Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically

Subash Sukumar; Sarah J. Waugh

doi:10.1016/j.visres.2006.10.004

Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically

Subash Sukumar, Sarah J. Waugh

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We estimated spatial summation areas for the detection of luminance-modulated (LM) and contrast-modulated (CM) blobs at the fovea, 2.5, 5 and 10 deg eccentrically. Gaussian profiles were added or multiplied to binary white noise to create LM and CM blob stimuli and these were used to psychophysically estimate detection thresholds and spatial summation areas. The results reveal significantly larger summation areas for detecting CM than LM blobs across eccentricity. These differences are comparable to receptive field size estimates made in V1 and V2. They support the notion that separate spatial processing occurs for the detection of LM and CM stimuli.

Original language	English
Pages (from-to)	581-596
Number of pages	16
Journal	Vision Research
Volume	47
Issue number	5
Early online date	1 Feb 2007
DOIs	https://doi.org/10.1016/j.visres.2006.10.004
Publication status	Published - 1 Mar 2007
Externally published	Yes

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@article{01f61075af674db08dd44fc33ba378d7,

title = "Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically",

abstract = "We estimated spatial summation areas for the detection of luminance-modulated (LM) and contrast-modulated (CM) blobs at the fovea, 2.5, 5 and 10 deg eccentrically. Gaussian profiles were added or multiplied to binary white noise to create LM and CM blob stimuli and these were used to psychophysically estimate detection thresholds and spatial summation areas. The results reveal significantly larger summation areas for detecting CM than LM blobs across eccentricity. These differences are comparable to receptive field size estimates made in V1 and V2. They support the notion that separate spatial processing occurs for the detection of LM and CM stimuli.",

keywords = "Contrast, Luminance, Peripheral vision, Second-order vision, Spatial scaling, Spatial summation",

author = "Subash Sukumar and Waugh, \{Sarah J.\}",

note = "Funding Information: We thank Dr. Laura Doherty for programming support and helpful comments in carrying out this work. We acknowledge helpful suggestions made by two anonymous reviewers. Portions of the results of this work were presented in abstract form at the 2003 Vision Sciences Society Meeting and the 2004 Applied Vision Association Meeting. This work was supported by an Anglia Ruskin University Research Scholarship to S.S. and the Anglia Ruskin University Research Capacity Fund to S.J.W. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2007",

month = mar,

day = "1",

doi = "10.1016/j.visres.2006.10.004",

language = "English",

volume = "47",

pages = "581--596",

journal = "Vision Research",

issn = "0042-6989",

publisher = "Elsevier Limited",

number = "5",

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TY - JOUR

T1 - Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically

AU - Sukumar, Subash

AU - Waugh, Sarah J.

N1 - Funding Information: We thank Dr. Laura Doherty for programming support and helpful comments in carrying out this work. We acknowledge helpful suggestions made by two anonymous reviewers. Portions of the results of this work were presented in abstract form at the 2003 Vision Sciences Society Meeting and the 2004 Applied Vision Association Meeting. This work was supported by an Anglia Ruskin University Research Scholarship to S.S. and the Anglia Ruskin University Research Capacity Fund to S.J.W. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - We estimated spatial summation areas for the detection of luminance-modulated (LM) and contrast-modulated (CM) blobs at the fovea, 2.5, 5 and 10 deg eccentrically. Gaussian profiles were added or multiplied to binary white noise to create LM and CM blob stimuli and these were used to psychophysically estimate detection thresholds and spatial summation areas. The results reveal significantly larger summation areas for detecting CM than LM blobs across eccentricity. These differences are comparable to receptive field size estimates made in V1 and V2. They support the notion that separate spatial processing occurs for the detection of LM and CM stimuli.

AB - We estimated spatial summation areas for the detection of luminance-modulated (LM) and contrast-modulated (CM) blobs at the fovea, 2.5, 5 and 10 deg eccentrically. Gaussian profiles were added or multiplied to binary white noise to create LM and CM blob stimuli and these were used to psychophysically estimate detection thresholds and spatial summation areas. The results reveal significantly larger summation areas for detecting CM than LM blobs across eccentricity. These differences are comparable to receptive field size estimates made in V1 and V2. They support the notion that separate spatial processing occurs for the detection of LM and CM stimuli.

KW - Contrast

KW - Luminance

KW - Peripheral vision

KW - Second-order vision

KW - Spatial scaling

KW - Spatial summation

UR - https://www.scopus.com/pages/publications/33846908108

U2 - 10.1016/j.visres.2006.10.004

DO - 10.1016/j.visres.2006.10.004

M3 - Article

C2 - 17275063

AN - SCOPUS:33846908108

SN - 0042-6989

VL - 47

SP - 581

EP - 596

JO - Vision Research

JF - Vision Research

IS - 5

ER -

Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically

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