• Normal development until sometime between 1 and 2 when social skills and language begin to regress.
• Difficulty reading social cues and meanings of words, gestures, facial expressions, and emotions.
• A fascination and precocious ability to read numbers and letters at an early age.
• Difficulty initiating and sustaining friendships with others.
• An intense need for structure and routine.
• Difficulty with abstract thought.                
• Sensory integration issues.                       
• Self stimulation behaviors.

For more information on Hyperlexia, and what you can do about it, I strongly recommend visiting the Hyperlexia Organization.

Other related disorders to Hyperlexia include:

• Autism
• Pervasive Developmental Disorder
• Asperger's Disorder