This study aims to evaluate the feasibility of novel cognitive behavioural therapy (CBT)-based intervention designed to improve functional memory symptoms after concussion. Participants will be randomized to CBT or an attention-matched control intervention (cognitive rehabilitation). The primary outcomes for this trial are feasibility metrics, including recruitment, patient-perceived credibility of treatment, patient adherence to treatment, therapists' compliance with the treatment protocol, and retention.

Background: Although objectively measurable memory impairments typically resolve within weeks after sustaining a concussion, many people continue to perceive memory problems one year later. There are no known effective treatments for this condition. A promising new approach may be to target psychological mechanisms that perpetuate excessively negative perceptions of memory ability.

Methods: A pilot randomized controlled trial to evaluate the feasibility of a new cognitive behavioural therapy (CBT)-based treatment program specifically designed to improve persistent memory complaints after concussion. The main inclusion criteria will be (i) concussion in the past 6 to 24 months, (ii) research diagnosis of Functional Cognitive Disorder. Participants will be randomized (1:1) into one of two groups: CBT or cognitive rehabilitation. Individuals in both groups will participate in 11 x 50-minute sessions delivered over Zoom videoconference, co-facilitated by clinical psychology graduate students under the supervision of a registered clinical psychologist.

Aims: To evaluate the feasibility and potential efficacy of CBT for functional memory symptoms after concussion.

Approach: Prespecified feasibility criteria on recruitment, patient-perceived credibility of treatment, patient adherence to treatment, therapists' compliance with the treatment protocol, and retention will determine the success of the pilot trial. The investigators further hypothesize that CBT will be associated with greater reductions in memory concern compared to the control intervention.

Implications: The results of this pilot study will inform a larger, more definitive clinical trial focused on testing efficacy.

Inclusion Criteria:

• Age 18-65 years old
• Fluent in English
• Have regular access to the internet
• Sustained a concussion according to the World Health Organization Neurotrauma Task Force definition between 6 and 24 months ago
• Meet diagnostic criteria for Functional Cognitive Disorder

Exclusion Criteria:

• Performance validity test failure
• Unstable/serious medical condition (e.g., cancer, multiple sclerosis, etc.),
• Unstable severe/mental illness (e.g., schizophrenia requiring hospital admission in the past year)
• Probable alcohol or drug use disorder
• Taking a medication with a known side effect of memory impairment (e.g., benzodiazepines, opiates, or topiramate)
• Contraindication(s) for MRI

Upon reasonable request

12 months after publication

Defined research question approved by the principal investigator

Participants will be blinded to their group assignment and treatment arms, but not to the type of intervention they are receiving. It is not possible to blind study therapists, as they have to administer the therapy.