What pattern of development refers to development that starts at the core and moves outward to the extremities? ?

It is called as proximodistal patterns.  The development starts at the center of the body and goes out to the extremities.  The proximodistal pattern could be observed in physical and mental changes of a person. Examples are brain development, motor skills, and bodily nutrition.

Anxiety disorders, attention deficit hyperactivity disorder (adhd, add), and autism spectrum disorder (asd). (source: )

Ibelieve this would be an obstacle.