Background: The Agency is capable of changing the own perceptual inputs at will (Russell, 1996;) 2000).The hypothesis of this work is that - according to Russell-, this would be altered in subjects with autism and that, on the other hand, it strengthens in critical periods of development (3 and 4 years old). Method: Assessed skills associated with the agency: monitoring of action, recognition of the Agency, instigation, the ability to correct errors on the fly and central inhibition, in children typical development of different ages, and children with and without autism using unpublished tests. Results: The differences due to age are found in the tests that evaluate the monitoring of an action plan, the recognition of the agency, the central inhibition and instigation, as well as the amount of mistakes made and the ability to correct them on the march. The differ...