% IMPORTANT: The following is UTF-8 encoded. This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.
@PHDTHESIS{Wiesbrock:816407,
author = {Wiesbrock, Christopher},
othercontributors = {Kampa, Björn M. and Zimmer-Bensch, Geraldine Marion},
title = {{V}isual perception of artificial and nature-inspired
stimuli in an open-source python-based touchscreen chamber
for operant conditioning},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2021-03163},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2020},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2021; Dissertation, RWTH Aachen University, 2020},
abstract = {The visual system of the mouse is a long-standing component
of neuroscientific research. There is an ongoing discussion
about how to stimulate the visual system in a meaningful
way. Here, stimulation competes with artificial and
nature-inspired stimuli. The main difference is the
different degree of parameterization of the two stimulus
approaches. The more clearly the parameters are defined, the
more likely it is that the image statistics will be
associated with an experimental result. With the help of
so-called motion clouds, a stimulus has been created that is
able to reproduce natural image statistics while at the same
time providing a high degree of parameterization. In the
present thesis the motion clouds will be tested in a
behavioral experiment with mice with regard to the influence
of individual parameters. First, a test setup was developed
based on the principle of operant conditioning. This system,
the so-called touchscreen chamber, is a highly automated
tool for animal training. At the same time, the modular and
flexible hardware and software combination offers the
possibility to work with stimuli that can be freely
selected. A first test of the experimental setup was carried
out by experimentally verifying a test of the effect of
over-representation of neurons in the primary visual cortex
that respond to horizontal and vertical stimuli. This
circumstance is also related to the orientations in natural
photographs, which on average show an overrepresentation of
these orientations. In this thesis it could be shown that
this effect in mice leads to a better discrimination of
orientations when they are horizontal or vertical than when
they are in between. However, this effect could be
eliminated in the experiment by training the animals to
distinguish the underrepresented orientations from others.
In the next step the experimental concept was applied to the
nature-inspired motion clouds. It is assumed that the
processing in the cortex is based on parallel connected
sensory channels. Here, two experiments are presented in
which the animals learn to distinguish between two
differently oriented motion clouds, and the differentiation
of motion clouds with a different spatial frequency. It can
be shown that different bandwidths of the spatial frequency,
as it occurs in nature, do not influence the orientation
difference. In contrast, a higher bandwidth of orientations
in the stimulus leads to an improved discrimination of the
spatial frequency. This supports the hypothesis that several
activated sensory channels improve experimental performance.
Finally, the experiments, in particular the training program
and the orientation discrimination for the education of
biology students were modified and proved to be a sound
educational concept.},
cin = {162320 / 160000},
ddc = {570},
cid = {$I:(DE-82)162320_20140620$ / $I:(DE-82)160000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2021-03163},
url = {https://publications.rwth-aachen.de/record/816407},
}
Gast ::