Motion sensitivity and spatial undersampling in amblyopia

R F Hess, S J Anderson

Research output: Contribution to journalArticle

Abstract

The nature of the visual deficit in human amblyopia has been keenly sought over the last decade. Some confusion has arisen as to whether the motion-sensitive mechanisms known to exist in normal vision are selectively affected in humans with amblyopia. To address this issue we compare contrast thresholds for detection and direction discrimination of drifting sine-wave gratings in a group of humans with amblyopia. The results suggest that over the vast majority of the spatio-temporal range, direction of motion can be discriminated at detection threshold. Over a narrow part of the visible range there is a differential loss of sensitivity for direction discrimination over that of simple detection. However such an effect also occurs for normal vision under spatially scaled conditions and it seems likely that it is mediated by non-motion sensitive mechanisms. We show that one possible cause of this loss of direction discrimination, namely spatial undersampling within the central region of the amblyopic visual field, is not a viable explanation.
Original languageEnglish
Pages (from-to)881-96
Number of pages16
JournalVision Research
Volume33
Issue number7
DOIs
Publication statusPublished - May 1993

Fingerprint

Amblyopia
Articular Range of Motion
Visual Fields
Direction compound
Discrimination (Psychology)

Keywords

  • Amblyopia
  • Contrast Sensitivity
  • Discrimination (Psychology)
  • Humans
  • Motion Perception
  • Pattern Recognition, Visual
  • Psychometrics
  • Sensory Thresholds
  • Time Factors

Cite this

@article{0527acc1db214446855fc2a882ac5987,
title = "Motion sensitivity and spatial undersampling in amblyopia",
abstract = "The nature of the visual deficit in human amblyopia has been keenly sought over the last decade. Some confusion has arisen as to whether the motion-sensitive mechanisms known to exist in normal vision are selectively affected in humans with amblyopia. To address this issue we compare contrast thresholds for detection and direction discrimination of drifting sine-wave gratings in a group of humans with amblyopia. The results suggest that over the vast majority of the spatio-temporal range, direction of motion can be discriminated at detection threshold. Over a narrow part of the visible range there is a differential loss of sensitivity for direction discrimination over that of simple detection. However such an effect also occurs for normal vision under spatially scaled conditions and it seems likely that it is mediated by non-motion sensitive mechanisms. We show that one possible cause of this loss of direction discrimination, namely spatial undersampling within the central region of the amblyopic visual field, is not a viable explanation.",
keywords = "Amblyopia, Contrast Sensitivity, Discrimination (Psychology), Humans, Motion Perception, Pattern Recognition, Visual, Psychometrics, Sensory Thresholds, Time Factors",
author = "Hess, {R F} and Anderson, {S J}",
year = "1993",
month = "5",
doi = "10.1016/0042-6989(93)90071-4",
language = "English",
volume = "33",
pages = "881--96",
journal = "Vision Research",
issn = "0042-6989",
publisher = "Elsevier",
number = "7",

}

Motion sensitivity and spatial undersampling in amblyopia. / Hess, R F; Anderson, S J.

In: Vision Research, Vol. 33, No. 7, 05.1993, p. 881-96.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Motion sensitivity and spatial undersampling in amblyopia

AU - Hess, R F

AU - Anderson, S J

PY - 1993/5

Y1 - 1993/5

N2 - The nature of the visual deficit in human amblyopia has been keenly sought over the last decade. Some confusion has arisen as to whether the motion-sensitive mechanisms known to exist in normal vision are selectively affected in humans with amblyopia. To address this issue we compare contrast thresholds for detection and direction discrimination of drifting sine-wave gratings in a group of humans with amblyopia. The results suggest that over the vast majority of the spatio-temporal range, direction of motion can be discriminated at detection threshold. Over a narrow part of the visible range there is a differential loss of sensitivity for direction discrimination over that of simple detection. However such an effect also occurs for normal vision under spatially scaled conditions and it seems likely that it is mediated by non-motion sensitive mechanisms. We show that one possible cause of this loss of direction discrimination, namely spatial undersampling within the central region of the amblyopic visual field, is not a viable explanation.

AB - The nature of the visual deficit in human amblyopia has been keenly sought over the last decade. Some confusion has arisen as to whether the motion-sensitive mechanisms known to exist in normal vision are selectively affected in humans with amblyopia. To address this issue we compare contrast thresholds for detection and direction discrimination of drifting sine-wave gratings in a group of humans with amblyopia. The results suggest that over the vast majority of the spatio-temporal range, direction of motion can be discriminated at detection threshold. Over a narrow part of the visible range there is a differential loss of sensitivity for direction discrimination over that of simple detection. However such an effect also occurs for normal vision under spatially scaled conditions and it seems likely that it is mediated by non-motion sensitive mechanisms. We show that one possible cause of this loss of direction discrimination, namely spatial undersampling within the central region of the amblyopic visual field, is not a viable explanation.

KW - Amblyopia

KW - Contrast Sensitivity

KW - Discrimination (Psychology)

KW - Humans

KW - Motion Perception

KW - Pattern Recognition, Visual

KW - Psychometrics

KW - Sensory Thresholds

KW - Time Factors

UR - http://www.sciencedirect.com/science/article/pii/0042698993900714

U2 - 10.1016/0042-6989(93)90071-4

DO - 10.1016/0042-6989(93)90071-4

M3 - Article

C2 - 8506631

VL - 33

SP - 881

EP - 896

JO - Vision Research

JF - Vision Research

SN - 0042-6989

IS - 7

ER -