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@ARTICLE{Zimmermann:190166,
author = {Zimmermann, E. and Ostendorf, F. and Ploner, C. J. and
Lappe, M.},
title = {{I}mpairment of saccade adaptation in a patient with a
focal thalamic lesion},
journal = {Journal of neurophysiology},
volume = {113},
number = {7},
issn = {1522-1598},
address = {Bethesda, Md.},
publisher = {Soc.},
reportid = {FZJ-2015-03095},
pages = {2351 - 2359},
year = {2015},
abstract = {The frequent jumps of the eyeballs—called
saccades—imply the need for a constant correction of motor
errors. If systematic errors are detected in saccade
landing, the saccade amplitude adapts to compensate for the
error. In the laboratory, saccade adaptation can be studied
by displacing the saccade target. Functional selectivity of
adaptation for different saccade types suggests that
adaptation occurs at multiple sites in the oculomotor
system. Saccade motor learning might be the result of a
comparison between a prediction of the saccade landing
position and its actual postsaccadic location. To
investigate whether a thalamic feedback pathway might carry
such a prediction signal, we studied a patient with a lesion
in the posterior ventrolateral thalamic nucleus. Saccade
adaptation was tested for reactive saccades, which are
performed to suddenly appearing targets, and for scanning
saccades, which are performed to stationary targets. For
reactive saccades, we found a clear impairment in adaptation
retention ipsilateral to the lesioned side and a
larger-than-normal adaptation on the contralesional side.
For scanning saccades, adaptation was intact on both sides
and not different from the control group. Our results
provide the first lesion evidence that adaptation of
reactive and scanning saccades relies on distinct feedback
pathways from cerebellum to cortex. They further demonstrate
that saccade adaptation in humans is not restricted to the
cerebellum but also involves cortical areas. The
paradoxically strong adaptation for outward target steps can
be explained by stronger reliance on visual targeting errors
when prediction error signaling is impaired.},
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},
UT = {WOS:000355000900034},
pubmed = {pmid:25652924},
doi = {10.1152/jn.00744.2014},
url = {https://juser.fz-juelich.de/record/190166},
}