Spatial summation in human cone mechanisms from 0° to 20° in the superior retina

Vicki J. Volbrecht, Erin E. Shrago, Brooke E. Schefrin, John S Werner

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The maximum area of complete spatial summation (i.e., Ricco's area) for human short-wavelength-sensitive(S-) and long-wavelength-sensitive- (L-) cone mechanisms was measured psychophysically at the fovea and at 1.5°, 4°, 8°, and 20° along the vertical meridian in the superior retina. Increment thresholds were measured for three observers by a temporal two-alternative forced-choice procedure. Test stimuli ranging from -0.36 to 4.61 log area (min2) were presented on concentric 12.3° adapting and auxiliary fields, which isolated either an S- or an L-cone mechanism on the plateau of its respective threshold versus intensity function. Test flash durations were 50 and 10 ms for the S- and L-cone mechanisms, respectively. The data indicate that, from 0° to 20°, Ricco's area increases monotonically for the L-cone mechanism, is variable for the S-cone mechanism, and is larger for the S-cone mechanism than for the L-cone mechanism for essentially all retinal locations. This pattern of results most likely reflects differences in ganglion cell density and changes in neural convergence with retinal eccentricity.

Original languageEnglish (US)
Pages (from-to)641-650
Number of pages10
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume17
Issue number3
StatePublished - 2000
Externally publishedYes

Fingerprint

Cones
Wavelength

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Vision and Pattern Recognition

Cite this

Spatial summation in human cone mechanisms from 0° to 20° in the superior retina. / Volbrecht, Vicki J.; Shrago, Erin E.; Schefrin, Brooke E.; Werner, John S.

In: Journal of the Optical Society of America A: Optics and Image Science, and Vision, Vol. 17, No. 3, 2000, p. 641-650.

Research output: Contribution to journalArticle

@article{e71665acd11a40a88b6fec477a5481a7,
title = "Spatial summation in human cone mechanisms from 0° to 20° in the superior retina",
abstract = "The maximum area of complete spatial summation (i.e., Ricco's area) for human short-wavelength-sensitive(S-) and long-wavelength-sensitive- (L-) cone mechanisms was measured psychophysically at the fovea and at 1.5°, 4°, 8°, and 20° along the vertical meridian in the superior retina. Increment thresholds were measured for three observers by a temporal two-alternative forced-choice procedure. Test stimuli ranging from -0.36 to 4.61 log area (min2) were presented on concentric 12.3° adapting and auxiliary fields, which isolated either an S- or an L-cone mechanism on the plateau of its respective threshold versus intensity function. Test flash durations were 50 and 10 ms for the S- and L-cone mechanisms, respectively. The data indicate that, from 0° to 20°, Ricco's area increases monotonically for the L-cone mechanism, is variable for the S-cone mechanism, and is larger for the S-cone mechanism than for the L-cone mechanism for essentially all retinal locations. This pattern of results most likely reflects differences in ganglion cell density and changes in neural convergence with retinal eccentricity.",
author = "Volbrecht, {Vicki J.} and Shrago, {Erin E.} and Schefrin, {Brooke E.} and Werner, {John S}",
year = "2000",
language = "English (US)",
volume = "17",
pages = "641--650",
journal = "Journal of the Optical Society of America. A, Optics and image science",
issn = "1084-7529",
publisher = "The Optical Society",
number = "3",

}

TY - JOUR

T1 - Spatial summation in human cone mechanisms from 0° to 20° in the superior retina

AU - Volbrecht, Vicki J.

AU - Shrago, Erin E.

AU - Schefrin, Brooke E.

AU - Werner, John S

PY - 2000

Y1 - 2000

N2 - The maximum area of complete spatial summation (i.e., Ricco's area) for human short-wavelength-sensitive(S-) and long-wavelength-sensitive- (L-) cone mechanisms was measured psychophysically at the fovea and at 1.5°, 4°, 8°, and 20° along the vertical meridian in the superior retina. Increment thresholds were measured for three observers by a temporal two-alternative forced-choice procedure. Test stimuli ranging from -0.36 to 4.61 log area (min2) were presented on concentric 12.3° adapting and auxiliary fields, which isolated either an S- or an L-cone mechanism on the plateau of its respective threshold versus intensity function. Test flash durations were 50 and 10 ms for the S- and L-cone mechanisms, respectively. The data indicate that, from 0° to 20°, Ricco's area increases monotonically for the L-cone mechanism, is variable for the S-cone mechanism, and is larger for the S-cone mechanism than for the L-cone mechanism for essentially all retinal locations. This pattern of results most likely reflects differences in ganglion cell density and changes in neural convergence with retinal eccentricity.

AB - The maximum area of complete spatial summation (i.e., Ricco's area) for human short-wavelength-sensitive(S-) and long-wavelength-sensitive- (L-) cone mechanisms was measured psychophysically at the fovea and at 1.5°, 4°, 8°, and 20° along the vertical meridian in the superior retina. Increment thresholds were measured for three observers by a temporal two-alternative forced-choice procedure. Test stimuli ranging from -0.36 to 4.61 log area (min2) were presented on concentric 12.3° adapting and auxiliary fields, which isolated either an S- or an L-cone mechanism on the plateau of its respective threshold versus intensity function. Test flash durations were 50 and 10 ms for the S- and L-cone mechanisms, respectively. The data indicate that, from 0° to 20°, Ricco's area increases monotonically for the L-cone mechanism, is variable for the S-cone mechanism, and is larger for the S-cone mechanism than for the L-cone mechanism for essentially all retinal locations. This pattern of results most likely reflects differences in ganglion cell density and changes in neural convergence with retinal eccentricity.

UR - http://www.scopus.com/inward/record.url?scp=0034146761&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034146761&partnerID=8YFLogxK

M3 - Article

C2 - 10708046

AN - SCOPUS:0034146761

VL - 17

SP - 641

EP - 650

JO - Journal of the Optical Society of America. A, Optics and image science

JF - Journal of the Optical Society of America. A, Optics and image science

SN - 1084-7529

IS - 3

ER -