Functional localization of bilateral auditory cortices using an MRI-linked whole head magnetoencephalography (MEG) system

Nakasato, Nobukazu; Fujita, Satoshi; Seki, Kazuhiko; Kawamura, Tomohiro; Matani, Ayumu; Tamura, I.; Fujiwara, Satoru; Yoshimoto, Takashi

doi:10.1016/0013-4694(94)00280-x

Cited by 121 publications

(55 citation statements)

References 21 publications

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“…The asymmetry displayed by control subjects is in line with findings of Reite et al (1989) and Nakasato et al (1995) of more anterior right and more posterior left hemispheric N100m sources, this asymmetry being larger in male subjects than in female subjects. However, both male and female patients in our study displayed more anterior left hemispheric sources, in contrast to the results of Reite et al (1999).…”

Section: Discussionsupporting

confidence: 86%

Altered hemispheric asymmetry of auditory magnetic fields to tones and syllables in schizophrenia

Rockstroh¹,

Kißler²,

Mohr³

et al. 2001

Biological Psychiatry

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Section: Discussionsupporting

confidence: 86%

Altered hemispheric asymmetry of auditory magnetic fields to tones and syllables in schizophrenia

Rockstroh¹,

Kißler²,

Mohr³

et al. 2001

Biological Psychiatry

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“…For example, right hemisphere N1m generators are of greater amplitude (Kanno et al, 1996) and cover a larger area (Zouridakis et al, 1998) in the auditory cortex than do left hemisphere N1m generators. In the present study, N1m source location was more anterior in the right than in the left hemisphere, which is in agreement with previous whole-head MEG studies (Mäkelä et al, 1993;Nakasato et al, 1995;Pantev et al, 1998). This observation can be explained by the fact that the left temporal plane of right-handed subjects is significantly more posterior than the right (Geschwind and Levitsky, 1968;Szikla et al, 1977).…”

Section: Differences Between Hemispheressupporting

confidence: 93%

Effect of stimulus frequency and stimulation site on the N1m response of the human auditory cortex

et al. 2004

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The aim of the present study was to investigate the functional organization of the auditory cortex for pure tones of 1, 2, 4, 6, 8 and 12 kHz. Ten subjects were tested with a whole-head magnetometer (151 channels). The location, latency and amplitude of the generators of the N1m (the main component of the response, peaking approximately at 100 ms) were explored simultaneously in the right and left hemispheres under monaural stimulation. Our results revealed that tonotopy is a rather complex functional organization of the auditory cortex. From 1 to 12 kHz, tonotopic maps were found for contralateral as well as for ipsilateral stimulation: N1m generators were found to be tonotopically organized mainly in an anterior-posterior direction in both hemispheres, whatever the stimulated ear, but also in an inferior-superior direction in the right hemisphere. Furthermore, latencies were longer in the left than in the right hemisphere. Two different representations of spectral distribution were found in the right auditory cortex: one for ipsilateral and one for contralateral stimulation.

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“…This study accepted only ECDs accounting for > 90% of the field variance and with confidence volume < 1 cm 3 . The single-ECD assumption is well known to account for the peak signals in previous MEG studies of SI response (Karhu et al 1991;Hari et al 1993;Kakigi 1994;Kawamura et al 1996;Nakasato et al 1996;Ohtomo et al 1996;Iwasaki et al 2001;Nagamatsu et al 2001;Nakahara et al 2004). Therefore, we used the single-ECD model for the hemispheric data contralateral to the stimulus side.…”

Section: Methodsmentioning

confidence: 99%

Neuromagnetic Evidence that Gingiva Area is Adjacent to Tongue Area in Human Primary Somatosensory Cortex

Murayama

Nakasato

Nakahara

et al. 2005

Tohoku J. Exp. Med.

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A. and ITOH, H. Neuromagnetic Evidence that Gingiva Area is Adjacent to Tongue Area in Human Primary Somatosensory Cortex. Tohoku J. Exp. Med., 2005, 207 (3), 191-196 The somatotopic organization of the human primary somatosensory (SI) area in the cerebral cortex has been intensively studied for the hand, lip, and tongue, but little is known about the gingiva. Penfield concluded that the gingival SI area was above the tongue area, as shown in his famous homunculus map. However, our recent study suggested that the lingual gingiva area was not so different to the tongue area. To delineate the fine SI somatotopy of the gingiva area, evoked magnetic fields were measured in 6 healthy subjects for the stimulus of the anterior or posterior and upper or lower parts of the lip, buccal and lingual gingiva, and tongue. Source position was estimated by a current dipole model at the first peak of the posterior-oriented current in a total of 12 cerebral hemispheres contralateral to the stimulation side. No significant difference was found between the positions of anterior and posterior or upper and lower parts of each structure. Both buccal and lingual gingiva areas were localized adjacent to the tongue area, but significantly lower than the lip area. We believe that the fine SI somatotopy of the human oral structures should be reconsidered.

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Functional localization of bilateral auditory cortices using an MRI-linked whole head magnetoencephalography (MEG) system

Cited by 121 publications

References 21 publications

Altered hemispheric asymmetry of auditory magnetic fields to tones and syllables in schizophrenia

Altered hemispheric asymmetry of auditory magnetic fields to tones and syllables in schizophrenia

Effect of stimulus frequency and stimulation site on the N1m response of the human auditory cortex

Neuromagnetic Evidence that Gingiva Area is Adjacent to Tongue Area in Human Primary Somatosensory Cortex

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