I had never heard of this disorder before:
In hyperlexia, a child spontaneously and precociously masters single-word reading. It can be viewed as a superability, that is, word recognition ability far above expected levels… Hyperlexic children are often fascinated by letters and numbers. They are extremely good at decoding language and thus often become very early readers. Some hyperlexic children learn to spell long words (such as elephant) before they are two and learn to read whole sentences before they turn three. An fMRI study of a single child showed that hyperlexia may be the neurological opposite of dyslexia.
Often, hyperlexic children will have a precocious ability to read but will learn to speak only by rote and heavy repetition, and may also have difficulty learning the rules of language from examples or from trial and error, which may result in social problems… Their language may develop using echolalia, often repeating words and sentences. Often, the child has a large vocabulary and can identify many objects and pictures, but cannot put their language skills to good use. Spontaneous language is lacking and their pragmatic speech is delayed. Hyperlexic children often struggle with Who? What? Where? Why? and How? questions… Social skills often lag tremendously. Hyperlexic children often have far less interest in playing with other children than do their peers.
The thing is, this absolutely and precisely describes me in childhood, especially before the age of 5 or 6. (This is also the typical age when hyperlexic children begin to learn how to interact with others.) It also describes my son – which is how my wife found the description and forwarded it to me.
You walk around your entire life with these stories, these tics, and the entire time, your quirks are really symptoms. It’s a little strange.