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 Experiment Videos

Attention mechanisms for multi-location first- and second-order motion perception.

Z L Lu1, C Q Liu, B A Dosher

  • 1Department of Psychology, University of Southern California, Los Angeles 90089-1061, USA.

Vision Research
|May 4, 2000
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

[Analysis on epidemiology trends of overweight, obesity, and body mass index in adults aged 18-69 years in Shandong Province, 2004-2023].

Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi·2025
Same author

[Analysis of the trend and spatial aggregation of cervical cancer mortality in Shandong Province, 1970-2021].

Zhonghua zhong liu za zhi [Chinese journal of oncology]·2025
Same author

[Analysis of the trend and spatial clustering of esophageal cancer mortality in Shandong Province from 1970 to 2021].

Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine]·2025
Same author

[Analysis of the trend and spatial clustering of lung cancer mortality in Shandong Province from 1970 to 2021].

Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine]·2025
Same author

[Pathological assessment and prognosis of SMARCA4-deletion non-small cell lung cancer with neoadjuvant therapy].

Zhonghua bing li xue za zhi = Chinese journal of pathology·2025
Same author

[The spatio-temporal trend of female breast cancer incidence and mortality in Shandong Province from 2012 to 2023 and trend prediction].

Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi·2025
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
Same journal

Pupil reflexes generate the peripheral drift illusion due to ON/OFF motion responses.

Vision research·2026
Same journal

Perceived direction of glass patterns can flip by 90°: A neural model.

Vision research·2026
See all related articles

Visual attention allows simultaneous processing of first-order motion direction at two locations without capacity limits. However, second-order motion perception at unattended locations suffers significant processing loss, indicating attention enhances contrast or reduces noise.

Area of Science:

  • Visual neuroscience
  • Cognitive psychology
  • Perception

Background:

  • Attention mechanisms are crucial for selective information processing in vision.
  • Distinguishing between first-order (luminance-defined) and second-order (contrast-defined) motion is fundamental to understanding visual processing.
  • The external noise paradigm is a powerful tool for probing the capacity limits of perceptual systems.

Purpose of the Study:

  • To investigate the role of attention in concurrent first-order and second-order motion perception at two spatial locations.
  • To determine if attentional capacity is limited for processing motion direction simultaneously at multiple locations.
  • To quantify the effect of attention on the processing of different types of motion stimuli under varying noise conditions.

Main Methods:

Related Experiment Videos

  • Utilized the external noise plus attention paradigm with observers judging motion direction.
  • Employed first-order and second-order motion stimuli presented at two spatial locations.
  • Measured motion detection thresholds across different levels of external noise and attentional focus.

Main Results:

  • First-order motion direction was processed simultaneously at two locations without capacity loss, even with substantial external noise.
  • Second-order motion direction processing at the unattended location showed considerable performance loss.
  • Attending to a location for second-order motion perception effectively increased stimulus contrast by approximately 1.37 times.

Conclusions:

  • The visual system exhibits no capacity limitation for simultaneous first-order motion direction processing at separate locations.
  • Attention significantly enhances second-order motion perception, likely by increasing effective stimulus contrast or reducing internal noise.
  • These findings highlight distinct attentional demands for processing first-order versus second-order visual motion.