1. Basic level categorization in seven- and nine-month-old infants
2. Mitchell D. , Colombo J. , Horowitz F. & O'Brien M. (1986) Two kinds of memory in infants: effects of type of test-phase on infants' discrimination performance. Unpublished manuscript, University of Kansas Infant Study Center.
3. Colombo J. , Mitchell D. & Horowitz F. (1986) Infant visual behavior in the pairedcomparison paradigm: psychometric properties and acquisition-performance relationships. Unpublished manuscript, University of Kansas Infant Study Center.
4. Colombo J. , Mitchell D. W. , O'Brien M. & Horowitz F. (forthcoming) Stability and reliability of infant visual habituation during the first year. Child Development.