Developing Process-Specific Verbal Memory Interventions for Veterans With Tramatic Brain Injury (TBI)

NCT ID: NCT02310633

Last Updated: 2024-11-01

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 8 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2015-01-05
• Study Completion Date: 2017-12-29

Brief Summary

Blast-related and blunt traumatic brain injury is a key priority area of Rehabilitation Research & Development (RR&D) and represents a critically important public health problem facing the Veteran population. Developing efficacious treatments for persistent memory deficits seen in this population is a key step in reducing the impact that such problems have in the everyday lives of Veterans. Memory problems after TBI in Veterans are quite heterogeneous, and efficacy will likely be maximized by developing and disseminating multiple alternative treatments individually matched to the Veteran's key deficits, and by research that seeks to understand the cognitive and neural basis of treatment-related change over time. The results of this approach may aid clinical decision making and assignment of patients to rehabilitative treatments most likely to improve memory capacity and functional outcome.

Detailed Description

Memory dysfunction can result from impairments along a continuum of information processing, from poor initial acquisition of information during learning to disturbed retrieval of stored memory when it is later needed to perform a task1. The heterogeneous nature of TBI-related memory impairment is well-known, and there is a critical need to better understand such disease heterogeneity in order to enhance diagnosis and therapeutic management2. Several subtypes of memory dysfunction after TBI have been identified3,4. First, some TBI survivors exhibit impaired memory acquisition/encoding (e.g., frontal system damage)5. Second, some exhibit impaired memory consolidation/storage impairment (e.g., prominent damage to temporal lobe systems6). Third, some show impairment in retrieval of information5,7. This heterogeneity results from the variable nature and severity of underlying brain trauma resulting from unpredictable mechanical forces2,8.

It has been suggested that parsing this underlying variability should take precedence over generalities regarding the effect of TBI on memory when conceptualizing or treating memory disorders in this population8 Nevertheless, many rehabilitation programs utilize a "one size fits all" approach to memory training, based (typically) on training compensatory strategies, with no training specifically targeted to the identifiable component processes of memory that could be differentially impaired (encoding, consolidation/storage, and retrieval), and which might respond differentially to more specifically targeted treatment. This situation in clinical practice is due to the lack of evidence upon which to base informed decision-making in allocating specifically targeted memory re-training for individual survivors of TBI, based on clinical test results identifying which memory component processes are impaired (encoding, consolidation/storage, and retrieval). Because of this, there is little attempt to appropriately match patient impairment to targeted treatments.

There are existing training protocols for training these three components of memory processing, as follows: encoding (memory strategy training9), consolidation (errorless learning10), and retrieval (retrieval practice11, but their efficacy has not been tested in TBI survivors with documented impairments in each component. That is, to the investigators' knowledge, there is no solid evidence for memory training in TBI survivors that supports the widely held belief that specifically matching the patient impairment to the treatment leads to better treatment outcomes. This proposal attempts to fill this gap in the investigators' knowledge. Prior to testing the efficacy of these three types of training in a large trial, it is important to make standard preparations, such as refining and testing training materials and ensuring fidelity of treatment methods across clinicians.

Aim 1. Aim 1 is to refine and validate three separate, process-specific memory rehabilitation treatments that focus on improving information-processing at the encoding, consolidation, or retrieval stage for Veterans with chronic moderate/severe TBI.

Objective 1.1. Generate treatment manuals for three process-specific memory treatments.

Objective 1.2. Test and refine treatment fidelity so that each of the three interventions can be reliably delivered by different clinicians.

Aim 2. Aim 2 is to provide a preliminary test of the response to the three memory interventions. At baseline, TBI survivors will be evaluated for memory function in each of these three memory component processes using established neuropsychometric methods. Their experimental treatment allocation will be to the treatment targeting their most impaired memory component. In addition, each subject will serve as his/her own control, by engaging in a treatment targeted to another memory component ('mismatched' group).

Hypothesis A. Matched vs. mismatched group will show differential improvement in memory component function, with the former group benefitting to a significantly greater degree. (Primary measures: Memory component performance, encoding, consolidation, retrieval; secondary: cognitive function and quality of life).

Aim 3. Aim 3 is to establish links between the behavioral taxonomy of the three memory components and differences in brain structure and function documented with diffusion tensor imaging and functional connectivity analysis. This is a key first step in establishing brain-based metrics of neuroplastic change after memory therapy in the investigators' research program.

