The word tics, when referring to behaviors present in autistic individuals, is often used in a colloquial manner when discussing observed repetitive behaviors. Repetitive behaviors are a common trait observed in the autistic community and can manifest in a variety of ways, with many autistic people engaging in multiple different repetitive behaviors in the course of a day. Tics and stereotypies are the most common examples of inadvertent behavior in autistic people. These behaviors are generally non-purposeful and are often elicited by changes in the person’s environment.
While tics and stereotypies can co-occur frequently in autistic individuals, it is important to differentiate between the two in order to better understand why they are occurring and determine the appropriate treatment options for the behaviors. While tics and stereotypies are often first observed in infants, these repetitive behaviors can continue into adolescence, and recognizing them can be an important part of identifying symptoms of autism in teens.
Tics Vs. Stereotypies
When related to autism, both tics and stereotypies present as repetitive and patterned behaviors and movements. These behaviors can often lack obvious context and provocations, which can provide some explanation as to why the terms are often used interchangeably. Tics and stereotypies are typically transient (come and go), which can make it even more difficult to predict and determine whether treatment is necessary and beneficial. In some cases, both tics and stereotypies can persist to a level that causes distress to the individual and their family.
1. Tics
In general, the word ‘tic’ is used to describe sudden, rapid, and repetitive movements or vocalizations that are for the most part, but not always, involuntary. Tics are a symptom of neurodevelopmental conditions, the most common being tourettes syndrome, and can range from simple movements to complex motor sequences. Tic disorders emerge in childhood, and can be co-occurring with developmental disabilities such as Autism (ASD), Attention Deficit Hyperactivity Disorder (ADHD), or Obsessive-Compulsive Disorder (OCD).
Tics that emerge due to the development of these neurodevelopmental conditions fall into two categories – motor tics and vocal tics. Autism ‘tics’ can also fall into these two categories, but are more accurately referred to as stereotypies.
Common Examples of Tics
- Motor tics: excessive blinking, facial movements, eye rolling, and sudden movement of limbs
- Vocal tics: grunting, sniffing, and throat clearing
2. Stereotypies
It is extremely common for autistic individuals to engage in stereotypic behavior. Stereotypic behavior can manifest in motor movements, vocalizations, and in some cases even extreme rigidity surrounding rule-governed activities and tasks (such as following the steps to a routine, or completing an activity exactly the way the rules describe).
Stereotypic behaviors are often known as ‘stimming’ behaviors and most commonly provide sensory input for the autistic individual. These behaviors can also serve to stop undesirable sensory experiences for the person.
Stereotypic behaviors are more rhythmic than tics, and seem to be more purposeful and less involuntary for the person displaying them. By rhythmic, we mean that the behaviors are not only repetitive, but also follow what seems to be a regular and predictable pattern or sequence. For example, the behavior of rocking back and forth has rhythm, as well as tapping objects in a particular pattern. It is said that the rhythm is a defining characteristic of stereotypic behaviors and aids in self-regulation.
Stimming often assists the individual in the processing of information about their place in space, motion, and spatial orientation. It can also reduce anxiety for the individual by soothing interruptions in their sensory experiences by providing predictability and sensory input.
A notable difference between stereotypic behavior and tics is that stereotypic behavior is more likely to be influenced by the manipulation of the environment, and by teaching the individual replacement behaviors that serve the same function, as well as self-management skills.
Common Examples of Stereotypies or “Stimming”
- Whole body movements such as twirling, jumping, pacing, spinning, and body rocking
- Hand-flapping, head-banging, staring at moving objects or flickering lights, excessive rubbing of the skin
- Scripting (repeating learned words and phrases), humming, and repetitive vocalizations
- An intense resistance to change and rigidity in routine-based activities
Autism Tics Examples
Autism tics are sudden, repetitive movements or sounds that may appear in children or adults on the spectrum. These can vary in intensity and frequency, often becoming more noticeable during times of stress, excitement, or fatigue. Below are some common examples:
1. Motor Tics
- Excessive eye blinking
- Facial grimacing or twitching
- Shoulder shrugging
- Head jerking or nodding
- Finger tapping or repetitive hand movements
2. Vocal Tics
- Throat clearing
- Sniffing or humming
- Grunting or squeaking sounds
- Repeating certain words or syllables
3. Overlapping Stims (often mistaken for tics)
- Hand flapping
- Rocking back and forth
- Repetitive tapping or pacing
While many autism tics are harmless, they can sometimes interfere with daily activities or social interactions. Understanding the difference between autism tics and stimming is important for choosing the right support strategies.
Even in very young children, such as babies and toddlers, certain repetitive movements or sounds – though often subtle can be recognized as potential signs of autism in infants.
