What is sensory processing? How is it related to development?

Sensory processing is how the brain organizes and uses information like sound, light, touch, and body movement. When this is too sensitive or too dull, it can show up in ways that look like "behavior problems," such as picky eating, disliking sounds, or restlessness. The starting point is to understand it as a sensory trait, not as willfulness or a result of parenting.