Jos J. Eggermont
- Published in print:
- 2012
- Published Online:
- September 2012
- ISBN:
- 9780199605606
- eISBN:
- 9780191741555
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199605606.003.0004
- Subject:
- Neuroscience, Sensory and Motor Systems, Development
In patients with tinnitus, structural and functional brain imaging combined with electro- and magnetoencephalograms have suggested correlations between aspects of tinnitus and brain functioning. ...
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In patients with tinnitus, structural and functional brain imaging combined with electro- and magnetoencephalograms have suggested correlations between aspects of tinnitus and brain functioning. Participating brain regions are among others in the auditory cortex, in the limbic system and in the cerebellum. Spontaneous EEG and MEG points to a reduction of alpha-band activity and an increase in delta- and gamma-band activity. The strength of the latter appears to correlate well with tinnitus loudness, whereas that of the alpha- and delta-band relates more to the level of annoyance caused by the tinnitus. The clear changes in spontaneous synchrony in the MEG activity between different neocortical areas in tinnitus patients also suggest wide involvement of brain areas in this disorder.Less
In patients with tinnitus, structural and functional brain imaging combined with electro- and magnetoencephalograms have suggested correlations between aspects of tinnitus and brain functioning. Participating brain regions are among others in the auditory cortex, in the limbic system and in the cerebellum. Spontaneous EEG and MEG points to a reduction of alpha-band activity and an increase in delta- and gamma-band activity. The strength of the latter appears to correlate well with tinnitus loudness, whereas that of the alpha- and delta-band relates more to the level of annoyance caused by the tinnitus. The clear changes in spontaneous synchrony in the MEG activity between different neocortical areas in tinnitus patients also suggest wide involvement of brain areas in this disorder.
Catherine LiéGeois-Chauvel, Kimberly Giraud, Jean-Michel Badier, Patrick Marquis, and Patrick Chauvel
- Published in print:
- 2003
- Published Online:
- March 2012
- ISBN:
- 9780198525202
- eISBN:
- 9780191689314
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780198525202.003.0010
- Subject:
- Psychology, Music Psychology
This chapter examines the tonotopic organization of the human auditory cortex using intracerebrally recorded evoked potentials studied as a function of the anatomical recording site. The sensitivity ...
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This chapter examines the tonotopic organization of the human auditory cortex using intracerebrally recorded evoked potentials studied as a function of the anatomical recording site. The sensitivity of a neuronal population to a given frequency is determined from fluctuations in auditory evoked potential (AEP) amplitude between different recording sites in the primary auditory cortex and surrounding secondary areas like the planum temporale. The chapter particularly explores the tonotopic organization of the human auditory cortex in both cerebral hemispheres. In the right hemisphere, clear spectrally organized tonotopic maps wre observed with distinct separations between different frequency-processing regions. AEPs for high frequencies were recorded medially, whereas AEPs for low frequencies were recorded laterally. However, in the left hemisphere, this tonotopic organization was less evident, with different regions involved in the processing of a range of frequencies. The hemisphere-related difference in the processing of tonal frequency is discussed in relation to pitch perception.Less
This chapter examines the tonotopic organization of the human auditory cortex using intracerebrally recorded evoked potentials studied as a function of the anatomical recording site. The sensitivity of a neuronal population to a given frequency is determined from fluctuations in auditory evoked potential (AEP) amplitude between different recording sites in the primary auditory cortex and surrounding secondary areas like the planum temporale. The chapter particularly explores the tonotopic organization of the human auditory cortex in both cerebral hemispheres. In the right hemisphere, clear spectrally organized tonotopic maps wre observed with distinct separations between different frequency-processing regions. AEPs for high frequencies were recorded medially, whereas AEPs for low frequencies were recorded laterally. However, in the left hemisphere, this tonotopic organization was less evident, with different regions involved in the processing of a range of frequencies. The hemisphere-related difference in the processing of tonal frequency is discussed in relation to pitch perception.
