What is the primary characteristic of Landau-Kleffner Syndrome?

Landau-Kleffner Syndrome is primarily characterized by the sudden or gradual loss of language skills, known as acquired aphasia, in a previously healthy child. This condition typically manifests between the ages of 3 and 7 years and is often accompanied by seizures. The aphasia associated with Landau-Kleffner Syndrome may affect the child's ability to understand language and to speak, leading to significant communication difficulties. This distinctive feature sets it apart from other developmental disorders, making it the defining characteristic of the syndrome.

While motor dysfunction, speech delay, and visual disturbances may occur in certain developmental or neurological disorders, they are not primary characteristics of Landau-Kleffner Syndrome, which revolves predominantly around language impairment.