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2011- In press

Ferry, A. Hespos, S.J., Gentner, D.(2015) Prelinguistic relational concepts: Investigating the origins of anaolgy in infants. Manuscript in press at Child Development. pdf

Rips, L.J., & Hespos, S.J. (2015). Divisions of the physical world: Concepts of objects and substances. Manuscript in press at Psychological Bulletin. pdf

Chang, Y-J. & Wang, S-W. (2014). BLT: Experimental program for online coding babies' looking time. Evanston, IL., USA. application , pdf

Ferry, A., Hespos, S.J., Waxman, S. (2013). Non-human primate vocalizations support categorization in very young human infants. Proceedings of the National Academy of Science, 110(38), 15231 – 15235. pdf

French, J.A., Tumuluru, S., Walco, D.K., Hespos, S.J., Uttal, D.H., Rosengren, K.S. (2012). Do 12-month-olds grasp the nature of photographs? Manuscript under review. pdf

Hespos, S.J., Dora, B., Rips, L., & Christie, S. (2012) Infants make quantity discriminations for substances. ChildDevelopment, 83 (2), 554-567. pdf

Hespos, S.J., & vanMarle, S. J. (2012) Physics for infants: Characterizing the origins of knowledge about objects, substances, and number. Wiley Interdisciplinary Reviews: Cognitive Science, 3 (1), 19-27. pdf

Hespos, S.J., Grossman, S., Saylor, M.M. (2011) Infants' ability to parse continuous action series: further evidence. Neural Networks, 23, 1026-1032. pdf

Rips, L. & Hespos, S. J. (2011) Rebooting the bootstrap argument: Two puzzles for bootstrap theories of concept development. Behavioral Brain Sciences, 34(3), 145-146. pdf



Ferry, A., Hespos, S.J., & Waxman, S. (2010). Language facilitates category formation in 3-month-old infants. Child Development, 81 (2), 472-479. pdf

Hespos, S. J. (2010) What is optical imaging? Journal of Cognition and Development,11 (1), 3-15. pdf

Hespos, S.J., Ferry, A., Rips, L. (2009). Five-month-old infants have different expectations for solids and substances. Psychological Science, 20, (5), 603-611. pdf

Hespos, S. J., & Piccin, T. (2009). To generalize or not to generalize: Spatial categories are influenced by physical attributes and language. Developmental Science, 12 (1), 88 - 95. pdf

Hespos, S. J., Saylor, M., & Grossman, S. (2009). Infants’ ability to parse continuous actions series. Developmental Psychology, 45, (2), 575-585. pdf


Hespos, S.J., Gredebeck, G., von Hofsten, C., & Spelke, E.S. (2009). Occlusion is hard: Comparing predictive reaching for visible and hidden objects in infants and adults.Cognitive Science, 33, 1483-1502. pdf


Hespos, S.J., Ferry, A. L., Cannistraci, C., Gore, J., Park, S. (2009) Optical imaging on human infants. In A.W. Roe (Ed.) Imaging the brain with optical methods (pp. 159-176).

Springer: New York. pdf


Hespos, S. J. & Baillargeon, R. (2008). Young infants’ actions reveal their developing knowledge of support variables: Converging evidence for violation-of-expectation findings.Cognition, 107(1), 304 - 316. pdf


Hespos, S.J. & Spelke, E.S. (2007). Precursors to spatial language: The case of containment. In M. Aurnague, M. Hickman & L. Vieu (Eds.), The categorization of spatial entities in language and cognition (pp. 233 – 245). Amsterdam, Netherlands: Benjamins Publishers. pdf 


Hespos, S. J. (2007). Language Acquisition: When does the learning begin? Current Biology, 17(16), R628 – R630. pdf


Hespos, S. J. & Baillargeon, R. (2006). Decalage in infants' reasoning about occlusion and containment events: Converging evidence from action tasks. Cognition, 99,B31-B41.pdf



Hespos, S. J. & Spelke, E. S. (2004). Conceptual precursors to spatial language. Nature, 430, 453 - 456. pdf

Hespos, S. J. (2004). Language: Life without numbers, Current Biology, 14, R927 - R928. pdf 

Spelke, E.S. & Hespos, S.J. (2002). Conceptual Development in Infancy: The Case of Containment. (pp. 223 – 246) In N. Stein, P. Bauer, & M. Rabinowitch (Eds.), Representation, memory, and development: Essays in honor of Jean Mandler, (pp. 223-246). Hillsdale, NJ: Erlbaum. pdf

Hespos, S. J. & Baillargeon, R. (2001). Infants’ knowledge about occlusion and containment: A surprising discrepancy. Psychological Science, 12(2), 141 – 147. pdf

Hespos, S. J. & Baillargeon, R. (2001). Reasoning about containment events in very young infants. Cognition, 78, 207 – 245. pdf


Spelke, E.S. & Hespos, S.J. (2001). Continuity, competence, and the object concept. In E. Dupoux (Ed.), Language, brain and cognitive development: Essays in honor of Jacques Mehler. Cambridge, MA: MIT Press (pp. 325 – 340). pdf


Rochat, P. & Hespos, S. J. (1997). Differential rooting response by neonates: Evidence for an early sense of self. Early Development and Parenting, 6(3 & 4), 105–112. pdf

Hespos, S. J. & Rochat, P. (1997). Dynamic representation in infancy. Cognition, 64, 153–188. pdf 

Rochat, P. & Hespos, S. J. (1996). Tracking and anticipation of invisible spatial transformations by 4- to 8-month-old infants. Cognitive Development, 11(1), 3–17. pdf

Simon, T., Hespos, S. J., & Rochat, P. (1995). Do infants understand simple arithmetic? A replication of Wynn (1992). Cognitive Development, 10(2), 253–269. pdf


Department of Psychology | Northwestern University | Weinberg College of Arts and Sciences

Infant Lab Phone: (847) 467-0246, Email: