Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli

Mohd Izzuddin Hairol; Sarah J. Waugh

doi:10.1016/j.visres.2010.02.012

Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli

Mohd Izzuddin Hairol, Sarah J. Waugh

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

5 Citations (Scopus)

Abstract

Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6°) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (1. 1. 1) and for CM blobs placed between highly visible CM flankers (2. 2. 2) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8× blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (2. 1. 2) are generally facilitatory but relatively raised for separations of 0.5-2°. For CM blobs placed between highly visible LM flankers (1. 2. 1), facilitation is stronger in the 0.5-2° region. A significant correlation between thresholds and psychometric function slopes is found only for the 2. 1. 2 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci.

Original language	English
Pages (from-to)	889-903
Number of pages	15
Journal	Vision Research
Volume	50
Issue number	9
Early online date	19 Feb 2010
DOIs	https://doi.org/10.1016/j.visres.2010.02.012
Publication status	Published - 21 Apr 2010
Externally published	Yes

Access to Document

10.1016/j.visres.2010.02.012Licence: Other

Cite this

@article{07a5b29706c34f489f0363633aeae38c,

title = "Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli",

abstract = "Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6°) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (1. 1. 1) and for CM blobs placed between highly visible CM flankers (2. 2. 2) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8× blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (2. 1. 2) are generally facilitatory but relatively raised for separations of 0.5-2°. For CM blobs placed between highly visible LM flankers (1. 2. 1), facilitation is stronger in the 0.5-2° region. A significant correlation between thresholds and psychometric function slopes is found only for the 2. 1. 2 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci.",

keywords = "Contrast-modulated, Lateral interactions, Luminance-modulated, Uncertainty reduction",

author = "Hairol, {Mohd Izzuddin} and Waugh, {Sarah J.}",

note = "Funding Information: We acknowledge invaluable discussions and programming support from Laura Doherty and Monika Formankiewicz. Thank you also to the suggestions put forward by two anonymous reviewers. Portions of the results of this study were presented in abstract form at the 2008 Vision Sciences Society Meeting and 2008 Applied Vision Association Christmas Meeting. This research was supported by the Anglia Ruskin University Research Capacity Fund. MIH is funded by a scholarship from the Government of Malaysia via Universiti Kebangsaan Malaysia. Anglia Vision Research is housed in the Department of Vision and Hearing Sciences and is affiliated with VERU (Vision and Eye Research Unit) within the PMI (Postgraduate Medical Institute), Anglia Ruskin University. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

year = "2010",

month = apr,

day = "21",

doi = "10.1016/j.visres.2010.02.012",

language = "English",

volume = "50",

pages = "889--903",

journal = "Vision Research",

issn = "0042-6989",

publisher = "Elsevier Limited",

number = "9",

}

TY - JOUR

T1 - Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli

AU - Hairol, Mohd Izzuddin

AU - Waugh, Sarah J.

N1 - Funding Information: We acknowledge invaluable discussions and programming support from Laura Doherty and Monika Formankiewicz. Thank you also to the suggestions put forward by two anonymous reviewers. Portions of the results of this study were presented in abstract form at the 2008 Vision Sciences Society Meeting and 2008 Applied Vision Association Christmas Meeting. This research was supported by the Anglia Ruskin University Research Capacity Fund. MIH is funded by a scholarship from the Government of Malaysia via Universiti Kebangsaan Malaysia. Anglia Vision Research is housed in the Department of Vision and Hearing Sciences and is affiliated with VERU (Vision and Eye Research Unit) within the PMI (Postgraduate Medical Institute), Anglia Ruskin University. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2010/4/21

Y1 - 2010/4/21

N2 - Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6°) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (1. 1. 1) and for CM blobs placed between highly visible CM flankers (2. 2. 2) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8× blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (2. 1. 2) are generally facilitatory but relatively raised for separations of 0.5-2°. For CM blobs placed between highly visible LM flankers (1. 2. 1), facilitation is stronger in the 0.5-2° region. A significant correlation between thresholds and psychometric function slopes is found only for the 2. 1. 2 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci.

AB - Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6°) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (1. 1. 1) and for CM blobs placed between highly visible CM flankers (2. 2. 2) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8× blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (2. 1. 2) are generally facilitatory but relatively raised for separations of 0.5-2°. For CM blobs placed between highly visible LM flankers (1. 2. 1), facilitation is stronger in the 0.5-2° region. A significant correlation between thresholds and psychometric function slopes is found only for the 2. 1. 2 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci.

KW - Contrast-modulated

KW - Lateral interactions

KW - Luminance-modulated

KW - Uncertainty reduction

UR - http://www.scopus.com/inward/record.url?scp=77950296830&partnerID=8YFLogxK

U2 - 10.1016/j.visres.2010.02.012

DO - 10.1016/j.visres.2010.02.012

M3 - Article

C2 - 20171979

AN - SCOPUS:77950296830

VL - 50

SP - 889

EP - 903

JO - Vision Research

JF - Vision Research

SN - 0042-6989

IS - 9

ER -

Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli

Abstract

Access to Document

Other files and links

Fingerprint

Cite this