a1 Department of Psychology, Emory University, Atlanta, GA 30322; email@example.com http://www.psychology.emory.edu/cognition/lourenco/index.html
a2 Department of Psychology, University of Chicago, Chicago, IL 60637. firstname.lastname@example.org http://psychology.uchicago.edu/people/faculty/slevine.shtml
The proposal of Rips et al. is motivated by discontinuity and input claims. The discontinuity claim is that no continuity exists between early (nonverbal) numerical representations and natural number. The input claim is that particular experiences (e.g., cardinality-related talk and object-based activities) do not aid in natural number construction. We discuss reasons to doubt both claims in their strongest forms.