title: Introduction to focus issue: nonlinear dynamics in cognitive and neural systems.
abstract: In this Focus Issue, two interrelated concepts, namely, deterministic chaos and cognitive abilities, are discussed.
authors.affiliation: CNR-Istituto Nazionale di Ottica Applicata, Firenze, Italy. tito.arecchi@inoa.it
authors.forename: F Tito
authors.initials: FT
authors.lastname: Arecchi
authors.forename: Jürgen
authors.initials: J
authors.lastname: Kurths