Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

8.9K
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
8.9K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

2.7K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
2.7K
Visual System01:26

Visual System

2.3K
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
2.3K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

8.5K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
8.5K
Sight Distance in a Vertical Curve01:29

Sight Distance in a Vertical Curve

556
Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
556
Vision01:24

Vision

48.5K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
48.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Dorsal visual stream development improves symmetry of receptive field coverage and spatial attention.

bioRxiv : the preprint server for biology·2026
Same author

Distinct Attentional Control Profiles during Language Comprehension in Major Mental Health Disorders.

Biological psychiatry. Cognitive neuroscience and neuroimaging·2026
Same author

Higher-order thalamic bursts are drivers of attention control.

Neuron·2026
Same author

Computerized assessments of emotional expression and emotional reactivity predict negative symptoms in individuals at clinical high-risk for psychosis.

Psychological medicine·2026
Same author

Value representation in youth psychopathology: evidence of a transdiagnostic risk mechanism for psychosis.

Translational psychiatry·2026
Same author

KIASORT: Knowledge-Integrated Automated Spike Sorting for Geometry-Free Neuron Tracking.

The Journal of neuroscience : the official journal of the Society for Neuroscience·2026

Related Experiment Video

Updated: Apr 29, 2026

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
06:25

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

1.3K

Is 20/20 vision good enough? Visual acuity differences within the normal range predict contour element detection and

Brian P Keane1, Sabine Kastner, Danielle Paterno

  • 1Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA, brian.keane@gmail.com.

Psychonomic Bulletin & Review
|May 22, 2014
PubMed
Summary

Even small differences in normal visual acuity significantly impact contour integration and element detection. These acuity variations can confound studies on visual processing, highlighting the need for careful control in research.

More Related Videos

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

7.7K
Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

1.0K

Related Experiment Videos

Last Updated: Apr 29, 2026

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
06:25

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

1.3K
Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

7.7K
Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

1.0K

Area of Science:

  • Visual neuroscience
  • Perceptual psychology
  • Ophthalmology

Background:

  • Contour integration (CI) and collinear facilitation (CF) are key visual processes relying on long-range connections in the early visual cortex.
  • These processes are crucial for understanding visual functioning across different age groups and in various clinical conditions.
  • Previous research has extensively studied CI and CF, but the influence of subtle acuity differences remains underexplored.

Purpose of the Study:

  • To investigate whether variations in visual acuity within the normal range can predict performance on contour integration (CI) and collinear facilitation (CF) tasks.
  • To determine if individuals with better-than-normal visual acuity (SharpPerceivers) exhibit enhanced performance on CI and CF tasks compared to those with 20/20 vision.
  • To assess the potential confounding effect of visual acuity on studies of visual cortical functioning.

Main Methods:

  • Participants were divided into two groups: those with 20/20 vision and those with better-than-20/20 vision (SharpPerceivers).
  • Performance was measured using two tasks: a CI task involving locating a shape in noise, and a CF task detecting a low-contrast element flanked by collinear or orthogonal elements.
  • Stimuli were scaled to modulate element visibility and spatial frequency (4-12 cycles/deg) to analyze acuity effects.

Main Results:

  • SharpPerceivers demonstrated superior contour integration abilities, performing better under noisier conditions, particularly with high spatial frequencies (p = .0002).
  • While both groups showed similar collinear facilitation, SharpPerceivers detected targets at lower contrast levels in high spatial frequency displays (p < .05).
  • Small acuity differences, equivalent to one line on a vision chart, significantly predicted performance in element detection and integration.

Conclusions:

  • Subtle variations in normal visual acuity strongly influence performance on contour integration and element detection tasks.
  • Visual acuity serves as a significant factor that can confound results in studies examining visual processing, even when vision is considered normal.
  • Researchers must account for visual acuity differences when designing and interpreting studies on contour-based visual tasks to ensure accurate findings.