Nuyts, Marten and Beck, Mikkel Malling and Banach, Agata and Thielscher, Axel and Meesen, Raf and Tomasevic, Leo and Siebner, Hartwig Roman and Christiansen, Lasse (2025) Rostro-caudal TMS mapping of immediate transcranial evoked potentials reveals a pericentral crescendo-decrescendo pattern. NEUROIMAGE, 319: 121446. ISSN 1053-8119, 1095-9572
Full text not available from this repository. (Request a copy)Abstract
Background: We recently demonstrated that single-pulse TMS of the primary sensorimotor hand area (SM1HAND) elicits an immediate transcranial evoked potential (iTEP). This iTEP response appears within 2-8 ms post-TMS, featuring high-frequency peaks superimposed on a slow positive wave. Here, we used a linear TMS-EEG mapping approach to characterize the rostro-caudal iTEP expression and compared it to that of motor-evoked potentials (MEPs). Methods: In 15 healthy young volunteers (9 females), we identified the iTEP hotspot in left SM1HAND. We applied single biphasic TMS pulses at an intensity of 110 % of resting motor threshold over six cortical sites along a rostro-caudal axis (2 cm rostral to 3 cm caudal to the SM1HAND hotspot). We analyzed site-specific iTEP and MEP responses. Results: iTEP magnitude decreased rostrally and caudally from the SM1HAND hotspot. MEPs exhibited a similar rostro-caudal crescendo-decrescendo pattern. While iTEP and MEP response profiles were similar, normalized iTEP amplitudes decayed less rapidly at the first postcentral site. Discussion: These findings support the idea that pericentral iTEPs reflect a direct response signature of the pericentral cortex, possibly involving a synchronized TMS-induced excitation of cortical pyramidal tract neurons. Similar but non-identical rostro-caudal patterns suggest that iTEPs and MEPs may arise from overlapping but distinct neuronal populations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VENTRAL PREMOTOR CORTEX; MAGNETIC STIMULATION; MOTOR CORTEX; EEG; SINGLE; LOCALIZATION; RESPONSES; PULSES; Transcranial magnetic stimulation (TMS); Electroencephalography (EEG); TMS-EEG; Immediate transcranial evoked potential (iTEP) |
| Subjects: | 100 Philosophy & psychology > 150 Psychology 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Apr 2026 09:27 |
| Last Modified: | 17 Apr 2026 09:27 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67695 |
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