title: Active symbols, limited storage and the power of natural intelligence.
authors.affiliation: Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, Electronic mail: echown@caen.engin.umich.edu.
authors.forename: E
authors.initials: E
authors.lastname: Chown
authors.affiliation: Department of Psychology, University of Michigan, Ann Arbor, MI 48109, Electronic mail: stephen_kaplan@ub.cc.umich.edu.
authors.forename: S
authors.initials: S
authors.lastname: Kaplan