Middle and long latency peak sources in auditory evoked magnetic fields for tone bursts in humans

• Published in: Neuroscience letters Vol. 293; no. 3; pp. 187 - 190
• Main Authors: Kanno, Akitake, Nakasato, Nobukazu, Murayama, Nobuki, Yoshimoto, Takashi
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 03.11.2000; Elsevier
• Subjects: Acoustic Stimulation; Adult; Aged; Auditory cortex; Auditory evoked response; Biological and medical sciences; Brain Mapping; Cerebral Cortex - physiology; Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation; Evoked Potentials, Auditory - physiology; Female; Functional Laterality - physiology; Fundamental and applied biological sciences. Psychology; Heschl's gyrus; Humans; Magnetoencephalography; Male; Middle Aged; N100m; P50m; Planum temporale; Reaction Time - physiology; Vertebrates: nervous system and sense organs; Heschl's gyrus; Magnetoencephalography; Auditory evoked response; P50m; N100m; Auditory cortex; Planum temporale; Human; Stimulus; Evoked magnetic field; Central nervous system; Auditory pathway; Brain (vertebrata)
• ISSN: 0304-3940; 1872-7972
• DOI: 10.1016/S0304-3940(00)01525-1

The relative position of the P50m and the N100m sources of the auditory evoked magnetic field remains unclear. Magnetoencephalography was performed in 24 normal subjects. Contralateral P50m to left and right ear stimulus was observed in 21 and 19 hemispheres, respectively. Ipsilateral P50m to left and right ear stimulus was observed in 17 and 16 hemispheres, respectively. N100m was observed in all subjects for all stimuli. Relative position of the equivalent current dipole of the P50m was 1.0±7.6 (mean±SD) mm posterior, 2.0±5.8 mm inferior and 1.8±8.0 mm medial to the N100m dipole position considering all observations. We suggest that the P50m and N100m sources are colocated in an extended area of the cortex.