Overview
In the current project, investigators have two main goals: i) Testing whether an excessive plasticity, i.e. hyperplasticity in the motor cortex underlies motor function difficulties in autistic adults, and ii) Using repetitive Transcranial Magnetic Stimulation (rTMS) with autistic adults to examine whether resulting reduced hyperplasticity in the motor cortex will be associated with clinical improvements in the motor function.
Description
Autism spectrum disorder (ASD) is a very common developmental condition, yet the cause remains unknown and effective treatment options to improve outcomes remain limited. Most autistic adults experience significant motor function difficulties involving balance, posture, coordination, and strength that negatively affect their quality of life, social interaction, confidence and daily functioning. Therefore, such difficulties remain an important treatment target. However, there are no known effective clinical interventions for such difficulties. Investigators previously showed that the part of the brain that controls motor movements, i.e. motor cortex, showed hyperplasticity, as assessed by theta-burst magnetic brain stimulation (TBS), in autistic adults. Hyperplasticity may adversely affect brain health and behavior. Investigators also previously found that rTMS may reduce such hyperplasticity in the motor cortex in autistic adults.
In this project, 100 autistic adults with significant motor function difficulties and 50 neurotypical (NT) controls matched 2:1 based on age, sex, and IQ will be recruited. At the Centre for Addiction and Mental Health, Toronto, each autistic adult's participation will consist of nine visits, while each NT adult's participation will include two visits.
All participants, both autistic and NT, will undergo clinical, adaptive, and motor function assessments during their first visit (lasting approximately 3 hours) and a preand post-intermittent-TBS (iTBS) session with electroencephalography (EEG) to induce and assess plasticity in the left or right motor cortex (depending on handedness) during their second visit (lasting approximately 2.5 hours). Based on the preliminary evidence that rTMS reduces hyperplasticity in the motor cortex in autistic adults, the investigators will then use a randomized, double-blind, sham-controlled design for bilateral 5-session rTMS on the motor cortex. Autistic participants will be randomized (1:1, sex-stratified) to receive either active or sham rTMS (120 trains of 50 pulses with an inter-train interval of 30 seconds, delivered at 90% of the resting motor threshold for both conditions) five days a week (approximately 1 hour each), from their third to seventh visits (total of 5 sessions). Assessment of motor and adaptive function, and plasticity in the motor cortex will be repeated immediately, one week (eighth visit), and four weeks (ninth visit) after the last rTMS session (i.e. 5th session).
Eligibility
Inclusion Criteria:
ASD or control participants must meet all of the inclusion criteria to eligible for this study:
- Aged between 18 and 40 years old. 40 years is chosen as the cut-off because of the report of high rates of Parkinsonism in autistic adults > 39years;
- Have IQ>70;
- Are able to read, write and communicate effectively in English;
- Are able to provide informed consent. We will recruit only intellectually-able autistic adults. The intellectual ability will be determined using WAIS. The ability to provide consent will be determined using clinical assessment.
- Have no prior history of seizure;
- Must sign and date the informed consent form;
- Stated willingness to comply with all study procedures;
- Agreement to adhere to Lifestyle Considerations throughout study duration.
All ASD participants:
- Will have DSM-5 diagnosis of ASD without intellectual disability, confirmed by clinical assessment and the Autism Diagnostic Observation Schedule - 2 (ADOS-2);
- Will have significant motor function difficulties defined as a standard composite score <40 (i.e., >1 standard deviation below the mean) on either fine or gross motor composite scores of the Bruininks-Oseretsky Test of Motor Proficiency, Second Edition or BOT-2;
- Are clinically stable as determined by clinical assessment, with no medication changes over the past 4 weeks. Given the high variability of handedness in ASD, we will include participants with left, right or mixed handedness.
Exclusion Criteria:
ASD or control participants will be excluded if they experience/have:
- Current pregnancy;
- Current or past history of co-morbid medical condition that may require urgent medical intervention;
- DSM-5 substance use disorder (other than tobacco) within the past 6 months; however, all participants will be asked to refrain from smoking or taking caffeine four hours prior to the iTBS session;
- Significant hearing or visual impairment interfering with the ability to read or hear instructions;
- Significantly debilitating medical or neurologic illness (e.g., encephalitis, aneurysms, tumors, central nervous system infections), or acute or unstable medical illnesses as determined by project physician (e.g., uncontrolled diabetes);
- Metal implants or a pace-maker;
- Prior rTMS treatment;
- Claustrophobia;
In addition ASD participants will be excluded if they report taking benzodiazepines or anticonvulsants currently.
NT controls will be excluded if they have:
- Presence of psychopathology other than specific phobia, as screened by Personality Assessment Inventory and;
- A known diagnosis of Pervasive Developmental Disorder or ASD among any biologically related family members.