Object recognition by a donut

Denis Pelli, MoonHee Lee, Marialuisa Martelli, Najib Majaj

Research output: Contribution to journalArticle

Abstract

Olzak and Thomas posited "cigar" channels, which integrate across a wide range of frequency and a narrow range of orientation, and "donut" channels, which integrate across all orientations and a narrow range of frequency. Majaj et al. (Vision Research, in press) used critical band masking to measure the radial frequency tuning of the channel that observers use to identify letters, and always found the same one-or-so-octave bandwidth: no cigar. We did similar critical band masking experiments, but restricting orientation instead of radial frequency of the noise spectrum. With a grating signal, we reveal a channel tuned to the grating orientation, as expected. Witha letter signal, we reveal a channel that is equally sensitive to all orientations: a donut. It is a first-, not second-, order channel, as shown by the fact that the threshold energy elevation sums linearly across orientations. Thus, the letter identification channel is a donut.

Original languageEnglish (US)
JournalJournal of Vision
Volume2
Issue number7
DOIs
StatePublished - 2002

Fingerprint

Tobacco Products
Noise
Research

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Object recognition by a donut. / Pelli, Denis; Lee, MoonHee; Martelli, Marialuisa; Majaj, Najib.

In: Journal of Vision, Vol. 2, No. 7, 2002.

Research output: Contribution to journalArticle

Pelli, D, Lee, M, Martelli, M & Majaj, N 2002, 'Object recognition by a donut', Journal of Vision, vol. 2, no. 7. https://doi.org/10.1167/2.7.699
Pelli, Denis ; Lee, MoonHee ; Martelli, Marialuisa ; Majaj, Najib. / Object recognition by a donut. In: Journal of Vision. 2002 ; Vol. 2, No. 7.
@article{a3ed75951afc4b01bf3a5cd257a75b13,
title = "Object recognition by a donut",
abstract = "Olzak and Thomas posited {"}cigar{"} channels, which integrate across a wide range of frequency and a narrow range of orientation, and {"}donut{"} channels, which integrate across all orientations and a narrow range of frequency. Majaj et al. (Vision Research, in press) used critical band masking to measure the radial frequency tuning of the channel that observers use to identify letters, and always found the same one-or-so-octave bandwidth: no cigar. We did similar critical band masking experiments, but restricting orientation instead of radial frequency of the noise spectrum. With a grating signal, we reveal a channel tuned to the grating orientation, as expected. Witha letter signal, we reveal a channel that is equally sensitive to all orientations: a donut. It is a first-, not second-, order channel, as shown by the fact that the threshold energy elevation sums linearly across orientations. Thus, the letter identification channel is a donut.",
author = "Denis Pelli and MoonHee Lee and Marialuisa Martelli and Najib Majaj",
year = "2002",
doi = "10.1167/2.7.699",
language = "English (US)",
volume = "2",
journal = "Journal of Vision",
issn = "1534-7362",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "7",

}

TY - JOUR

T1 - Object recognition by a donut

AU - Pelli, Denis

AU - Lee, MoonHee

AU - Martelli, Marialuisa

AU - Majaj, Najib

PY - 2002

Y1 - 2002

N2 - Olzak and Thomas posited "cigar" channels, which integrate across a wide range of frequency and a narrow range of orientation, and "donut" channels, which integrate across all orientations and a narrow range of frequency. Majaj et al. (Vision Research, in press) used critical band masking to measure the radial frequency tuning of the channel that observers use to identify letters, and always found the same one-or-so-octave bandwidth: no cigar. We did similar critical band masking experiments, but restricting orientation instead of radial frequency of the noise spectrum. With a grating signal, we reveal a channel tuned to the grating orientation, as expected. Witha letter signal, we reveal a channel that is equally sensitive to all orientations: a donut. It is a first-, not second-, order channel, as shown by the fact that the threshold energy elevation sums linearly across orientations. Thus, the letter identification channel is a donut.

AB - Olzak and Thomas posited "cigar" channels, which integrate across a wide range of frequency and a narrow range of orientation, and "donut" channels, which integrate across all orientations and a narrow range of frequency. Majaj et al. (Vision Research, in press) used critical band masking to measure the radial frequency tuning of the channel that observers use to identify letters, and always found the same one-or-so-octave bandwidth: no cigar. We did similar critical band masking experiments, but restricting orientation instead of radial frequency of the noise spectrum. With a grating signal, we reveal a channel tuned to the grating orientation, as expected. Witha letter signal, we reveal a channel that is equally sensitive to all orientations: a donut. It is a first-, not second-, order channel, as shown by the fact that the threshold energy elevation sums linearly across orientations. Thus, the letter identification channel is a donut.

UR - http://www.scopus.com/inward/record.url?scp=4243069381&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243069381&partnerID=8YFLogxK

U2 - 10.1167/2.7.699

DO - 10.1167/2.7.699

M3 - Article

AN - SCOPUS:4243069381

VL - 2

JO - Journal of Vision

JF - Journal of Vision

SN - 1534-7362

IS - 7

ER -