17 August 2017 Evaluation of evoked responses to pulse-matched high frequency and intermittent theta burst transcranial magnetic stimulation using simultaneous functional near-infrared spectroscopy
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Abstract
Transcranial magnetic stimulation (TMS) is a noninvasive method used to excite or inhibit cortical activity for experimental, diagnostic, and therapeutic interventions. However, nonmotor regions of the brain targeted in TMS therapies, such as the dorsolateral prefrontal cortex (DLPFC), offer no extrinsic response to stimulation, resulting in a need for a practical method for the evaluation of treatment. We sought to determine the capability of a continuous-wave light emitting diodes (LED)-based functional near-infrared spectroscopy (fNIRS) system to measure evoked cortical hemoglobin changes in the DLPFC during the simultaneous application of TMS to the left-DLPFC under brief stimulation paradigms used in the clinic. Seventeen healthy participants received short TMS trains at F3 in four different stimulation conditions (single pulse, high frequency, intermittent theta burst, and sham) while adjacent fNIRS measurements were recorded. Ten 2-s trains of each stimulation type were delivered with an intertrial interval of 40 s. Results indicated that high-frequency stimulation produces a larger and more evident response than other measured conditions. These findings show that a continuous-wave LED-based fNIRS system can be used to measure TMS-evoked responses and that future TMS applications can benefit from concurrent assessment of localized cortical activation changes.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Adrian Curtin, Adrian Curtin, Junfeng Sun, Junfeng Sun, Hasan Ayaz, Hasan Ayaz, ZhenYing Qian, ZhenYing Qian, Banu K. Onaral, Banu K. Onaral, Jijun Wang, Jijun Wang, Shanbao Tong, Shanbao Tong, } "Evaluation of evoked responses to pulse-matched high frequency and intermittent theta burst transcranial magnetic stimulation using simultaneous functional near-infrared spectroscopy," Neurophotonics 4(4), 041405 (17 August 2017). https://doi.org/10.1117/1.NPh.4.4.041405 . Submission: Received: 1 April 2017; Accepted: 7 July 2017
Received: 1 April 2017; Accepted: 7 July 2017; Published: 17 August 2017
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