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@ARTICLE{Alkhasli:865378,
author = {Alkhasli, Isabel and Sakreida, Katrin and Mottaghy, Felix
M. and Binkofski, Ferdinand},
title = {{M}odulation of {F}ronto-{S}triatal {F}unctional
{C}onnectivity {U}sing {T}ranscranial {M}agnetic
{S}timulation},
journal = {Frontiers in human neuroscience},
volume = {13},
issn = {1662-5161},
address = {Lausanne},
publisher = {Frontiers Research Foundation},
reportid = {FZJ-2019-04863},
pages = {190},
year = {2019},
abstract = {Background: The fronto-striatal network is involved in
various motor, cognitive, and emotional processes, such as
spatial attention, working memory, decision-making, and
emotion regulation. Intermittent theta burst transcranial
magnetic stimulation (iTBS) has been shown to modulate
functional connectivity of brain networks. Long stimulation
intervals, as well as high stimulation intensities are
typically applied in transcranial magnetic stimulation (TMS)
therapy for mood disorders. The role of stimulation
intensity on network function and homeostasis has not been
explored systematically yet.Objective: In this pilot study,
we aimed to modulate fronto-striatal connectivity by
applying iTBS at different intensities to the left
dorso-lateral prefrontal cortex (DLPFC). We measured
individual and group changes by comparing resting state
functional magnetic resonance imaging (rsfMRI) both pre-iTBS
and post-iTBS. Differential effects of individual sub- vs.
supra-resting motor-threshold stimulation intensities were
assessed.Methods: Sixteen healthy subjects underwent
excitatory iTBS at two intensities $[90\%$ and $120\%$ of
individual resting motor threshold (rMT)] on separate days.
Six-hundred pulses (2 s trains, 8 s pauses, duration of 3
min, 20 s) were applied over the left DLPFC. Directly before
and 7 min after stimulation, task-free rsfMRI sessions,
lasting 10 min each, were conducted. Individual seed-to-seed
functional connectivity changes were calculated for 10
fronto-striatal and amygdala regions of interest with the
SPM toolbox DPABI.Results: Sub-threshold-iTBS increased
functional connectivity directly between the left DLPFC and
the left and right caudate, respectively. Supra-threshold
stimulation did not change fronto-striatal functional
connectivity but increased functional connectivity between
the right amygdala and the right caudate.Conclusion: A short
iTBS protocol applied at sub-threshold intensities was not
only sufficient, but favorable, in order to increase
bilateral fronto-striatal functional connectivity, while
minimizing side effects. The absence of an increase in
functional connectivity after supra-threshold stimulation
was possibly caused by network homeostatic effects.},
cin = {INM-4 / JARA-BRAIN},
ddc = {610},
cid = {I:(DE-Juel1)INM-4-20090406 / $I:(DE-82)080010_20140620$},
pnm = {573 - Neuroimaging (POF3-573)},
pid = {G:(DE-HGF)POF3-573},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31263404},
UT = {WOS:000471593900001},
doi = {10.3389/fnhum.2019.00190},
url = {https://juser.fz-juelich.de/record/865378},
}