rTMS for Executive Function Deficits in Autism Spectrum Disorder
Autism Spectrum Disorder
About this trial
This is an interventional treatment trial for Autism Spectrum Disorder focused on measuring Autism Spectrum Disorder, Executive Function, rTMS (Repetitive Transcranial Magnetic Stimulation), MRI (Magnetic Resonance Imaging), Healthy Subjects
Eligibility Criteria
Inclusion Criteria Autism Spectrum Disorder (ASD):
- Are fluent in the English language
- Have a diagnosis of high functioning ASD (HF-ASD) (i.e., are verbal with an Intelligence Quotient (IQ) ≥ 70)
- Are competent to consent based on the subjects' ability to provide a spontaneous narrative description of the key elements of the study
- Are clinically stable as determined by their treating physician, with no medication changes over the past 4 weeks
Exclusion Criteria (ASD):
- Have a history of substance abuse or dependence in the last 6 months or have a positive urine toxicology screen
- Have a concomitant major medical or neurologic illness
- Have had a seizure in the past, or have a first-degree relative with epilepsy
- Have an abnormal clinical EEG
- Are pregnant or likely to get pregnant during the next 4 weeks
- Are clinically unstable
- Are on benzodiazepines or anticonvulsant medication
- Have a history of rTMS treatment.
Inclusion Criteria (Healthy Controls):
- Are fluent in the English language
- Competent to consent
Exclusion Criteria (Healthy Controls):
- Have a history of substance abuse or dependence in the last 6 months or have a positive urine toxicology screen
- Have a major medical or neurologic illness
- Have a diagnosed learning disorder or impaired academic or adaptive functioning on history
- Are pregnant
- Have an IQ < 80
- Have a psychiatric diagnosis on diagnostic interview assessments.
Sites / Locations
- Centre for Addictions and Mental Health
Arms of the Study
Arm 1
Arm 2
Active Comparator
Sham Comparator
Active rTMS
Sham rTMS
Active treatment will be delivered at an intensity that is 90% of the resting motor threshold (RMT). Stimulation will be delivered at 20 Hz with 25 simulation trains of 30 stimuli each (i.e., 750 stimuli) and an intertrain interval of 30 sec. Treatment will be applied in sequential order bilaterally to the left and right dorsolateral prefrontal cortex (DLPFC). The order of bilateral stimulation (i.e. right then left or left than right) will be held constant for all 20 treatments. Intervention: Device: Repetitive Transcranial Magnetic Stimulation
Sham stimulation will be delivered using the same stimulation parameters and at the site of active treatment, but with only the side-edge resting on the scalp. The coil will be angled 45 degrees way from the skull in a single-wing tilt position. This method produces sound and some somatic sensation (e.g. contraction of scalp muscles) similar to those of active stimulation, but with minimal direct brain effects. Intervention: Device: Repetitive Transcranial Magnetic Stimulation