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Misophonia

Disorder of decreased tolerance to specific sounds

  • 24 min read
  • 8 chapters

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Through Sampling (statistics), Mental disorder and Anxiety

When confronted with specific "trigger" stimuli, people with misophonia experience a range of negative emotions, most notably anger, extreme irritation, disgust, anxiety, and sometimes rage. The emotional response is often accompanied by a range of physical symptoms (e.g., muscle tension, increased heart rate, and sweating) that may reflect activation of the fight-or-flight response. Unlike the discomfort seen in hyperacusis, misophonic reactions do not seem to be elicited by the sound's loudness but rather by the trigger's specific pattern or meaning to the hearer. Many people with misophonia cannot trigger themselves with self-produced sounds, or if such sounds do cause a misophonic reaction, it is substantially weaker than if another person produced the sound.

Misophonic reactions can be triggered by various auditory, visual, and audiovisual stimuli, most commonly mouth, nose, and throat sounds (particularly those produced by eating and drinking), repetitive sounds produced by other people or objects, and sounds produced by animals. The term misokinesia has been proposed to refer specifically to misophonic reactions to visual stimuli, often repetitive movements made by others. Once a trigger stimulus is detected, people with misophonia may have difficulty distracting themselves from the stimulus and may experience suffering, distress, or impairment in social, occupational, or academic functioning. Many people with misophonia are aware that their reactions to misophonic triggers are disproportionate to the circumstances, and their inability to regulate their responses to triggers can lead to shame, guilt, isolation, and self-hatred, as well as worsening hypervigilance about triggers, anxiety, and depression. Studies have shown that misophonia can cause problems in school, work, social life, and family. In the United States, misophonia is not considered one of the 13 disabilities recognized under the Individuals with Disabilities Education Act (IDEA) as eligible for an individualized education plan, but children with misophonia can be granted school-based disability accommodations under a 504 plan.

The expression of misophonia symptoms varies, as does their severity, which can range from mild and sub-clinical to severe and highly disabling. The reported prevalence of clinically significant misophonia varies widely across studies due to the varied populations studied and methods used to determine whether a person meets diagnostic criteria for the condition. But three studies that used probability-based sampling methods estimated that 4.6–12.8% of adults may have misophonia that rises to the level of clinical significance. Misophonia symptoms are typically first observed in childhood or early adolescence, though the onset of the condition can be at any age. Treatment primarily consists of specialized cognitive behavioral therapy, with limited evidence to support any one therapy modality or protocol over another and some studies demonstrating partial or full remission of symptoms with this or other treatment, such as psychotropic medication.

Terminology

Pawel Jastreboff and Margaret M. Jastreboff coined the term misophonia in 2001 with the assistance of classical scholar Guy Lee, introducing it in their article "Hyperacusis", with further explanation in the International Tinnitus and Hyperacusis Society's ITHS Newsletter.

Misophonia comes from the Ancient Greek words μῖσος (IPA: ), meaning "hate", and φωνή (IPA: ), meaning "voice" or "sound", loosely translating to "hate of sound", and was coined to differentiate the condition from other forms of decreased sound tolerance, such as hyperacusis (hypersensitivity to certain frequencies and volume ranges) and phonophobia (fear of sounds).

The term misophonia was first used in a peer-reviewed journal in 2002. Before that, the disorder was more commonly called selective sound sensitivity syndrome or 4S, a term coined by audiologist Marsha Johnson. Other names formerly used for the condition include soft sound sensitivity symptom, select sound sensitivity syndrome, decreased sound tolerance, and sound-rage.

Even after the term misophonia was coined, the condition remained largely undescribed in the clinical and research literature until 2013, when a group of psychiatrists at Amsterdam University Medical Center published a detailed misophonia case series and proposed the condition as a "new psychiatric disorder" with defined diagnostic criteria. In this series, Schröder and colleagues coined the term misokinesia (a term analogous to misophonia translating to "hatred of movement") to describe misophonia-like reactions that occur when people are "triggered" by specific repetitive visual stimuli, such as another person's foot shaking, fingers tapping, or gum chewing. Other authors have proposed Conditioned Aversive Response Disorder (CARD) as a more suitable name, which seeks to incorporate both the respective auditory and non-auditory aspects of misophonia and misokinesia into a single condition.

Adopting DSM-5-like terminology, some research groups have also advocated the name misophonic disorder to distinguish clinically significant and disabling misophonia from what they term misophonic reactions (i.e., sub-clinical manifestations of misophonia that do not cause marked distress or substantially impair a person's daily life, relationships, or activities).

Notably, of the above terms, only misophonia is widely used by researchers, clinicians, and sufferers of the condition. It is the primary term used for the condition in mainstream journalistic coverage and by the primary philanthropic agency funding research into it, The Misophonia Research Fund (MRF), and the term selected for use in an (MRF-funded) project to derive a field-wide consensus definition of the condition for clinical and research use.

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