title: A novel approach for documenting naming errors induced by navigated transcranial magnetic stimulation.
abstract: Transcranial magnetic stimulation (TMS) is widely used both in basic research and in clinical practice. TMS has been utilized in studies of functional organization of speech in healthy volunteers. Navigated TMS (nTMS) allows preoperative mapping of the motor cortex for surgical planning. Recording behavioral responses to nTMS in the speech-related cortical network in a manner that allows off-line review of performance might increase utility of nTMS both for scientific and clinical purposes, e.g., for a careful preoperative planning. Four subjects participated in the study. The subjects named pictures of objects presented every 2-3s on a computer screen. One-second trains of 5 pulses were applied by nTMS 300ms after the presentation of pictures. The nTMS and stimulus presentation screens were cloned. A commercial digital camera was utilized to record the subject's performance and the screen clones. Delays between presentation, audio and video signals were eliminated by carefully tested combination of displays and camera. An experienced neuropsychologist studied the videos and classified the errors evoked by nTMS during the object naming. Complete anomias, semantic, phonological and performance errors were observed during nTMS of left fronto-parieto-temporal cortical regions. Several errors were detected only in the video classification. nTMS combined with synchronized video recording provides an accurate monitoring tool of behavioral TMS experiments. This experimental setup can be particularly useful for high-quality cognitive paradigms and for clinical purposes.
authors: BioMag Laboratory, HUSLAB, Hospital District of Helsinki and Uusimaa, P.O. Box 340, FI-00029 HUS, Helsinki, Finland. plioumis@cc.hut.fi
authors: Pantelis
authors: P
authors: Lioumis
authors: Andrey
authors: A
authors: Zhdanov
authors: Niko
authors: N
authors: Mäkelä
authors: Henri
authors: H
authors: Lehtinen
authors: Juha
authors: J
authors: Wilenius
authors: Tuomas
authors: T
authors: Neuvonen
authors: Henri
authors: H
authors: Hannula
authors: Vedran
authors: V
authors: Deletis
authors: Thomas
authors: T
authors: Picht
authors: Jyrki P
authors: JP
authors: Mäkelä
mesh_terms: D000328:Adult; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007802:Language; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009275:Names; D009483:Neuropsychological Tests; D010775:Photic Stimulation / Q000379:methods; D013997:Time Factors; D050781:Transcranial Magnetic Stimulation / Q000009:adverse effects*; D055815:Young Adult