All children in the study had a similar level of language development
They gathered up forty five children on the autism spectrum and thirty two neurotypical preschool children. All had a similar level of language development. Because autism often slows down this development, that meant that the neurotypical children were, on average, three years old, while the children on the spectrum were typically five years old.
The children were set up with technology to track their eye movement, then they were set to watch a screen with two videos on it, playing at the same time.