📌 MUST READ :
Signs of Autism in 1 Year Old
Signs of Autism in 2 Year Old
Prevalence and Impact of Stereotypy in Autistic Individuals
Engaging in stereotypic behavior is one of the most common visible symptoms of autism spectrum disorder and thus, has become a core feature in determining treatment plans and support strategies for the person impacted. The level of engagement in these behaviors is widely varied and is influenced by a variety of factors such as age, developmental level of the individual, and any co-occurring conditions that the individual experiences.
Prevalence :
There has been an extensive amount of research conducted surrounding stereotypic behavior and the relation it has with autism. In a particularly interesting study conducted by the University of Montreal, researchers looked into the prevalence of stereotypies that involve the whole body, hands and fingers, use of objects, locomotion, vocal, and sensory in individuals with a variety of developmental disabilities.
The study conducted an extensive review of almost 500 studies with a total of well over 1000 participants, with the most prominent developmental disability shared by the participants being ASD. The results of this study determined that over 60% of people with autism engaged in these types of stereotypic behavior.
Interestingly, stereotypy was observed in 61% of adults, and 57% in children, a very minimal difference in the overall scope of stereotypy presentation for people with developmental disabilities. The study also found that the most frequent type of stereotypy for adults was whole body movement and for sensory related stereotypies for children. The study also provided the finding that stereotypy is most commonly related to ASD compared to the other developmental disabilities that the participants presented with.
Impact :
As you can imagine, engaging in regular stereotypic behavior of any kind can have a severe impact on the affected person and the world around them. Stereotypy can be socially stigmatizing, impacting the person’s ability to interact positively within social situations. This is because many typically developing people are unfamiliar with autism and the reason behind the behaviors, the behaviors can be a barrier in communication, and the many factors that go into social situations can impact the frequency and severity of the behaviors. Being stigmatized in this way can lead to significantly impacted social skills, a reduced desire to seek social interaction, and be a barrier to the formation and maintenance of reciprocal relationships..
Stereotypy can also interfere with learning, providing both internal and external barriers to the completion of tasks and retention of information. Accessing the community is also another area that could be impacted due to the common lack of understanding and misconceptions surrounding stereotypy, resulting in negative experiences for the person affected.
When looking at stereotypy, and in particular causes and treatment, it is crucial to first determine the underlying reasoning, or function, of the occurrences of the behavior. Increasing our understanding of why this behavior occurs for this individual will give us the insight needed to provide assistance to the person only when actually necessary.
High-Functioning Autism Tics
High-functioning autism tics are sudden, repetitive movements or sounds that may appear in individuals with high-functioning autism. These can include eye blinking, throat clearing, facial grimacing, or shoulder jerks. While they resemble tics seen in Tourette syndrome, in autism they may overlap with stimming behaviors – self-stimulatory actions used to regulate emotions or sensory input.
Most of the time, these tics are harmless, but if they cause distress, interfere with daily life, or worsen over time, professional evaluation is recommended. They may become more noticeable during times of stress, anxiety, or fatigue. Early support, therapy, and stress management can help reduce the impact of these tics on daily functioning.
Examples of high-functioning autism tics include:
- Motor Tics: eye blinking, shoulder shrugging, facial grimacing, head jerking, or finger tapping.
- Vocal Tics: throat clearing, humming, sniffing, grunting, or repeating certain sounds.
- Overlapping Stims: hand flapping, rocking, or repetitive tapping that may look like tics but are often used for self-regulation.
These tics can come and go, become more noticeable during stress or excitement, and vary in intensity from mild to disruptive.
Functions of Behaviour and Potential Causes
In the analysis of behavior, there are four functions, or reasons, as to why behavior occurs. These are attention, escape or avoidance, access to tangible items, and sensory stimulation – also known as the automatic function.
Stereotypy can be multi-functional in the sense that the behavior can address two needs at once. For example, the behavior of banging one’s head can serve a sensory input need (automatic function) while also facilitating an escape from an aversive environmental stimulus, such as a writing task (escape function).
The most prominently cited function for stereotypy is, however, automatic reinforcement.
Automatic Reinforcement
Automatic reinforcement refers to the process in which a behavior that is exhibited by an individual is reinforced (and therefore more likely to continue) by a positive sensory consequence. For example, a self-stimulatory behavior such as pacing back and forth, can be maintained by the positive internal sensory feeling the person experiences from it. The behavior can become a form of self-soothing for the individual as it generates its own reinforcement and is a quick and easy solution for feeling overwhelmed or out of sorts.
Automatically reinforced behaviors provide sensory input for the individual across various domains such as visual, auditory, tactile, vestibular, taste, and smell. Attempting to influence a self-reinforcing behavior is difficult and can require specific intervention to assist in replacing the behavior with a more constructive one.
