Sensory Processing and Regulation in Autism - עיבוד וויסות חושי בקרב אוטיסטים
- motim51
- Jul 31
- 5 min read
Sensory processing and regulation are neurological bodily processes that occur in every person.
When there is an increased amount of sensory input, our brain uses regulatory mechanisms to manage these stimuli and maintain a level of arousal that allows us to function.
When there are challenges or difficulties in this regulation, sensory overload may occur, leading to impaired functioning and difficulties with sensory regulation.
Sensory processing is not limited to sensitivity to noise or aversion to certain textures. It involves a fundamentally different pattern of neural wiring that affects the way the brain receives, interprets, and responds to stimuli from both the external environment and the body itself.
For many years, sensory characteristics were regarded only as secondary symptoms. Today, scientific research recognizes that distinct sensory processing is a central core feature of autism.
This understanding was also formally recognized in the American diagnostic manual, the DSM-5, which included hyperreactivity, hyporeactivity, and sensory-seeking behaviors among the diagnostic criteria for autism.
In the past, difficulties with sensory regulation were often perceived as behavioral problems in autistic individuals.
Today, we know that differences in sensory processing are a core neurological characteristic of autism, affecting between 70% and 90% of autistic children and adults.
Sensory Processing
To understand sensory regulation, it is important to be familiar not only with the primary senses (vision, hearing, taste, smell, and touch) but also with three important internal senses:
The vestibular sense: Responsible for balance, head movement, motion, spatial orientation, and the sense of gravity.
The proprioceptive sense: Receptors in the muscles and joints provide the brain with information about where the body is in space and how much force is being used.
Interoception: Internal bodily sensations, such as heartbeat, hunger, thirst, pain, or the need to use the bathroom.
In addition, there are the more familiar senses:
Vision: Detects light, patterns of movement, and visual overload.
Hearing: Processes sounds, pitch, and background noise.
Touch and pain/temperature: Includes touch, texture, pressure, the perception of heat and cold, and the sensation of pain.
Oral sensation/taste/smell: Includes taste, smell, and oral textures.
Sensory processing is not a single ability. It includes detection (noticing a stimulus), regulation (adjusting the intensity of the response), discrimination (distinguishing between stimuli), and integration (combining information from different senses). Difficulties may occur at any of these levels and may vary across different sensory systems within the same person.
Three Main Sensory Response Patterns in Autism Research
The literature on sensory processing in autism generally identifies three main response patterns:
Hyperreactivity: An excessive or heightened response to sensory input. A person may be disturbed by sounds that others barely notice, become overwhelmed by fluorescent lighting, or be unable to tolerate certain clothing textures.
Hyporeactivity: A reduced, delayed, or absent response to sensory input. A person may not notice when their name is called, may respond slowly to pain, or may not detect changes in temperature.
Sensory seeking: The active pursuit of sensory input. This may include seeking deep pressure, repetitive movement, strong flavors, or visual stimulation.
The same person may simultaneously display hyperreactivity to sound, hyporeactivity to pain, and sensory-seeking behavior related to touch.
Dunn’s Four-Quadrant Model
A widely used sensory processing model that supports clinical assessment and treatment is Winnie Dunn’s Four-Quadrant Model. The model organizes sensory responses along two continua:
Neurological threshold: high versus low, that is, how much sensory input is required for a person to notice a stimulus.
Behavioral response style, active versus passive.
The interaction between these two dimensions produces four quadrants:
Sensory Processing vs. Sensory Regulation
A distinction that can sometimes be confusing is the difference between sensory processing (how the nervous system detects and responds to sensory input) and sensory regulation (how a person responds to or maintains a level of arousal that enables functioning when sensory input becomes excessive, insufficient, unpredictable, or difficult to integrate).
Sensory regulation includes both conscious and unconscious strategies that a person uses to manage their physiological and sensory state.
Examples:
Repetitive movements (stimming): Hand flapping, rocking, pacing, or vocal repetition. These movements often serve a self-regulatory function by providing predictable and controllable sensory input.
Seeking deep pressure: Using weighted blankets, tight-fitting clothing, or firm hugs to calm the nervous system.
Environmental control and routines: Insisting on using the same cup, taking the same route, or sitting in the same seat, strategies that reduce sensory uncertainty.
Withdrawal and avoidance: Moving away from noisy environments, avoiding certain textures or foods, or limiting social exposure.
Shutdowns and meltdowns: These are involuntary nervous-system responses to acute distress. When the sensory system becomes overwhelmed and is unable to regulate the incoming stimuli, the brain may interpret the situation as an immediate and tangible threat. This activates the sympathetic nervous system (the fight-or-flight response) which may lead either to withdrawal from the environment and a loss of functioning (shutdown) or to outwardly expressed distress involving a loss of behavioral control (meltdown).
These are not behavioral problems. They indicate that the nervous system’s capacity for regulation has been overwhelmed.
Understanding sensory regulation sheds a different light on many behaviors that are often classified as pathological. Avoidance, repetitive behavior, and insistence on routines are frequently adaptive regulatory strategies, representing attempts to manage a nervous system that experiences the sensory world differently.
The relationship between sensory processing and emotional regulation is bidirectional. Sensory differences may increase anxiety and emotional dysregulation. Conversely, heightened stress and anxiety may further increase sensory sensitivity, creating a cycle that can make everyday functioning particularly challenging.
The Importance of Understanding Sensory Processing and Regulation in Autism
The goal of understanding sensory processing and regulation in autism is not to normalize sensory responses. Sensory differences among autistic people are part of autism.
They can be a source of distress, but they can also be a source of deep engagement, intense interest, and a unique perceptual experience.
Some sensory seeking behaviors are viewed positively by autistic people themselves.
The most effective and recommended approach is to understand each person’s unique pattern, including their sensitivities, sensory seeking, thresholds, and regulation strategies across each sensory system.
Once the individual sensory profile has been understood, the goal is to reduce the mismatch between the person’s nervous system and the environments they navigate.
This means shifting the focus away from correcting the individual’s sensory responses and toward adapting environments, expanding access to regulation strategies, and respecting the legitimate communicative and regulatory functions of autistic sensory behaviors.
In the next post, we will discuss general strategies and adaptations for the different sensory systems in greater detail.
References:
Dunn, W. (2014). Sensory profile 2. Bloomington, MN, USA: Psych Corporation.
Fabbri-Destro, M., Maugeri, F., Ianni, C., Corsini, S., Di Stefano, E., Scatigna, S., ... & Narzisi, A. (2022). Early sensory profile in autism spectrum disorders predicts emotional and behavioral issues. Journal of Personalized Medicine, 12(10), 1593.
Patil, O., Kaple, M., & Kaple, M. N. (2023). Sensory processing differences in individuals with autism spectrum disorder: a narrative review of underlying mechanisms and sensory-based interventions. Cureus, 15(10).
Schaaf, R. C., Puts, N. A., Williams, Z. J., & Woynaroski, T. (2024). Forwarding the science of sensory features in autism and related conditions. Journal of autism and developmental disorders, 54(7), 2663-2667.
Williams, Z. J., Schaaf, R., Ausderau, K. K., Baranek, G. T., Barrett, D. J., Cascio, C. J., ... & Woynaroski, T. G. (2023). Examining the latent structure and correlates of sensory reactivity in autism: a multi-site integrative data analysis by the autism sensory research consortium. Molecular Autism, 14(1), 31.
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