Parents can provide information on the child's narrow interests and unusual attachment to objects. Often sensory input that incorporates a visual, auditory, tactile, olfactory, or motor component is either excessively sought or strongly avoided. An example of a visual interest is a child who enjoys spinning objects, twirling, and watching fans or objects that rotate. The stereotypic behaviors of these children include jumping up and down and hand flapping when excited, flipping fingers in front of their eyes, and rocking their body.