Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.In other words, brightness is the perception elicited by the luminance of a visual target. This is a subjective attribute/property of an object being observed and one of the color appearance parameters of color appearance models.
Answer:
Autism
Explanation:
Description from the passage from your question is telling us that seems that Liam has autism. Sometimes it is hard to recognize it at that age because Liam is only two years old.
The children that have autism don't like to be touched and they don't like to make eye contact with anyone.
Bones breaking is one example