Related Experiment Video
Updated: Jun 16, 2026
13:00
Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
What is the unit of visual attention? Object for selection, but Boolean map for access.
1The Chinese University of Hong Kong, Hong Kong, The People's Republic of China. lqhuang@psy.cuhk.edu.hk
Journal of Experimental Psychology. General
|February 4, 2010
Summary
Visual attention is not accessed by objects, but by Boolean maps. This study distinguishes between access and selection units, showing maps are key for visual perception measurement.
Area of Science:
- Cognitive Psychology
- Visual Perception
Background:
- Prevailing theories suggest objects are the fundamental unit of visual attention.
- A distinction between 'unit of access' (measurement) and 'unit of selection' (division) is crucial.
Purpose of the Study:
- To investigate the true unit of visual attention.
- To differentiate between object-based and feature-based visual processing.
Main Methods:
- Experimental manipulation of object grouping and feature perception.
- Analysis of performance in enumeration and tracking tasks.
- Comparison of results with existing literature.
Main Results:
- Object grouping did not enhance item perception.
- Same-object advantage was contingent on features belonging to a single Boolean map.
- Feature cuing effects varied based on feature dimensionality and object structure.
Conclusions:
- The unit of visual access is a Boolean map, not an object.
- Object structure influences selection mechanisms but not access.
- Findings challenge object-centric models of visual attention.
Related Concept Videos
01:26Visual System
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...
Once through the pupil, the light passes through the lens, a...
01:24Vision
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.
01:20Parallel Processing
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
01:21Association Areas of the Cortex
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...