There are between 4,000 and 6,000 languages remaining in the world and the
characteristics of these languages vary widely. How could an infant born today master any …

We investigated the understanding of causal systems categories—categories defined by
common causal structure rather than by common domain content—among college students …

People often think of categories in terms of their most representative examples (eg, robin for
BIRD). Thus, determining which exemplars are most representative is a fundamental …

We investigated the effect of co-presenting training items during supervised classification
learning of novel relational categories. Strong evidence exists that comparison induces a …

Most theories of categorization posit feature-based representations. Markman and Stilwell
(2001) argued that many natural categories name roles in relational systems and therefore …

Learning categories defined by the relations among objects supports the transfer of
knowledge from initial learning contexts to novel contexts that share few surface similarities …

Some research suggests typicality is stable, other research suggests it is malleable, and
some suggests it is unstable. The two ends of this continuum—stability and instability—make …

We do not simply have concepts; we use concepts. And, the way in which we use concepts
can dynamically change the relations among them. One way to shed light on this dynamic …

Across three experiments, we explore differences between relational categories—whose
members share common relational patterns—and entity categories, whose members share …

Knowing which features are frequent among a biological kind (eg, that most zebras have
stripes) shapes people's representations of what category members are like (eg, that typical …