Most people can relate to the experience of certain noises or sensations as being really unpleasant. For example, the thought of nails scratching down a blackboard can make the hairs on your arms to stand up, your teeth feel ‘on edge’ and the strong impulse to quickly cover your ears to stop the noise!
The term “misophonia” (hatred of sound) was first used in the early 2000’s to characterise the experience of an extreme emotional and physical response to certain ordinary, often repetitive, day to day sensory input. It is reported to occur in up to 20% of the population and equally in men and women. The input that evokes the most intense responses tends to be human created orofacial noises like breathing, swallowing, chewing, sniffing, throat clearing and lip smacking. Noises such as tapping and pen clicking have also been reported to be problematic. For people with misophonia, these experiences can evoke intense responses that may not seem in keeping with the circumstance such as disgust, irritation, anxiety, distress, anger and an overwhelming desire to remove themselves or remove the input from their environment.
Rather than misophonia being a hearing problem, it is now proposed to stem from attentional or emotional processing issues later in the brain’s auditory system. In examining brain activity while listening to a variety of sounds (including neutral, unpleasant and known misophonia triggers) Kumar et al (2017) found the following:
· the misophonia group rated the trigger sounds as more distressing than the other sounds.
· the research control group rated trigger and unpleasant sounds as similarly annoying.
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