What Causes Tone Deafness?

By Caileen W.

You may have heard of people being referred to as tone deaf. Maybe it’s in the car, with one of your friends poking fun at your off-key singing. Or maybe it’s in a music ensemble, where one of your group members just can’t seem to match everyone else’s pitch. But what does tone deafness really mean? And what causes it?

To begin, the scientific name for tone deafness is amusia. Specifically, this term refers to the inability to accurately perceive or produce music. Amusia can manifest in various ways, such as the inability to replicate pitches correctly, recognize instrumental music, or produce steady, accurate rhythms. 

But what causes amusia? This disorder is rooted in abnormalities in the brain, and can be divided into two main categories: congenital amusia and acquired amusia [3]. 

Congenital amusia is a neurodevelopmental disorder associated most notably with abnormalities in the brain’s auditory cortex, which is located in the temporal lobe [3]. The auditory cortex is responsible for processing sound and recognizing its location, pitch, and volume [2]. Additionally, the majority of regions in the brain critical to sound processing are in the right hemisphere [3]. Most scientists believe that congenital amusia is caused by a disconnection between different parts of the auditory cortex, which likely causes patients with amusia to be unable to process these different qualities of sound properly [3]. 

On the other hand, acquired amusia is caused by brain damage or injury, such as after a stroke [3]. The location of the damage has important implications for the severity and type of amusia. For example, damage to the left inferior frontal gyrus is associated with less severe amusia which, in most cases, recovered within three months. Conversely, damage to the insular cortex is associated with more long-term damage with little recovery after even six months. Additionally, damage to the right dorsal striatum is most strongly associated with rhythm-type amusia. 

Similarly, specific examples of acquired amusia may reflect patterns usually found in congenital amusia. For example, some cases of acquired amusia have been linked to damage to the corpus callosum and right frontotemporal pathways, which are both used to connect and relay information regarding sound throughout the brain. Therefore, just like congenital amusia, acquired amusia also affects the ability to recognize different qualities of sound by hindering sound processing pathways. 

But can this disorder be treated? Unfortunately, there doesn’t exist a singular widespread treatment. However, musical interventions may be a promising way to help rehabilitate patients with congenital amusia [3]. These interventions include singing or music-making exercises, improvisation activities, or movement classes to music [1]. Additionally, these interventions may provide strong psychological support for patients, who are more likely to suffer from social isolation and stress [3]. 

Therefore, not only is music deeply rooted in neural processes, music is a powerful tool that can be harnessed to treat many neurological disorders. The relationship between the brain and music is fascinating and exists in many different ways, and as musicians, we have the privilege of taking advantage of our brain’s ability to process sound and create beautiful art. 

CITATIONS

1. Clinic C. Music Therapy. Cleveland Clinic. Published May 26, 2017. Accessed June 9, 2026. https://my.clevelandclinic.org/health/treatments/8817-music-therapy

2. ‌Purves D, Augustine GJ, Fitzpatrick D, et al. The Auditory Cortex. Nih.gov. Published 2026. Accessed June 9, 2026. https://www.ncbi.nlm.nih.gov/books/NBK10900/

3. ‌Sihvonen AJ, Teppo Särkämö. Music processing and amusia. Handbook of clinical neurology. 2022;187:55-67. doi:10.1016/b978-0-12-823493-8.00014-6

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