Children with sensory processing disorder have problems processing information from the senses. This makes it hard for them to respond to that information in the right way. The senses include touch, movement, smell, taste, vision, and hearing. They might have an unusually high or low pain threshold. Some children also seek sensory input in unsafe ways, such as putting inedible objects like rocks or paint into their mouths. In most cases, these children have one or more senses that either react too much or too little to stimulation.