Let’s Not Confuse Misophonia and Sensory Processing Disorder – Part 2

Let’s Not Confuse Misophonia and Sensory Processing Disorder – Part 1
August 2, 2016
Personal Story – Developing Misophonia
August 14, 2016

Let’s Not Confuse Misophonia and Sensory Processing Disorder – Part 2

In my last post I described several differences between SPD and misophonia that makes them distinctly different conditions.  But the biggest difference is between SPD stimuli and misophonia trigger stimuli.  The two conditions have, by the basic definitions of the disorders, mutually exclusive trigger stimuli.

Crunch of chip - MisophoniaAuditory Trigger Stimuli:  SPD triggers are Sticky substance - SPDvolume based.  Loud sounds such as a vacuum cleaner, toilet, loud toy, fireworks, etc.  Misophonia triggers are content related and soft sounds.  Examples include the sound of someone breathing, father chewing, soft sound of music through walls, typing, sniffing, etc.  Therefore, auditory triggers for SPD and misophonia are almost exactly the opposite.  SPD triggers are loud and do not depend on the content or source of the sound.  Misophonia triggers are soft sounds which must have specific content/meaning.  This alone indicates that SPD and misophonia are defined as distinctively different conditions.

Visual Trigger Stimuli:  As with auditory triggers, visual triggers are based on the intensity of the trigger for SPD vs. the specific image for misophonia.  SPD triggers include bright lights and fluorescent lights.  Misophonia visual triggers include such things as seeing a person chew gum, bouncing their leg, or pointing with one finger.  Again, misophonia triggers are low intensity with specific meaning/content/context, and SPD triggers are high intensity.

Tactile Trigger Stimuli:  SPD sufferers are often very sensitive to touch, such as tight shoes, clothes tags, being touched by another person, or certain textures.  Tactile sensitivity is very common with SPD, but tactile triggers are almost non-existent for misophonia.

It is just my guess that the individuals who are claiming that misophonia is a form of SPD are well-meaning individuals who are trying to get more research and public awareness for SPD.  I think they truly believe these conditions are related.  There was even a peer review journal article by academic researchers (Sensory Intolerance: Latent Structure and Psychopathologic Correlates by Taylor, et al., 2014), which called misophonia “auditory sensory intolerance” and suggested it should be a form of SPD.  But in their SPD study survey, participants were asked to rate their tactile intolerance by responding to the statement, “I am very bothered by certain tactile sensations, such as clothing textures or tightness; substances that feel sticky, greasy, or wet, or activities like haircuts or cutting my nails.” Auditory intolerance was assessed by the item, “I am very bothered by certain auditory sensations, such as the sound of alarms, sirens, appliances, or background noises like people talking or ticking clocks.”  Clearly these measures would not be used for assessment of severity of misophonia.

When we reviewed this journal article while preparing the manuscript of Misophonia Phenomenology, Impact, and Clinical Correlates, we noted that the Taylor article “investigated sensory intolerance to tactile stimuli and to loud or constant auditory stimuli.”  We concluded that “this definition is inconsistent with the description of typical trigger sounds in the misophonia literature (Edelstein et al., 2013; Jasterboff & Jasterboff, 2014; Schröder et al., 2013).

Comparing misophonia and SPD is like comparing influenza and malaria.  Symptomatically, both cause high fever and make you feel horrible.  But one is a viral infection and the other bacterial.  The treatment is completely different.

My heart goes out to anyone who has either of these conditions, and especially to those who are suffering from both.  But please, for the sake of both SPD and misophonia research, management, and treatment, let’s be clear that they are distinctively different conditions.  Misophonia can learn from SPD research, and SPD can learn from misophonia research, but I do not consider them to be forms of a larger, similar condition of sensory intolerance.  I wish success and progress to those researching SPD, and we (and others) will push forward with research on misophonia.  May we all be successful in our valiant efforts to help those with either or both of these conditions.

6 Comments

  1. Katie says:

    Hi Tom! Are you aware of any research that discusses misophonia being a genetic condition? I have it and so do two out of three of my siblings. My nephew also just started showing signs and we’re all searching for what to do… Thanks!

    • Tom Dozier says:

      There is no research on the genetic vs. environmental contributrions of misophonia. Remember that families share both genes and the environment. Children that are may be sensitive to the feelings of others, or may be strong-willed. Anxiety and depression also seem to contribute to the likelihood that a person will develop misophonia. All of these have both genetic and environmental factors.

      Please note, however, that it takes experience with a stimulus to develop a misophonic response to that stimulus.

  2. Wendy says:

    I still feel they are related if a person has both then it’s because they are connected and it’s neurological. You talk about the spd over stimulation but what about under responsive…..so spd is not loud for under responsive only for over responsive. Maybe a person has one or both. Misophonia is soft sounds yes but altogether it’s a sensitivity to sound. And a distraction.

    • Tom Dozier says:

      I know there are people who disagree with me on this point. Everyone is allowed to have their views. The biggest difference to me is that (from all my experience, research, and reading research of others) misophonia is a conditioned (learned) response disorder, and SPD is mostly a genetically caused condition. I suggest you read the “Personal Story – Developing Misophonia”. Misophonia is very different that SPD, but if a person has both SPD and misophonia, I see that they seem to be related.

  3. Peter says:

    I think you can keep drilling down and find differences that are distinct from one another. I have been driven to extremes because of misophoniaa since early childhood Auditory trigger stimulae and tactile issues are increasing in their clam our. I have immense trouble living with people and animals. I find repeated movements from others get to me. I have been diagnosed as OCD and it’s a relief finding that all these are real and acknowledged by some. Ideally I need to live alone and in silence. To cope I try to switch off but it turns me silent and requires serious will power to stay contained. Temper flashes are ever present but mostly under control. I have read your articles and understand the differences ad you define them, however notwithstanding that the stimulae may be different the underlying result is very similar and aggravated by the multiple sources. There must be a connection within that responds similarly.

  4. Very clear and well stated.

Leave a Reply

Your email address will not be published. Required fields are marked *