A telltale sign of a behavior that is automatically reinforced is to note whether the behavior continues when reinforcement is removed. In order to concretely determine what the function of the behavior is, however, a functional analysis needs to be completed.
Functional Analysis (FA)
A functional analysis of behavior is a process used to determine the function of the behavior. The initial stages of the FA are used to determine the frequency and severity of the behavior and any influential environmental variables. From here, a hypothesis will be formed before functional testing begins.
Functional testing involves manipulating those pre-determined environmental variables in a range of conditions to identify increases or decreases in the target behavior. The results of this testing will determine the function of the behavior and inform intervention processes.
A functional analysis will also inform the researcher as to whether a behavior is multi-functional, if it is receptive to change through environmental manipulation, and give a detailed description of exactly what leads to the occurrence of behavior and how it is being maintained/why it is ongoing.
Intervention
Interventions are completely dependent on the function of the behavior. Interventions should be specifically tailored to the individual and the particular presentation of the stereotypy (or any behavior in general).
1. Intervention Strategies
The most important intervention for stereotypy in particular, is to provide replacement behaviors that are more ‘socially-acceptable’ but that also still meet the needs that the stereotypy was meeting for the individual.
When stereotypy is present due to a communication barrier, functional communication training can be used to teach the person to communicate in a more effective way. Pro-active interventions such as adjusting the environment can cause a reduction in the individual’s desire to engage in stereotypy in the first place, and is therefore a common intervention used in behavior analysis.
Sensory interventions should also be considered, with the sensory needs of the individual kept at the forefront of implementation. Redirection, distraction, and providing clear expectations and predictability in the individual’s day-to-day life are also widely used to assist in behavioral change.
Finally, empowering the people in the autistic person’s world to identify stereotypy and implement naturalistic interventions can be crucial to influencing the maintenance and therefore the reduction of the behaviors.
2. Freedom to Engage in Behaviors
With all of this being said, just because an autistic person is engaging in stereotypy, does not mean that these behaviors must be reduced. It is important that autistic people are free to engage in behaviors that promote individuality and autonomy for the person. Autistic people are entitled to feel in control of their own body, just as anybody else is, and therefore intervention should only occur when the stereotypy is becoming a barrier to socially significant skill acquisition, safety, or well-being.
Stereotypy, although stigmatized and largely misconceptualized, assists in reducing stress, communicating, emotional regulation, and self-expression for the individual who experiences it.
FAQ’s on Autism Tics
Are tics a sign of autism?
Can autism cause tics?
Why has my child suddenly developed a tic?
Should tics in autism be treated?
When to worry about childhood tics?
Conclusion:
There is a distinct difference between the phenomena of tics and stereotypy. Tics can co-occur with autism, however are generally the result of neurodevelopmental conditions that emerge in childhood. They are classified as vocal and motor tics and are largely involuntary. Stereotypy is commonly known as ‘stimming’ and defines the engagement in repetitive, rhythmic movements and vocalizations that serve a function for the individual.
Understanding and addressing stereotypic behaviors in autistic people is crucial in providing adequate support, intervention, and care. These behaviors serve multiple functions and can provide the person with a sense of balance, safety, and regulation. These behaviors are often reinforced by automatic reinforcement, or positive sensory experiences that are not observable by others, making them resistant to change and intervention.
Interventions for stereotypy should be completely individualized and determined through thorough functional analysis of the behavior. By doing so, behavior support experts will be able to determine what causes the behavior, and what maintains it.
It is important to ensure that in seeking intervention for stereotypy, we are promoting acceptance for the autistic community. We can do this by only intervening when absolutely necessary, and not seeking to reduce stereotypy that does not have a socially-significant negative impact on the person and their world. Ensuring that autistic people feel supported within society to be autonomous and express themselves however they please fosters development of relationships, and a sense of belonging and safety among peers and the community.
📌 Reference :
- https://papyrus.bib.umontreal.ca/xmlui/bitstream/handle/1866/19833/Chebli%20et%20al.%20%282016%29%20self-archive.pdf?sequence=1
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2598746/
- https://pubmed.ncbi.nlm.nih.gov/30773283/
- https://www.research.chop.edu/car-autism-roadmap/stimming-what-is-it-and-does-it-matter
I am a dedicated educator turned Board Certified Behavior Analyst with a deep passion for helping neurodivergent children and their families achieve positive and lasting behaviour change.
My background in teaching has given me a strong foundation in understanding the unique needs of neurodivergent learners. Now, as a BCBA, I am thrilled to be working with Autism 360, where I am committed to providing invaluable support to families within the autistic community, both locally and afar.
