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Simultaneous TMS-fMRI of the Visual Cortex Reveals Functional Network, Even in Absence of Phosphene Sensation

Journal Article · · The Open Neuroimaging Journal
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [4]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Medical Dept.; Stony Brook Univ., NY (United States). SCAN Center; DOE/OSTI
  2. Stony Brook Univ., NY (United States). Dept. of Anesthesiology
  3. National Inst. on Alcohol Abuse and Alcoholism, Bethesda, MD (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Medical Dept.
  5. 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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Cited By (5)

Transcranial focused ultrasound stimulation of human primary visual cortex journal September 2016
Mapping the visual brain areas susceptible to phosphene induction through brain stimulation text January 2016
Is 1 Hz rTMS Always Inhibitory in Healthy Individuals? journal July 2012
Where Are the fMRI Correlates of Phosphene Perception? journal December 2018
Exploring Brain Circuitry: Simultaneous Application of Transcranial Magnetic Stimulation and Functional Magnetic Resonance Imaging book August 2010

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