When you lose hearing on one side, whether suddenly or after acoustic neuroma surgery, the world does not simply become quieter. It loses direction.
Voices blur, traffic feels unpredictable, and familiar spaces take on a strange, one dimensional quality. This experience has a name: loss of sound localisation.
What Is Sound Localisation
Sound localisation is the brain’s ability to determine where a sound originates. It relies on input from both ears using two main cues.
- Interaural Time Difference (ITD):
A sound reaches one ear microseconds before the other. That tiny delay helps the brain to identify direction. - Interaural Level Difference (ILD):
Sounds are slightly louder in the ear nearer the source. The brain compares loudness to map position.
The outer ears also shape sound, adding clues about height and distance. Together, these signals create a seamless three dimensional soundscape until one ear goes silent.
When One Ear Stops Contributing
With single sided deafness (SSD), the brain loses half of its input. Sound becomes flat and directionless, like hearing through a single loudspeaker.
You can still hear, but you cannot tell where.
Common experiences include:
- Turning the wrong way when someone calls your name
- Hearing a phone ring but not knowing which direction to move
- Feeling unsafe crossing streets because traffic sounds blend together
It is not merely inconvenient; it is mentally tiring. The brain works constantly to interpret a soundscape that has lost its depth.
Can the Brain Adapt to sound localisation with one ear?
The short answer is both yes and no. The brain is remarkably adaptable, but the extent of that adaptation varies between individuals. When hearing is lost on one side, the brain gradually learns to compensate in several ways. Many people become more visually aware, watching for movements. Others rely on environmental cues such as echoes, reflections, or contextual sounds. Over time, the brain also builds a library of learned patterns, helping to recognise familiar sounds through memory rather than direction
Assistive devices such as CROS or BiCROS hearing aids can further support communication by transmitting sound from the deaf side to the hearing ear, reducing the head shadow effect. However, because the brain still interprets all sound as coming from one side, these devices do not restore the ability to locate where sound originates.
For some people, the sense of direction never fully returns. They may always find it difficult to pinpoint where a sound is coming from. Others find that with time, visual and environmental awareness compensates enough for daily communication to feel easier. The reality is that while the brain can adapt impressively, the outcome is highly individual. Some adjust naturally, some with technology, and others simply learn to live comfortably with the difference.
The Emotional Experience
Losing sound direction is not only a technical change; it is also an emotional one.
You grieve the effortless orientation you once had, the instinctive way you responded to voices, music, and movement. The world can feel disorientating and lonely.
However, gradually, confidence returns. You begin noticing the details you once overlooked: body language, rhythm, vibration. You start to see sound instead of simply hearing it.
Each moment of clarity, turning towards a voice correctly, locating a bird call, or navigating a busy street, feels like a small victory.
Living Well with Single Sided Deafness
If you are adjusting to SSD, remember:
- Your frustration is valid. This change is neurological, not emotional weakness.
- It may never improve and that’s ok. Speaking about it and acknowledging it makes others feel less alone.
- Support groups and professionals who understand acoustic neuroma can provide guidance and comfort.
Losing one ear does not mean losing your connection to sound, only learning to interpret it differently.
Direction may feel uncertain at first, but in time, you rediscover balance, confidence, and a new way to listen to the world.
If you prefer audio, you can listen to the podcast version here.
If you prefer visual content, you can watch the YouTube version of this topic here.
Please share your experiences. Our story might help someone else feel a little less alone, and together, we can make sense of this one eared world.
Image credit: Bruce Burby.
Smaller groups of people. One conversation at a time and sitting in the right place so your hearing ear is nearest the people. That way you can do it!
Very useful Tips
Exactly that 😊
As a teacher it is very difficult. Sound location is not there and trying to compensate by constantly scanning room for lip movement or show of hand can be exhausting…and put a person in embarrassing position.
Live music sounds like it on AM radio. Sometimes tinny, not full.
The CROS hearing aids, used in social situations, pick up the one side but still do not assist with direction or fullness.
Been 2 years and I mourn the loss daily
I can definitely relate to that. I am also a teacher
I’m a teacher too and feel exactly the same way. It’s been 5 years for me
Hi Evelyn, I can relate I did training with groups of adults. I decided I was better off sharing my challenge with the participants and asking them to raise a hand and wait to be called on before speaking. I too have Cros hearing aids. It’s been 20 years for me.
I never realised how much it would affect me, I just assumed it would be ok as I still had one ear! After 4 yrs I still can’t identify where sounds are coming from I do morn the loss but the positive is the tumour has gone.
Traffic is a big problem, I always go out with someone. I also have terrible balance which causes falls when I turn my head quickly or whilst walking.
Placement in a group, especially at a table is important. My family and friends allow me to choose my seat first so I can be in the right spot to hopefully hear everyone.
Crowds stink and concerts and very difficult.
Bee SSD for 9 and a half years due to an AN. It’s my new normal. You get used to it after awhile.
It’s been 5 years for me and I’m still struggling with so many life changing symptoms, facial weakness, ssd on the left, balance disturbance, eye drops in my left eye where it gets too dry, anxiety, depression I feel like the symptoms are never ending. Grieving the old me and yet still mourning for all the things that I could do that I can’t now, it’s so frustrating as I’m still having falls and losing balance and recently struggling with migraines.
As a automotive tech I work on cars on a lift. If I drop a bolt or a nut, I’ll look down at the ground quickly to see which direction it went. Test driving cars can be equally challenging trying to locate where a noise is coming from.
I found that tinnitus and localization improved with my CROS device, I have also learned to trust but verify my instincts when localizing a sound. Loud noisy events are still a disaster, discouraged last night when someone asked for help in a crowded sports arena and I could not understand them at all. But then I think of all the problems I don’t have, and the family friends who have succumbed to brain cancer and redouble my efforts to do the best I can in my situation.
A really good read and one I identify with, everything is more tiring when you have SSD linked to an Acoustic Neuroma. I work in a University and it’s so challenging when delivering group sessions, feels like I need to work twice as hard as everyone else!
I have found that I use my eyes more to look for where sounds are coming from and it wears my vision out more throughout the day. Just another adjustment.
This is so well articulated and explained. Thank you, from one AN SSD pal to another. It is even more challenging when your vision is skewed with oscillopsia and dizziness after facial paralysis and other lovely AN brain tumor side effects, but I keep getting stronger every day. It’s been an arduous 20 months, but I am happy to be alive. I’m acclimating more everyday. 🤩
We have been living in Canada since 2008. It has been a long and challenging journey for her. In 2006, my wife was diagnosed with a schwannoma and underwent surgery in Hyderabad, India, which resulted in the loss of hearing in her left ear. A similar issue was identified in her right ear in 2017–2018, for which she completed 30 sessions of Stereotactic Gamma Knife radiation.
She currently uses a Signia CROS hearing device for her right ear and has about 60–70% hearing ability. Her oncologist continues to monitor her condition annually with an MRI of the head with contrast.
We live in the suburbs, where noise pollution is minimal except when near the main road.
She is using this device whenever we go out for shopping/dinner/appointments/travel. All family members are aware of the hearing challenges and limitations of her interactions with others in group. Mostly one-on-one and I always make sure I am there for her.
At home TV we use soundbar for improvisation of sound while watching TV.
Waiting for further advancement in this area in improving hearing ability and confidence to lead a normal life…
Hi Amir
Great to find this! My operation was in May 2024, I am enjoying the journey of “re-training”, I love the way our brain adapts.
Would love to share experiences, do you hold workshops?
Kind regards
Stephen
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