Congenital amusia

TLDR

Congenital amusia, or tone‑deafness, has been known for over a century yet has received limited empirical study. This study aims to detail the behavioural manifestations of congenital amusia. Eleven adults meeting strict musical disability criteria were assessed with tests originally designed for brain‑injury patients to evaluate musical disorders. Results reveal that congenital amusia causes severe pitch‑processing deficits, impaired music memory, recognition, singing, and rhythmic tapping, while leaving speech and other auditory domains intact, confirming it as a distinct learning disability.

Abstract

The condition of congenital amusia, commonly known as tone‐deafness, has been described for more than a century, but has received little empirical attention. In the present study, a research effort has been made to document in detail the behavioural manifestations of congenital amusia. A group of 11 adults, fitting stringent criteria of musical disabilities, were examined in a series of tests originally designed to assess the presence and specificity of musical disorders in brain‐damaged patients. The results show that congenital amusia is related to severe deficiencies in processing pitch variations. The deficit extends to impairments in music memory and recognition as well as in singing and the ability to tap in time to music. Interestingly, the disorder appears specific to the musical domain. Congenital amusical individuals process and recognize speech, including speech prosody, common environmental sounds and human voices, as well as control subjects. Thus, the present study convincingly demonstrates the existence of congenital amusia as a new class of learning disabilities that affect musical abilities.