  Other influential examples of dynamical explanations of cognition have focused on the coordination of infants’ legs for stepping behavior (Thelen and Smith 1993), perseverative reaching behavior in infants (Thelen et al. 2001), and categorization in a simulated agent (Beer 2003). Authors of these studies have been explicit in their belief that traditional cognitive science should be replaced with the commitments of dynamical cognitive science. Among these commitments is a rejection of representation as a necessary component of cognition as well as a view of cognition as “unfolding” from the continuous interactions between an organism’s brain, body, and environment rather than as emerging from discrete, rule-guided, algorithmic steps. This latter commitment returns us to the theme of embodiment. As Thelen et al. explain: