Ana Teresa Pérez-Leroux is Professor of Spanish and Linguistics, and Director of the Cognitive Science Program at the University of Toronto. Her research seeks to understand how children learn the syntax and semantics of the smallest and silent components of sentence grammar, including determiners, prepositions, number, tense, mood and aspect, null objects and subjects, and how grammatical complexity develops from these components.

1. Missing objects in child language; 2. From the missing to the invisible; 3. Rome leads to all roads; 4. Interpreting the missing object; 5. How unusual is your object?; 6. Conclusion.