The Use of Transcranial Direct Current Stimulation (tDCS) in Adults With Developmental Disabilities

N/ARecruitingNCT04732052

Dr. Najat Khalifa60 enrolled

Overview

Aggressive behaviours are highly prevalent among people with developmental disabilities, both in community and inpatient or residential settings, with adverse consequences for the individuals involved and others. Some predictive factors, particularly impulsivity, are dynamic with neurobiological underpinnings, and as such amenable to change or neuromodulation using non-invasive brain stimulation techniques. With this in mind, we designed an experimental protocol to determine the efficacy of transcranial Direct Current Stimulation (tDCS) as a non-invasive brain stimulation technique to reduce impulsivity and aggression associated with developmental disability.

This study aims to assess the efficacy of anodal tDCS in modulating Rapid Response Impulsivity (RRI) and reducing incidents of aggression in people with developmental disabilities is residential or hospital settings. Using a single blind, parallel arms, randomized controlled trial design, adults (n=60) aged 18 to 65 with developmental disabilities, who have a history of impulsivity leading to aggression, will be randomised to receive either repetitive anodal or sham tDCS. Enrolled participants will receive either three treatment sessions of tDCS or sham tDCS. Behavioural and impulsivity will be measured before and immediately after treatment, one week, and one month after treatment end. Data will be analysed in SPSS using repeated measures ANOVA.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

Conditions

Aggression

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Adults aged 18-64 years * Diagnosis of a developmental disability * History of one or more incidents of aggression in the last month * Consent to participate in the trial by the individual or their Substitute Decision Maker Exclusion Criteria: * History of epilepsy or seizures * History of acquired brain injury * Having metal in the brain/skull, e.g. splinters, fragments or clips * Having a cochlear implant * Having an implanted neuro-stimulator (e.g. direct brain stimulation, epidural/subdural stimulation, vagal nerve stimulation) * History of brain surgery of procedure * History of severe adverse reaction to tDCS * Having a cardiac pacemaker or intracardiac lines * Current alcohol or drug misuse * Having a sensitive scalp

Outcomes

Primary Outcomes

Aggression

To determine the effect of tDCS treatment on aggressive symptoms measured by The Modified Overt Aggression Scale (MOAS); Total weighted scores range from 0-40, with a higher score indicating more aggressive behavior.

Time frame: change from baseline one week and one month after the third tDCS session

Secondary Outcomes

Maladaptive behaviors

Behavior Problems Inventory (BPI); The total frequency scores range from 0-120 and severity of self-injurious behaviour and aggression subscales from 18-54, with higher scores indicating higher frequency and severity

Time frame: change from baseline one week and one month after the third tDCS session

Intervention side effects

Tracking potential side effects of tDCS/sham treatments using tDCS adverse effects questionnaire.

Time frame: Up to 72hrs after the first, second, and third active or sham tDCS treatments.

Trait Impulsivity

Barratt Impulsiveness Scale-11 (BIS-11); The total scores range from 30 - 120, with higher scores indicating higher impulsivity.

Time frame: Baseline

Impulsivity

To determine the effects of tDCS treatment on symptoms of impulsivity measured by the Stop Signals Task (SST)

Time frame: change from baseline and the same day after the third tDCS sessions

Treatment Acceptability

Total scores on the tDCS Treatment Acceptability Questionnaire

Time frame: Up to 72hrs after the third active or sham tDCS treatments.