6 months:
understanding others’ action intention
9-12 months
joint attention and imitation
1 year old:
basic understanding others’ desires*
1.5 -2 years old:
explicit sense of self indicated by passing Rouge test
2 years old:
greater understanding that others’ desires can be different from one’s own
3 years old:
sensitive to whether someone is knowledgeable in a topic or not + basic understanding that beliefs lead to action but fail at false-belief tests
5 years old
more fully developed theory of mind and pass false-belief test
Children that are better able to understand goal-directed action at 6 months
show better performance on false belief tasks at 4 year