Pre-exposure to categorical stimuli can facilitate, retard, or have no effect, on subsequent free classification, depending on category structure; it also affects the number of categories formed. Supports McLaren-Kaye-Mackintosh model, and develops a methodology for studying free classificaiton. It also provides a demonstration that free classification is not an adequate model of perceptual learning (compare Saksida, 1999).

Wills, A.J., & McLaren, I.P.L. (1998). Perceptual learning and free classification. Quarterly Journal of Experimental Psychology, 51B, 235-270.

Issue published: 1 August 1998.