Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

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.

Perceptual Constancy

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...

Virtual Work for a System of Connected Rigid Bodies

Virtual Work for a System of Connected Rigid Bodies

Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...

Focusing of Light in the Eye

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

Virtual Work

Virtual Work

The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...

Conservation of Mass in Fixed, Nondeforming Control Volume

Conservation of Mass in Fixed, Nondeforming Control Volume

The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...

You might also read

Related Articles

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

Sort by

Same author

Exploring the therapeutic potential of recombinant bovine β-defensins for antimicrobial and anti-inflammatory functions in sepsis management.

Veterinary research·2025

Same author

Mining the heparinome for cryptic antimicrobial peptides that selectively kill Gram-negative bacteria.

Molecular systems biology·2025

Same author

V-NeuroStack: Open-source 3D time stack software for identifying patterns in neuronal data.

Journal of neuroscience research·2022

Same author

Antimicrobial Peptides Can Generate Tolerance by Lag and Interfere with Antimicrobial Therapy.

Pharmaceutics·2022

Same author

Examining Topoisomers of a Snake-Venom-Derived Peptide for Improved Antimicrobial and Antitumoral Properties.

Biomedicines·2022

Same author

Rationally Modified Antimicrobial Peptides from the N-Terminal Domain of Human RNase 3 Show Exceptional Serum Stability.

Journal of medicinal chemistry·2021

Search research articles

Related Experiment Video

Updated: Jul 9, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

Accommodation and size-constancy of virtual objects.

Robert V Kenyon¹, Moses Phenany, Daniel Sandin

¹Electronic Visualization Lab, Department of Computer Science (m/c/152), University of Illinois at Chicago, SEO Building, Rm 1120, Chicago, IL 60607, USA. kenyon@uic.edu

Annals of Biomedical Engineering

|December 11, 2007

Summary

This summary is machine-generated.

Virtual environments (VE) can cause size illusions because they lack proper focus cues. This study found that accommodation, the eye's focusing mechanism, does not cause these illusions in VE. Size constancy in VE relies on depth cues, not accommodation.

More Related Videos

Controlled Rotation of Human Observers in a Virtual Reality Environment

Controlled Rotation of Human Observers in a Virtual Reality Environment

Published on: April 21, 2022

Related Experiment Videos

Last Updated: Jul 9, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

Controlled Rotation of Human Observers in a Virtual Reality Environment

Controlled Rotation of Human Observers in a Virtual Reality Environment

Published on: April 21, 2022

Area of Science:

Visual perception
Virtual reality
Human factors

Background:

Size constancy, the perception of an object as its actual size regardless of distance, is often compromised in virtual environments (VE).
This compromise is hypothesized to be linked to the lack of appropriate accommodative stimuli, which are crucial for focusing on objects at different distances.
Previous research indicates monocular depth cues significantly influence size perception in VE.

Purpose of the Study:

To investigate the role of accommodation in size constancy within virtual environments.
To determine if opening-loop accommodation can restore size constancy in visually sparse VE conditions.
To differentiate the contributions of accommodation versus monocular depth cues to size perception in VE.

Main Methods:

Pinhole apertures were employed to create an open-loop accommodation viewing condition.
Participants viewed objects in a low-cue virtual environment with and without pinhole apertures.
Visual angle performance was measured to assess perceived size and size constancy.

Main Results:

The use of pinhole apertures (open-loop accommodation) did not restore size constancy in the low-cue VE.
Visual angle performance remained consistent with or without the pinhole apertures in sparse visual environments.
These findings indicate that accommodation is not the primary factor responsible for the loss of size constancy in VE.

Conclusions:

Accommodation does not play a dominant role in the loss of size constancy in visually sparse virtual environments.
Size constancy in VE appears to be primarily driven by the presence of remaining monocular depth cues.
These findings suggest that understanding and implementing effective depth cues are crucial for accurate size perception in virtual reality.