Researcher(s) | Participants | Academic Domains | Decline in Intrinsic Motivation |
| Mean age = 84.5 months, Canada | Reading Mathematics | At a different time |
| Grades 3 - 8 Portland, Oregon | Reading Mathematics | Increasing age |
| Ages 9 - 17 The United States and even abroad | Reading Math Science School in general | From elementary school to high school |
| Grades 4 - 11, Chinese students in Hong Kong | Not mentioned | Through grades |
| Grades 3 - 8, San Francisco Bay Area of California | Math Reading | Across the grade levels |
| Grade 3, Elementary school, Germany | School in general Mathematics German | From elementary school age to adolescence |
| Grade 11, Elementary school, Germany | School in general Mathematics German | Throughout elementary school and beyond |