27 Aug 2021

Assumptions about whether individuals are more-or-less the same in some respect or fundamentally different is vital for theory-building in cognition. But can we tell whether the assumptions we make about individual variability are merited?

This special collection features a theoretical review by Rouder and Haaf contrasting quantitative individual differences, in which people vary in the degree to which they show an effect but not the direction of the effect, with qualitative individual differences, where people reliably differ in the direction of the effect itself. Rouder and Haaf discuss methods for determining whether individual differences are quantitative or qualitative and consider the potential theoretical impact of distinguishing these kinds of variability.

The special collection includes commentaries from experts on individual differences in a variety of domains of cognitive science.