Clinical trial NCT04268186: TDCS to Improve Motivation and Memory in Elderly (TIME)
Official title: Noninvasive Brain Stimulation as a Tool to Study the Role of Motivation in Age-related Cognitive Abilities
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Motivation
Keywords: cognitive functioning
elderly
healthy
tDCS
motivation
memory
structural MRI
resting-state fMRI
Lead sponsor: Northeastern University
Sponsor class: OTHER
Collaborators: name: Massachusetts General Hospital
name: National Institute on Aging (NIA)
First posted: 2020-02-13
Enrollment: 72
Sex: ALL
Minimum age (years): 65
Maximum age (years): 80
Standard ages: OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: BASIC_SCIENCE

Brief summary: Fundamental advancements in understanding successful aging are limited by the lack of causal, rather than just correlational methods to connect age-related changes in memory ability to changes in brain structure and function. In this study, non-invasive electric brain stimulation will be used as a tool to create causal links between successful memory function in aging and brain structures associated with motivation. Recently, it was shown that a group of elderly, dubbed "superagers", are indistinguishable from young adults in memory performance and the structure of cortical limbic regions. A key superaging region is mid-cingulate cortex (MCC), a brain structure associated with motivation and tenacity. The MCC is a hub region that synchronizes information flow between three core brain networks. The goal of the research is to explore the contribution of motivation to memory performance by modulating MCC connectivity with transcranial direct current stimulation (tDCS) to provide the first causal evidence that experimentally induced motivation can improve memory performance. Since MCC has not been stimulated with tDCS before, we will test three different stimulation protocols and compare against a placebo. The stimulation protocols were computationally optimized for this project. The primary aim is to find the stimulation protocol most successful at improving memory performance. In order to elucidate the mechanisms behind these changes, effects of stimulation on motivation and network connectivity will be investigated. If indeed memory can be improved by increasing motivation and effort via stimulating MCC, this study will generate new insights into the motivational mechanisms of successful aging.


Eligibility criteria: Inclusion Criteria:

* between the ages of 65 and 80
* normal or corrected to normal vision
* fluent in speaking, reading and understanding English
* right-handed

Exclusion Criteria:

* any metal implants that may cause harm through MRI scanning
* other metals that may interfere with obtaining MRI signals
* claustrophobic
* pregnancy
* history of neurological or psychiatric illnesses
* history of fainting, seizures or epilepsy
* history of migraines
* history of drug abuse
* learning disability
* intracranial lesion
* any prescription or regular medication except for birth control
* any uncontrolled medical condition
* skin disease or damage on scalp
* hair style or head dress that prevents electrode contact with the scalp
* any condition affecting agility of hands (e.g. acute or chronic tenosynovitis, active joint deformity of arthritic origin)

Primary outcomes:
measure: Change in "Feeling of difficulty" from baseline
timeFrame: 1 week
measure: Change in "Estimates of effort" from baseline
timeFrame: 1 week
measure: Change in "NASA Task Load Index" from baseline
timeFrame: 1 week
measure: Change in "Time to complete unsolvable anagrams" from baseline
timeFrame: 1 week
Secondary outcomes:
measure: Change in "Memory recognition discriminability (d')" from baseline
timeFrame: 1 week
measure: Change in "Intrinsic functional connectivity strength" from baseline
timeFrame: 1 week
measure: Change in "California Verbal Learning Test" score from baseline
timeFrame: 1 week
Other outcomes:
Locations:
city: Boston
country: United States
facility: Northeastern University
state: Massachusetts
Study officials:
affiliation: Northeastern University
name: Sumientra M Rampersad, PhD
role: PRINCIPAL_INVESTIGATOR
References: