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@ARTICLE{Volz:866040,
author = {Volz, Lukas and Hamada, Masashi and Michely, Jochen and
Pool, Eva‐Maria and Nettekoven, Charlotte and Rothwell,
John C. and Grefkes‐Hermann, Christian},
title = {{M}odulation of {I}‐wave generating pathways by {TBS}: a
model of plasticity induction},
journal = {The journal of physiology},
volume = {597},
number = {24},
issn = {1469-7793},
address = {Hoboken, NJ},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2019-05286},
pages = {5963-5971},
year = {2019},
abstract = {Plasticity‐induction following theta burst transcranial
stimulation (TBS) varies considerably across subjects, and
the underlying neurophysiological mechanisms remain poorly
understood, representing a challenge for scientific and
clinical applications. In human motor cortex (M1),
recruitment of indirect waves (I‐waves) can be probed by
the excess latency of motor‐evoked potentials elicited by
transcranial magnetic stimulation with an
anterior–posterior (AP) orientation over the latency of
motor‐evoked potentials evoked by direct activation of
corticospinal axons using lateromedial (LM) stimulation,
referred to as the ‘AP‐LM latency’ difference.
Importantly, AP‐LM latency has been shown to predict
individual responses to TBS across subjects. We, therefore,
hypothesized that the plastic changes in corticospinal
excitability induced by TBS are the result, at least in
part, of changes in excitability of these same I‐wave
generating pathways. In 20 healthy subjects, we investigated
whether intermittent TBS (iTBS) modulates I‐wave
recruitment as reflected by changes in the AP‐LM latency.
As expected, we found that AP‐LM latencies before iTBS
were associated with iTBS‐induced excitability changes. A
novel finding was that iTBS reduced AP‐LM latency, and
that this reduction significantly correlated with changes in
cortical excitability observed following iTBS: subjects with
larger reductions in AP‐LM latencies featured larger
increases in cortical excitability following iTBS. Our
findings suggest that plasticity‐induction by iTBS may
derive from the modulation of I‐wave generating pathways
projecting onto M1, accounting for the predictive potential
of I‐wave recruitment. The excitability of I‐wave
generating pathways may serve a critical role in modulating
motor cortical excitability and hence represent a promising
target for novel repetitive transcranial magnetic
stimulation protocols.},
cin = {INM-3},
ddc = {610},
cid = {I:(DE-Juel1)INM-3-20090406},
pnm = {572 - (Dys-)function and Plasticity (POF3-572)},
pid = {G:(DE-HGF)POF3-572},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31647123},
UT = {WOS:000495881100001},
doi = {10.1113/JP278636},
url = {https://juser.fz-juelich.de/record/866040},
}