Abstract
Repetitive transcranial magnetic stimulation (rTMS) appears capable of modulating human cortical excitability beyond the duration of the stimulation train. However, the basis and extent of this “off-line” modulation remains unknown. In a group of anesthetized cats, we applied patterns of real or sham focal rTMS to the visuo-parietal cortex (VP) at high (HF) or low (LF) frequency and recorded brain glucose uptake during (on-line), immediately after (off-line), or 1 h after (late) stimulation. During the on-line period LF and HF rTMS induced a significant relative reduction of 14C-2DG uptake in the stimulated VP cortex and tightly linked cortical and subcortical structures (e.g. the superficial superior colliculus, the pulvinar, and the LPl nucleus) with respect to homologue areas in the unstimulated hemisphere. During the off-line period HF rTMS induced a significant relative increase in 14C-2DG uptake in the targeted VP cortex, whereas LF rTMS generated the opposite effect, with only mild network impact. Moderate distributed effects were only recorded after LF rTMS in the posterior thalamic structures. No long lasting cortical or subcortical effects were detected during the late period. Our findings demonstrate opposite modulation of rTMS on local and distant effects along a specific network, depending on the pattern of stimulation. Such effects are demonstrated in the anesthetized animal, ruling out behavioral and non-specific reasons for the differential impact of the stimulation. The findings are consistent with previous differential electrophysiological and behavioral effects of low and high frequency rTMS patterns and provide support to uses of rTMS in neuromodulation.
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Acknowledgments
We are extremely grateful to Dr. Jarrett Rushmore for methodological assistance and fruitful discussions. Supported in part by the National Institutes of Health (NS32137, NS33975 and NS47754 to BRP/MM/AV-C). AV-C was also supported by grants from ‘La Caixa’ (Spain) and the Spanish Ministry of Education, Culture and Sports EX2002-041).
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†Prof. Payne passed away in May 2004. This article is submitted in his memory.
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Valero-Cabré, A., Payne, B.R. & Pascual-Leone, A. Opposite impact on 14C-2-deoxyglucose brain metabolism following patterns of high and low frequency repetitive transcranial magnetic stimulation in the posterior parietal cortex. Exp Brain Res 176, 603–615 (2007). https://doi.org/10.1007/s00221-006-0639-8
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DOI: https://doi.org/10.1007/s00221-006-0639-8