Low-spatial-frequency channels and the spatial frequency-doubling illusion

Yanti Rosli, Suzanne M. Bedford, Ted Maddess

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Purpose: This study examined the number and nature of spatiotemporal channels in the region where the frequency-doubling (FD) illusion would be expected to occur at eight locations spanning the central 30° of the visual field. Methods: The probability of seeing the FD illusion was examined in 17 subjects. Stimuli were presented at 5 octaves of low spatial frequencies, at each of seven flicker frequencies in the range 5.65 to 27.95 Hz. In a single trial, subjects matched the apparent spatial frequency of the flickering test pattern using a two-alternative, forced-choice method. Thirteen subjects were examined for stimuli presented at contrast 0.95. Three or four subjects were examined at each of the contrasts 0.2, 0.4, and 0.8. A factor analysis was conducted on the psychometric functions, quantifying the number and possible spatiotemporal tuning of neural channels present. Results: At contrast 0.95, three factors were able to explain 79.3% of the total variance in the psychometric responses to the 35 test conditions. This simple form of three broad spatio-temporal channels was also found at the other contrasts and in different subjects. The factor scores showed differential distribution of the factors onto the eight different visual field locations. Thus the expression of the three channels differed some-what across the visual field. Conclusions: The results support earlier reports, that there are several low-spatial-frequency channels below 1 cyc/deg in the periphery. The results may have implications for the FDT and matrix perimeters.

Original languageEnglish
Pages (from-to)1956-1963
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume50
Issue number4
DOIs
Publication statusPublished - Apr 2009

Fingerprint

Visual Fields
Psychometrics
Statistical Factor Analysis

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience
  • Medicine(all)

Cite this

Low-spatial-frequency channels and the spatial frequency-doubling illusion. / Rosli, Yanti; Bedford, Suzanne M.; Maddess, Ted.

In: Investigative Ophthalmology and Visual Science, Vol. 50, No. 4, 04.2009, p. 1956-1963.

Research output: Contribution to journalArticle

@article{2a7b92b2dcc04df1afe5eea59cf620f5,
title = "Low-spatial-frequency channels and the spatial frequency-doubling illusion",
abstract = "Purpose: This study examined the number and nature of spatiotemporal channels in the region where the frequency-doubling (FD) illusion would be expected to occur at eight locations spanning the central 30° of the visual field. Methods: The probability of seeing the FD illusion was examined in 17 subjects. Stimuli were presented at 5 octaves of low spatial frequencies, at each of seven flicker frequencies in the range 5.65 to 27.95 Hz. In a single trial, subjects matched the apparent spatial frequency of the flickering test pattern using a two-alternative, forced-choice method. Thirteen subjects were examined for stimuli presented at contrast 0.95. Three or four subjects were examined at each of the contrasts 0.2, 0.4, and 0.8. A factor analysis was conducted on the psychometric functions, quantifying the number and possible spatiotemporal tuning of neural channels present. Results: At contrast 0.95, three factors were able to explain 79.3{\%} of the total variance in the psychometric responses to the 35 test conditions. This simple form of three broad spatio-temporal channels was also found at the other contrasts and in different subjects. The factor scores showed differential distribution of the factors onto the eight different visual field locations. Thus the expression of the three channels differed some-what across the visual field. Conclusions: The results support earlier reports, that there are several low-spatial-frequency channels below 1 cyc/deg in the periphery. The results may have implications for the FDT and matrix perimeters.",
author = "Yanti Rosli and Bedford, {Suzanne M.} and Ted Maddess",
year = "2009",
month = "4",
doi = "10.1167/iovs.08-1810",
language = "English",
volume = "50",
pages = "1956--1963",
journal = "Investigative Ophthalmology and Visual Science",
issn = "0146-0404",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "4",

}

TY - JOUR

T1 - Low-spatial-frequency channels and the spatial frequency-doubling illusion

AU - Rosli, Yanti

AU - Bedford, Suzanne M.

AU - Maddess, Ted

PY - 2009/4

Y1 - 2009/4

N2 - Purpose: This study examined the number and nature of spatiotemporal channels in the region where the frequency-doubling (FD) illusion would be expected to occur at eight locations spanning the central 30° of the visual field. Methods: The probability of seeing the FD illusion was examined in 17 subjects. Stimuli were presented at 5 octaves of low spatial frequencies, at each of seven flicker frequencies in the range 5.65 to 27.95 Hz. In a single trial, subjects matched the apparent spatial frequency of the flickering test pattern using a two-alternative, forced-choice method. Thirteen subjects were examined for stimuli presented at contrast 0.95. Three or four subjects were examined at each of the contrasts 0.2, 0.4, and 0.8. A factor analysis was conducted on the psychometric functions, quantifying the number and possible spatiotemporal tuning of neural channels present. Results: At contrast 0.95, three factors were able to explain 79.3% of the total variance in the psychometric responses to the 35 test conditions. This simple form of three broad spatio-temporal channels was also found at the other contrasts and in different subjects. The factor scores showed differential distribution of the factors onto the eight different visual field locations. Thus the expression of the three channels differed some-what across the visual field. Conclusions: The results support earlier reports, that there are several low-spatial-frequency channels below 1 cyc/deg in the periphery. The results may have implications for the FDT and matrix perimeters.

AB - Purpose: This study examined the number and nature of spatiotemporal channels in the region where the frequency-doubling (FD) illusion would be expected to occur at eight locations spanning the central 30° of the visual field. Methods: The probability of seeing the FD illusion was examined in 17 subjects. Stimuli were presented at 5 octaves of low spatial frequencies, at each of seven flicker frequencies in the range 5.65 to 27.95 Hz. In a single trial, subjects matched the apparent spatial frequency of the flickering test pattern using a two-alternative, forced-choice method. Thirteen subjects were examined for stimuli presented at contrast 0.95. Three or four subjects were examined at each of the contrasts 0.2, 0.4, and 0.8. A factor analysis was conducted on the psychometric functions, quantifying the number and possible spatiotemporal tuning of neural channels present. Results: At contrast 0.95, three factors were able to explain 79.3% of the total variance in the psychometric responses to the 35 test conditions. This simple form of three broad spatio-temporal channels was also found at the other contrasts and in different subjects. The factor scores showed differential distribution of the factors onto the eight different visual field locations. Thus the expression of the three channels differed some-what across the visual field. Conclusions: The results support earlier reports, that there are several low-spatial-frequency channels below 1 cyc/deg in the periphery. The results may have implications for the FDT and matrix perimeters.

UR - http://www.scopus.com/inward/record.url?scp=64049101172&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64049101172&partnerID=8YFLogxK

U2 - 10.1167/iovs.08-1810

DO - 10.1167/iovs.08-1810

M3 - Article

C2 - 18469194

AN - SCOPUS:64049101172

VL - 50

SP - 1956

EP - 1963

JO - Investigative Ophthalmology and Visual Science

JF - Investigative Ophthalmology and Visual Science

SN - 0146-0404

IS - 4

ER -