Abstract
Concerning calculation function, studies have already reported on localizing computational function in patients and volunteers by functional magnetic resonance imaging and transcranial magnetic stimulation. However, the development of accurate repetitive navigated TMS (rTMS) with a considerably higher spatial resolution opens a new field in cognitive neuroscience. This study was therefore designed to evaluate the feasibility of rTMS for locating cortical calculation function in healthy volunteers, and to establish this technique for future scientific applications as well as preoperative mapping in brain tumor patients. Twenty healthy subjects underwent rTMS calculation mapping using 5 Hz/10 pulses. Fifty-two previously determined cortical spots of the whole hemispheres were stimulated on both sides. The subjects were instructed to perform the calculation task composed of 80 simple arithmetic operations while rTMS pulses were applied. The highest error rate (80 %) for all errors of all subjects was observed in the right ventral precentral gyrus. Concerning division task, a 45 % error rate was achieved in the left middle frontal gyrus. The subtraction task showed its highest error rate (40 %) in the right angular gyrus (anG). In the addition task a 35 % error rate was observed in the left anterior superior temporal gyrus. Lastly, the multiplication task induced a maximum error rate of 30 % in the left anG. rTMS seems feasible as a way to locate cortical calculation function. Besides language function, the cortical localizations are well in accordance with the current literature for other modalities or lesion studies.
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Abbreviations
- aMTG:
-
Anterior middle temporal gyrus
- anG:
-
Angular gyrus
- ANOVA:
-
Analysis of variance
- aSTG:
-
Anterior superior temporal gyrus
- BOLD-fMRI:
-
Blood oxygen level dependent functional magnetic resonance imaging
- CI:
-
Confidence intervals
- CPS:
-
Cortical parcellation system
- DCS:
-
Direct cortical stimulation
- EMG:
-
Electromyogram
- fMRI:
-
Functional magnetic resonance imaging
- hIPS:
-
Horizontal segment of the IPS
- IPI:
-
Inter-picture interval
- IPS:
-
Intraparietal sulcus
- ITG:
-
Inferior temporal gyrus
- MEP:
-
Motor evoked potential
- MFG:
-
Middle frontal gyrus
- mMFG:
-
Middle middle frontal gyrus
- nTMS:
-
Navigated transcranial magnetic stimulation
- oplFG:
-
Opercular inferior frontal gyrus
- OR:
-
Odds ratio
- orIFG:
-
Orbital part of the inferior frontal gyrus
- pMFG:
-
Posterior middle frontal gyrus
- pMTG:
-
Posterior middle temporal gyrus
- polIFG:
-
Polar inferior frontal gyrus
- polMFG:
-
Polar middle frontal gyrus
- polSFG:
-
Polar superior frontal gyrus
- polSTG:
-
Polar superior temporal gyrus
- PSPL:
-
Posterior superior parietal lobule
- pSTG:
-
Posterior superior temporal gyrus
- PTI:
-
Picture-to-trigger interval
- rMT:
-
Resting motor threshold
- rTMS:
-
Repetitive navigated transcranial magnetic stimulation
- TMS:
-
Transcranial magnetic stimulation
- VAS:
-
Visual analogue scale
- vPrG:
-
Ventral precentral gyrus
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S.K. is a consultant for BrainLAB AG (Feldkirchen, Germany). All other authors declare that they have no conflict of interest concerning this current study. The study was completely financed by institutional grants of the Department of Neurosurgery and the Section of Neuroradiology. The authors report no conflict of interest affecting the materials or methods used in this study or the findings specified in this paper.
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Maurer, S., Tanigawa, N., Sollmann, N. et al. Non-invasive mapping of calculation function by repetitive navigated transcranial magnetic stimulation. Brain Struct Funct 221, 3927–3947 (2016). https://doi.org/10.1007/s00429-015-1136-2
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DOI: https://doi.org/10.1007/s00429-015-1136-2