Learning to reach with "sticky" or "non-sticky" mittens: a tale of developmental trajectories

The effects of "sticky" and "non-sticky" mittens upon the progression of intentional reaching were examined over 16-day training in 24 non-reaching infants aged 2 months and 21 days. Thirteen age-matched controls did not receive training. Both mittens groups progressed over time; however, by day 16, only the "non-sticky" group made significantly more toy contacts than the controls when looking at the toy. Infants in the "non-sticky" group also directed their looking at the toy more than infants in the "sticky" mittens group. These results support the interpretation that repeated task exposure, with active, reaching-specific experience, was more likely to enhance the formation of object-directed behaviors than with the added provision of grasping simulation via "sticky mittens."