Symptoms of input learning disabilities may include the inability to understand spoken words, delayed language acquisition, or difficulty recognizing numbers, letters, and math symbols. Affected children may have trouble reading, writing, and learning the alphabet. Skills that require eye-hand coordination, such as catching a ball, may be challenging for children with input learning disabilities as well. Social problems, such as difficulty with impulse control, seeming to "never pay attention, " aggression, or excessive anxiety may also be symptoms of an input learning disability. When the input learning disabilities are severe, symptoms may become apparent when the child is very young, but milder disability may only present itself when the child is faced with the challenges of the school environment for the first time.