Binocular receptive field and responses to random-dot stereogram of a complex cell based on disparity energy model

Detail

Language

English

Title

Binocular receptive field and responses to random-dot stereogram of a complex cell based on disparity energy model

Free Keywords

Disparity Energy Model, binocular receptive field, random-dot stereogram, stereopsis

Description

Last Modified Date

Feb 29, 2008 13:56:35

Created Date

Feb 28, 2008 15:08:39

Contributor

Izumi OHZAWA (ohzawa)

Item Type

Model

Change Log(History)

Feb 29, 2008	Modified; Related to.
Feb 28, 2008	Modified; Index.
Feb 28, 2008	Modified; Index.

Model type

Matlab

Creator

Kota S. Sasaki

Izumi Ohzawa

Preview


Random-dot stereogram	Binocular receptive field of a complex cell	Disparity detection by disparity energy model

Model file

DisparityEnergy.zip

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Size	: 222.1 KB
Last updated	: Feb 28, 2008
Downloads	: 88

Total downloads since Feb 28, 2008 : 88

Readme

README.txt

Binocular receptive field and responses to random-dot stereogram of a complex cell based on disparity energy model

Authors: Kota S. Sasaki and Izumi Ohzawa
Graduate School of Frontier Biosciences, Osaka University
kota@fbs.osaka-u.ac.jp, ohzawa@fbs.osaka-u.ac.jp

License: BSD license, http://creativecommons.org/licenses/BSD/

Date: 2007-12-20

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RDSscript.m:

This Matlab script generates a pair of random-dot stereograms with
a central vertical strip sticking out (closer to you) from the background on each side.

DisparityEnergyModelscript.m:

This Matlab script computes binocular receptive fields of a complex cell
and its linear subunits (simple cells).
Computed results are displayed in 3 windows.  Captured version of these
are in results/DisparityEnergyModelscript_1.png, ..2.png, and ..3.png.

Figure 1: Binocular and monocular receptive fields of a pair of subunits.
Figure 2: Binocular and monocular receptive fields of a pair of subunits which are in quadrature relationship with the others shown in Figure 1.
Figure 3: Binocular receptive field of the complex cell, tuned to non-zero disparity.

DisparityDetectionscript.m:

This Matlab script computes the responses of a complex cell to a random-dot stereogram.
The model disparity model is implemented by 1-d profiles monocularly, which requires
only one scan-line worth of data.  Therefore, the plot represents
the sum of activities from all rows (scan lines) of the random-dot stereogram as viewed by
this 1-d complex cell model.  What this model does is not that different from that of
an actual complex cell.  If we take the 1-d profile we modeled as representing the
X-dimension of the receptive fields, the Y-dimension (direction parallel to the orientation)
of a receptive field is generally a Gaussian.  Real cells weight the Y-dimension according
to a Gaussian.  The simplistic model sums the Y-dimension with equal weight (rectangular
windowing).  Each time one runs this script, a different random-dot stereogram is
generated, and one can observe the variability in the responses due to stimulus variations.
In spite of these variations, it is clear that the responses of the complex cell in the
central strip region is consistently higher than the cell

Rights

This work is licensed under a Creative Commons Attribution 2.5 License.

Index

/ Public / Visiome 2004 / Visual System / Perception/Cognition / Depth Perception / Binocular Disparity
/ Public / Visiome 2004 / Visual System / Visual Pathway / V1/Area 17/Striate Cortex / Stimulus Specificity / Disparity
/ Public / Model
/ Public / Demonstration

Related to

Item summary

Stereoscopic depth discrimination in the visual cortex:neurons ideally suited as disparity detectors
Ohzawa I , DeAngelis GC , Freeman RD
Science 1990 ;249 (4972) :1037-1041 [PMID: 2396096]

Physiological computation of binocular disparity
Qian N , Zhu Y
Vision Research 1997 ;37 (13) :1811-1827

Mechanisms of stereoscopic vision: the disparity energy model.
Ohzawa I
Curr Opin Neurobiol 1998 ;8 (4) :509-15 [PMID: 9751654]

Encoding of binocular disparity:energy models, position shifts and phase shifts
Fleet DJ , Wagner H , Heeger DJ
Vision Research 1996 ;36 (12) :1839-1857

Phase model: encoding of binocular disparity by simple cells
Izumi Ohzawa

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J. Neurophysiol 1997 ;77 (6) :2879-2909 [PMID: 9212245]

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Izumi Ohzawa

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Nature 1997 ;389 (6648) :280-283 [PMID: 9305841]

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J Neurophysiol 2002 ;87 (1) :191-208 [PMID: 11784742]

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J Neurophysiol 1999 ;82 (2) :909-24 [PMID: 10444686]