Targeting the parahippocampal area by auditory cortex stimulation in tinnitus.

Abstract:

BACKGROUND:The final common pathway in tinnitus generation is considered to be synchronized auditory oscillatory hyperactivity. Intracranial auditory cortex stimulation (iACS) via implanted electrodes has been developed to treat severe cases of intractable tinnitus targeting this final common pathway, in the hope of being a panacea for tinnitus. However, not everybody responds to this treatment. OBJECTIVE:The electrical brain activity and functional connectivity at rest might determine who is going to respond or not to iACS and might shed light on the pathophysiology of auditory phantom sound generation. METHOD:The resting state electrical brain activity of 5 patients who responded and 5 patients who did not respond to auditory cortex implantation are compared using source localized spectral activity (Z-score of log transformed current density) and lagged phase synchronization. RESULTS:sLORETA source localization reveals significant differences between responders vs non-responders for beta3 in left posterior parahippocampal, hippocampal and amygdala area extending into left insula. Gamma band differences exist in the posterior parahippocampal areas and BA10. Functional connectivity between the auditory cortex and the hippocampal area is increased for beta2, delta and theta2 in responders, as well as between the parahippocampal area and auditory cortex for beta3. CONCLUSION:The resting state functional connectivity and activity between the auditory cortex and parahippocampus might determine whether a tinnitus patient will respond to a cortical implant. The auditory cortex may only be a functional entrance into a larger parahippocampal based tinnitus network.

journal_name

Brain Stimul

journal_title

Brain stimulation

authors

De Ridder D,Vanneste S

doi

10.1016/j.brs.2014.04.004

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

709-17

issue

5

eissn

1935-861X

issn

1876-4754

pii

S1935-861X(14)00163-6

journal_volume

7

pub_type

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