It is predicted that the ability of children to complete a certain cognitive test improves as they get older. Two groups of male children were tested; one aged 5 years 0 months to 5 years 6 months, one aged 5 years 6 months to 6 years 0 months. Of the younger group of 25, 10 completed the task. Of the older group of 22, 14 completed the task.