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

Causes of Similarity-Dissimilarity Effect01:26

Causes of Similarity-Dissimilarity Effect

201
The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
201
Sign Test for Matched Pairs01:17

Sign Test for Matched Pairs

352
The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
To conduct the sign test, we first calculate the differences in...
352
Wilcoxon Signed-Ranks Test for Matched Pairs01:09

Wilcoxon Signed-Ranks Test for Matched Pairs

407
The Wilcoxon signed-rank test for matched pairs evaluates the null hypothesis by combining the ranks of differences with their signs. It essentially tests whether the median of the differences in a population of matched pairs is zero. Since the test incorporates more information than the sign test, it generally yields more trustable conclusions. This test also does not require the data to follow a normal distribution, but two conditions must be met for it to be applicable: (1) the data must...
407
Perceptual Constancy01:12

Perceptual Constancy

1.1K
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...
1.1K
Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

6.3K
It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
6.3K
Collisions in Multiple Dimensions: Problem Solving01:06

Collisions in Multiple Dimensions: Problem Solving

5.1K
In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
5.1K

You might also read

Related Articles

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

Sort by
Same author

Chitinase-3-Like 1 Protein (CHI3L1) Levels in Patients With Cognitive Deficits and Movement Disorders: Comparison With Other Biomarkers.

Brain and behavior·2025
Same author

Therapeutic plasma exchange in multiple sclerosis patients with an aggressive relapse: an observational analysis in a high-volume center.

Scientific reports·2022
Same author

Serum neurofilament levels in patients with multiple sclerosis: A comparison of SIMOA and high sensitivity ELISA assays and contributing factors to ELISA levels.

Multiple sclerosis and related disorders·2022
Same author

Chemical and electronic structure of the heavily intermixed (Cd,Zn)S:Ga/CuSbS<sub>2</sub> interface.

Faraday discussions·2022
Same author

Local electronic structure of the peptide bond probed by resonant inelastic soft X-ray scattering.

Physical chemistry chemical physics : PCCP·2019
Same author

SlPRA1A/RAB attenuate EIX immune responses via degradation of LeEIX2 pattern recognition receptor.

Plant signaling & behavior·2018
Same journal

Impact of crowding on visual appearance and performance in amblyopia.

Vision research·2026
Same journal

Editorial for VSI Amblyopia: Advances in Amblyopia Research.

Vision research·2026
Same journal

Computational and mathematical models in vision: Quantitative approaches to understanding visual perception.

Vision research·2026
Same journal

Complex interactions between lightness, chroma, and hue in color ensemble perception.

Vision research·2026
Same journal

Driving with autism spectrum disorder: Exploring the impact of tactile hazard warnings on gaze behavior and hazard responses.

Vision research·2026
Same journal

Early visual processing in adults with ADHD: evidence from contrast sensitivity, spatial integration, and external noise.

Vision research·2026
See all related articles

Related Experiment Videos

One-shot viewpoint invariance in matching novel objects.

I Biederman1, M Bar

  • 1Department of Psychology, University of Southern California, Los Angeles 90089-2520, USA. bieder@usc.edu

Vision Research
|September 24, 1999
PubMed
Summary
This summary is machine-generated.

Object recognition relies on non-accidental properties (NAPs), not metric properties (MPs). NAPs are crucial for recognizing objects from different viewpoints, unlike MPs which are significantly impacted by rotation.

Related Experiment Videos

Area of Science:

  • Cognitive Psychology
  • Computer Vision
  • Neuroscience

Background:

  • Humans excel at recognizing objects despite changes in orientation.
  • Two main theories explain this: metric properties (MPs) and non-accidental properties (NAPs).

Purpose of the Study:

  • To investigate the role of MPs versus NAPs in object recognition under rotation.
  • To compare the impact of depth rotation on judgments based on MPs and NAPs.

Main Methods:

  • Novel objects were presented in sequential image pairs from different viewpoints.
  • Metric property (MP) and non-accidental property (NAP) differences were scaled for equal detectability at a single orientation.
  • Participants made same-different judgments for object matching.

Main Results:

  • Rotation had minimal impact on recognizing objects differing in a single part's NAP (geon).
  • Rotation drastically reduced the detectability of MP differences, performing below chance.
  • NAPs demonstrated a significant advantage over MPs in object classification tasks.

Conclusions:

  • Non-accidental properties (NAPs) are more critical than metric properties (MPs) for robust object recognition across different orientations.
  • NAPs likely play a more central role in the brain's object representation system.