Erratum to: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared. In: Frontiers in computational neuroscience 6 (2012), 2

Tzvetanov, Tzvetomir

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Tzvetomir Tzvetanov

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Erratum: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared

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A Single Theoretical Framework for Circular Features Processing in Humans: Orientation and Direction of Motion Compared

Common computational principles underly processing of various visual features in the cortex. They are considered to create similar patterns of contextual modulations in behavioral studies for different features as orientation and direction of motion. Here, I studied the possibility that a single theoretical framework, implemented in different visual areas, of circular feature coding and processing could explain these similarities in observations. Stimuli were created that allowed direct comparison of the contextual effects on orientation and motion direction with two different psychophysical probes: changes in weak and strong signal perception. One unique simplified theoretical model of circular feature coding including only inhibitory interactions, and decoding through standard vector average, successfully predicted the similarities in the two domains, while different feature population characteristics explained well the differences in modulation on both experimental probes. These results demonstrate how a single computational principle underlies processing of various features across the cortices

Tzvetomir eTzvetanov

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A single theoretical framework for circular features processing in humans: orientation and direction of motion compared

GENERAL COMMENTARY
published: 04 April 2013
doi: 10.3389/fncom.2013.00028
Erratum: A single theoretical framework for circular
features processing in humans: orientation and direction
of motion compared
Tzvetomir Tzvetanov*
Institut für Informationsverarbeitung, Leibniz Universität Hannover, Hannover, Germany
*Correspondence: tzvetomir.tzvetanov@gmail.com
Edited by:
David Hansel, University of Paris, France
A commentary on
A single theoretical framework for
circular features processing in humans:
orientation and direction of motion
compared
by Tzvetanov, T. (2012). Front. Comput.
Neurosci. 6:28. doi: 10.3389/fncom.2012.
00028
In the article A single theoretical frame-
work for circular features processing
in humans: orientation and direction
of motion compared (Tzvetanov, 2012,
Front. Comput. Neurosci. 6:28. doi:
10.3389/fncom.2012.00028) a presentation
error occurred concerning the equa-
tions defining a and w within the text
(subsection 4.4, page 9).
The sentence on page 9, subsection 4.4:
The priors on the three parameters
were: l - beta probability distribution
with parameters Beta (1.1, 20);
μ - normal probability distribution
with parameters Norm (a, 10w) with
a and w being the mean and standard
deviation obtained from each exper-
imental data set {xi, pi} (a =∑ pixi
and w = √∑ pi(xi − a)2); σ - gamma
probability distribution with parame-
ters Gamma (aG, bG) fixed at aG = 1 +
w/bG and bG = (
√
5 − 1)w/2 such that
the mode and variance of the Gamma
distribution is w.
must be replaced by:
The priors on the three parameters
were: l - beta probability distribution
with parameters Beta (1.1, 20); μ -
normal probability distribution with
parameters Norm (a, 10w) with a andw
being the mean and standard deviation
obtained from each experimental
data set {xi, ni, yi} as follows: a =∑
qixi, w =
√∑
qi(xi − a)2, and
qi = ni/∑i ni; σ - gamma probability
distribution with parameters Gamma
(aG, bG) fixed at aG = 1 + w/bG and
bG = (
√
5 − 1)w/2 such that the
mode and variance of the Gamma
distribution is w.
ACKNOWLEDGMENTS
During this project the author
was supported by the Deutsche
Forschungsgemeinschaft (grant number
TZ 69/1-1).
Received: 26 February 2013; accepted: 18 March 2013;
published online: 04 April 2013.
Citation: Tzvetanov T (2013) Erratum: A single the-
oretical framework for circular features processing in
humans: orientation and direction of motion compared.
Front. Comput. Neurosci. 7:28. doi: 10.3389/fncom.
2013.00028
Copyright © 2013 Tzvetanov. This is an open-access
article distributed under the terms of the Creative
Commons Attribution License, which permits use, dis-
tribution and reproduction in other forums, provided
the original authors and source are credited and sub-
ject to any copyright notices concerning any third-party
graphics etc.
Frontiers in Computational Neuroscience www.frontiersin.org April 2013 | Volume 7 | Article 28 | 1
COMPUTATIONAL NEUROSCIENCE


Common computational principles underlie processing of various visual features in the cortex. They are considered to create similar patterns of contextual modulations in behavioral studies for different features as orientation and direction of motion. Here, I studied the possibility that a single theoretical framework, implemented in different visual areas, of circular feature coding and processing could explain these similarities in observations. Stimuli were created that allowed direct comparison of the contextual effects on orientation and motion direction with two different psychophysical probes: changes in weak and strong signal perception. One unique simplified theoretical model of circular feature coding including only inhibitory interactions, and decoding through standard vector average, successfully predicted the similarities in the two domains, while different feature population characteristics explained well the differences in modulation on both experimental probes. These results demonstrate how a single computational principle underlies processing of various features across the cortices.DFG/TZ 69/1-

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Erratum: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared (vol 6, pg 28, 2012)

Erratum: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared (vol 6, pg 28, 2012)

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