Human second somatosensory area: subdural and magnetoencephalographic recording of somatosensory evoked responses. Issue 4 (1st October 1997)

• Record Type: Journal Article
• Authors: Mima, Tatsuya; Ikeda, Akio; Nagamine, Takashi; Yazawa, Shogo; Kunieda, Takeharu; Mikuni, Nobuhiro; Taki, Waro; Kimura, Jun; Shibasaki, Hiroshi
• Is Part Of: Journal of neurology, neurosurgery and psychiatry. Volume 63:Issue 4(1997)
• Page Start: 501
• Page End: 505
• Publication Date: 1997-10-01
• Subjects: somatosensory evoked potentials -- subdural recording -- magnetoencephalography -- human second somatosensory area; Neurology -- Periodicals; Nervous system -- Surgery -- Periodicals; Psychiatry -- Periodicals; 616.8
• DOI: 10.1136/jnnp.63.4.501
• Languages: English
• ISSNs: 0022-3050

Abstract

Abstract : OBJECTIVE: To investigate somesthetic functions of the perisylvian cortex. Methods —Somatosensory evoked magnetic fields (SEFs) and somatosensory evoked potentials (SEPs) of the perisylvian cortex were recorded directly from subdural electrodes in a patient with a left frontal brain tumour. RESULTS: The most prominent SEP components after electrical stimulation of the right and left hands and the right foot were double peaked negativity recorded just above the sylvian fissure (latency 80 to 150 ms), respectively (N1a and N1b). Generator sources for the magnetoencephalographic counterparts of those peaks (N1a(m) and N1b(m)) were both localised at the upper bank of the sylvian fissure, and those of N1a(m) were more anteromedially located than those of N1b(m). CONCLUSIONS: These findings suggest the existence of at least two separate somatosensory areas within the human perisylvian cortex.