Objective 3.1. Identify specific and unique imaging signatures that distinguish patients with deficits in encoding, consolidation, and retrieval, respectively. Primary measures: structural measures of morphometry and white matter integrity (FA) and functional connectivity (cross correlation and total interdependence) in identified brain networks damaged in TBI.

Clinical Implications. This research has the potential to devise a method to match specific subcomponents of memory impairment to specifically targeted memory interventions, thus maximizing recovery of memory and function. The results of this investigation will be used to refine the interventions, to evaluate cognitive and functional endpoints, and to power a larger clinical trial that will yield data enabling clinicians to match TBI patients to effective treatments based on their individual profile of memory dysfunction.

Conditions

Traumatic Brain Injury

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

Memory Strategy Training

This arm involves intervention that teaches participants to use active encoding strategies to learn and remember new information.

Group Type: ACTIVE_COMPARATOR

Memory Strategy Training

Intervention Type: BEHAVIORAL

This intervention involves intervention that teaches participants to use active encoding strategies to learn and remember new information. The intervention will be implemented using verbal and face-name paired associate learning.

Errorless Learning

This arm involves intervention that enhances consolidation of correct target information by preventing false recall of incorrect information during the acquisition phase.

Group Type: ACTIVE_COMPARATOR

Errorless Learning

Intervention Type: BEHAVIORAL

This intervention enhances consolidation of correct target information by preventing false recall of incorrect information during the acquisition phase. Participants are encouraged to recall target information only if they are sure it is correct, thus eliminating errors. The intervention will be implemented using verbal and face-name paired associate learning.

Retrieval Practice

This arm involves intervention that enhances retrieval of correct target information by actively practicing retrieval in the presence of a cue.

Group Type: ACTIVE_COMPARATOR

Retrieval Practice

Intervention Type: BEHAVIORAL

This intervention enhances retrieval of correct target information by actively practicing retrieval in the presence of a cue. The intervention will be implemented using verbal and face-name paired associate learning.

Interventions

Memory Strategy Training

This intervention involves intervention that teaches participants to use active encoding strategies to learn and remember new information. The intervention will be implemented using verbal and face-name paired associate learning.

Intervention Type: BEHAVIORAL

Errorless Learning

This intervention enhances consolidation of correct target information by preventing false recall of incorrect information during the acquisition phase. Participants are encouraged to recall target information only if they are sure it is correct, thus eliminating errors. The intervention will be implemented using verbal and face-name paired associate learning.

Intervention Type: BEHAVIORAL

Retrieval Practice

This intervention enhances retrieval of correct target information by actively practicing retrieval in the presence of a cue. The intervention will be implemented using verbal and face-name paired associate learning.

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• Veterans aged 25-65 who are post-deployment,
• having served in Operation Iraqi Freedom (OIF), Operation Enduring Freedom (OEF), or Operation New Dawn (OND),
• who meet criteria for moderate or severe TBI during deployment,
• are eligible to participate.
• Patients will meet the 2007 VA/DoD criteria54,

• supplemented by data from the VA TBI Identification Semi-Structured Interview55.
• All patients will have gone through Level I and II assessments with positive findings.

• Moderate to Severe Traumatic Brain Injury (M-STBI) (blast and blunt),
• > 6 months post-injury,
• no receptive aphasia (impairing ability to comprehend task instructions),
• able to participate in return visits.

Exclusion Criteria

• No MRI contraindications,
• not claustrophobic,
• no current or past history of disabling Axis I psychiatric disorders (except for PTSD and depression),
• no active substance abuse,
• not pregnant.

• Minimum Eligible Age: 25 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Florida

OTHER

Sponsor Role: collaborator

VA Office of Research and Development

FED

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Russell M Bauer, PhD

Role: PRINCIPAL_INVESTIGATOR

North Florida/South Georgia Veterans Health System, Gainesville, FL

Locations

North Florida/South Georgia Veterans Health System, Gainesville, FL

Gainesville, Florida, United States

Countries

United States

Provided Documents

Document Type: Study Protocol

View Document

Document Type: Statistical Analysis Plan

View Document

Related Links

http://www.brrc.research.va.gov

Home page for the Gainesville VA Brain Rehabilitation Research Center of Excellence

Other Identifiers

1I21RX001730-01

Identifier Type: NIH

Identifier Source: secondary_id

View Link

N1730-P

Identifier Type: -

Identifier Source: org_study_id