Simultaneous TMS-fMRI of the Visual Cortex Reveals Functional Network, Even in Absence of Phosphene Sensation
Journal Article
·
· The Open Neuroimaging Journal
- Brookhaven National Lab. (BNL), Upton, NY (United States). Medical Dept.; Stony Brook Univ., NY (United States). SCAN Center; DOE/OSTI
- Stony Brook Univ., NY (United States). Dept. of Anesthesiology
- National Inst. on Alcohol Abuse and Alcoholism, Bethesda, MD (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Medical Dept.
- St. Charles Hospital, Port Jefferson, NY (United States); National Inst. on Alcohol Abuse and Alcoholism, Bethesda, MD (United States)
Phosphene sensation is commonly used to measure cortical excitability during transcranial magnetic stimulation (TMS) of the occipital cortex. However, some individuals lack this perception, and the reason for it is still unknown. In this work, we used functional magnetic resonance imaging (fMRI) to detect brain activation during local TMS of the occipital cortex in twelve healthy subjects. We found that TMS modulated brain activity in areas connected to the stimulation site, even in people unable to see phosphene. However, we observed a trend for a lower bloodoxygenation-level dependent (BOLD) signal, and smaller brain-activation clusters near the stimulated site than in the interconnected brain areas, suggesting that TMS pulse is more effective downstream than at its application site. Furthermore, we noted prominent differences in brain activation/deactivation patterns between subjects who perceived phosphene and those who did not, implying a functional distinction in their neuronal networks that might explain the origin of differences in phosphene generation.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
- Grant/Contract Number:
- AC02-98CH10886
- OSTI ID:
- 1629133
- Journal Information:
- The Open Neuroimaging Journal, Journal Name: The Open Neuroimaging Journal Vol. 4; ISSN 1874-4400
- Publisher:
- Bentham OpenCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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