1. A near infra-red spectroscopy study of the effects of pre-frontal single and paired pulse transcranial magnetic stimulation
- Author
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Thomson, Richard H., Daskalakis, Zafiris J., and Fitzgerald, Paul B.
- Subjects
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INFRARED spectroscopy , *PREFRONTAL cortex , *TRANSCRANIAL magnetic stimulation , *BRAIN stimulation , *CEREBRAL circulation , *OXYGEN consumption , *NEUROSCIENCES - Abstract
Abstract: Objective: Concentration changes in hemoglobin following single and paired pulse (2 and 15ms inter-stimulus interval) transcranial magnetic stimulation (TMS) was investigated using near infra-red spectroscopy (NIRS). Methods: TMS was delivered to left pre-frontal cortex at typical intensities used in neuroscience research and concentrations of deoxyhemoglobin (Hb), oxyhemoglobin (HbO) and total hemoglobin (HbT) were measured. Results: Significant drops in concentration of HbO and HbT were observed and while there was no effect of the different pulse types on amplitude, there was a difference in the time taken to return to baseline. Conclusions: The changes observed imply that in pre-frontal cortex, the different TMS pulse types result in differential effects on oxygen consumption. Significance: This study aids our understanding of the physiological effects of single and paired pulse TMS. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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