Full Idea
The prototype paradigm of concepts makes the strong prediction that typical members should be easier to categorise than atypical members.
Gist of Idea
The prototype view predicts that typical members are easier to categorise
Source
Edouard Machery (Doing Without Concepts [2009], 6.4.1)
Book Reference
Machery,Edouard: 'Doing Without Concepts' [OUP 2009], p.174
A Reaction
This is why philosophers should approach the topic of concepts with caution. Clearly empirical testing is going to settle this matter, not abstract theorising.