A Comparison of Visual Familiarization and Object-Examining Measures of Categorization in 9-Month-Old Infants
Barbara A. Younger and Stephanie D. Furrer
Psychological Sciences, Purdue University

Three studies were conducted to determine whether differential patterns of categorization observed in studies using visual familiarization and object-examining measures hold up as procedural confounds are eliminated. In Experiment 1, we attempted as direct a comparison as possible between visual and object-examining measures of categorization. Consistent with previous reports, 9-month-old infants distinguished a basic-level contrast (dog–horse) in the visual task, but not in the examining task. Experiment 2 was designed to reduce levels of nonexploratory activity in an examining task; 9-month-olds again failed to distinguish categories of dogs and horses. In Experiment 3, we adopted a paired-comparison test format in the object-examining task. Infants did display a novel category preference under paired testing conditions. The results suggest that the different patterns of categorization often seen in looking and touching tasks are a reflection, not of different categorization processes, but of the differential sensitivity of the tasks.