Auditory Magnetic Fields: Source Location and ‘Tonotopical Organization’ in the Right Hemisphere of the Human Brain

Elberling, Claus; Bak, C. K.; Kofoed, B.; Lebech, J.; Saermark, K.

doi:10.3109/01050398209076201

Cited by 112 publications

(43 citation statements)

References 13 publications

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“…This confirms previous results obtained by Elberling et al (1982), Romani et al (1982), Pantev et al (1988) and Yamamoto et al (1988), and it seems to be a reasonable value compared to the size of the area of the primary auditory cortex and integration region, which have a combined volume estimated to be approximately 2.5-3.5 cm 3 (Talairach and Tournoux 1988).…”

Section: Tonotopic Organization Of the Human Auditory Cortexsupporting

confidence: 77%

“…That tonotopic organization is maintained throughout the central auditory pathway, including the primary auditory cortex, is known not only from animal studies (Merzenich and Brugge 1973;Merzenich et al 1975Merzenich et al , 1976Schreiner 1991) but also from human studies (Elberling et al 1982;Romani et al 1982;Lauter et al 1985;Pantev et al 1988Pantev et al , 1989Pantev et al , 1991aYamamoto et al 1988;Bertrand et al 1991). The depth of the source of the MlOO component of the slow AEF indicates the tonotopic organization of the auditory cortex: the higher the stimulus frequency, the deeper the equivalent source of the MlOO component.…”

Section: * Corresponding Authormentioning

confidence: 99%

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The auditory evoked sustained field: origin and frequency dependence

Pantev

Eulitz

Elbert

et al. 1994

Electroencephalography and Clinical Neurophysiology

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SummaryA sound lasting for several seconds is known to elicit a basline shift in electrical and magnetic records. We have studied the dependence of the magnetic field distribution of this "per-stimulatory" sustained field (SF) on tone frequency. Tone bursts of 2 sec duration and 60 dB nHL intensity were presented to 11 subjects at varying interstimulus intervals between 5 and 7 sec. The carrier frequencies of 250, 1000 and 4000 Hz varied randomly from trial to trial. The field distributions obtained are consistent with the view that the auditory evoked sustained field activity originates in the supratemporal cortex. Differences in the locations of equivalent current dipoles of the SF from those of the MlOO wave of the slow auditory evoked field are consistent across subjects. The SF source locations corresponding to stimulus frequencies over an extended frequency range are arranged in a tonotopic manner and support the idea that the sources of the MlOO and the SF are current dipole sheets located on the superior surface of the primary auditory cortex.

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Section: Tonotopic Organization Of the Human Auditory Cortexsupporting

confidence: 77%

Section: * Corresponding Authormentioning

confidence: 99%

The auditory evoked sustained field: origin and frequency dependence

Pantev

Eulitz

Elbert

et al. 1994

Electroencephalography and Clinical Neurophysiology

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“…Several studies have suggested that N1m originates from HeschlÕs Gyrus (Elberling et al, 1982;Reite et al, 1994); but the secondary auditory areas in the supratemporal plane are another possibility (Pantev et al, 1995;Lütkenhö ner and Steinsträter, 1998). It would be useful to compare the location of these activation sites with cyto-architectonic data in order to assess whether frequency-dependent activated areas are located in the same physiologically defined field, which would reflect tonotopy, or in separate fields, which would not point to any tonotopic organization (Schö nwiesner et al, 2002).…”

Section: Tonotopic Organization Of the Auditory Cortexmentioning

confidence: 99%

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 procedure led to a model that was very similar to the initial one. Dipoles 1 and 2 are located in the superior temporal region, have a tangential orientation, and mainly reflect the activity of the primary auditory cortex (Elberling et al 1982;Hari et al 1980). Dipoles 3 and 4 are located in the lateral temporal lobe, have a radial orientation, and mainly reflect activity of the secondary auditory cortex (Arezzo et al 1975;Celesia 1976;Gallinat and Hegerl 1994;Scherg and von Cramon 1990).…”

Section: Dipole Source Analysismentioning

confidence: 99%