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A Protocol for the Administration of Real-Time fMRI Neurofeedback Training
Published on: August 24, 2017
Real time functional MRI training to decrease motion in imaging studies: Lack of significant improvement
Tessy M Lal1, Philip R Baldwin1,2, Ming-Bo Cai3
1Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, Texas.
Abstract:
Functional magnetic resonance imaging (fMRI) is widely used to study brain circuitry in healthy controls and in psychiatry. A major problem of fMRI studies is motion, which affects the quality of images, is a major source of noise, and can confound data if, for example, the experimental groups move differently. Despite continual reminders to experimental subjects about keeping still, however, movement in the scanner remains a problem. The authors hypothesized that showing head movement during a scanning session may help subjects learn how to keep their head still. The authors scanned subjects and displayed in real time a plot of head movement that had three regions. The authors found, in a limited sample, that the improvements were marginal and inconsistent. Thus, they concluded that this strategy, even if likely to work for some people, is probably not sufficiently successful to be implemented at this time.
Insights
Providing real-time head movement feedback during functional magnetic resonance imaging (fMRI) scans yielded marginal improvements in subject stillness. This strategy, while potentially helpful for some, is not yet sufficiently successful for widespread implementation in brain imaging research.
Area of Science:
- Neuroimaging
- Cognitive Neuroscience
- Psychiatric Research
Background:
- Functional magnetic resonance imaging (fMRI) is crucial for studying brain function in health and disease.
- Head motion during fMRI scans is a significant source of image artifacts and data confounding.
- Reducing subject movement in the MRI scanner remains a persistent challenge in neuroimaging research.
Purpose of the Study:
- To investigate the efficacy of real-time head motion feedback as a strategy to improve subject stillness during fMRI.
- To determine if visual feedback of movement can train subjects to reduce motion during scanning.
Main Methods:
- Participants underwent fMRI scanning while a real-time plot of their head movement was displayed.
- The feedback plot featured three distinct regions to guide subjects on their movement levels.
- Data analysis focused on the degree of motion reduction achieved with the feedback intervention.
Main Results:
- The real-time feedback intervention resulted in marginal and inconsistent improvements in head stillness.
- The observed benefits varied among participants, indicating limited generalizability.
- The strategy did not prove sufficiently effective in the tested sample to warrant immediate adoption.
Conclusions:
- Real-time visual feedback of head motion is not currently a sufficiently effective method to significantly reduce motion in fMRI studies.
- Further research may be needed to refine feedback strategies or explore alternative motion reduction techniques.
- Motion artifacts continue to pose a challenge for reliable fMRI data acquisition, particularly in clinical populations.
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