Related Experiment Video
Updated: May 28, 2026
07:43
Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
Published on: June 17, 2019
Evidence for a shared mechanism used in multiple-object tracking and subitizing
Dana L Chesney1, Harry Haroutioun Haladjian
1Department of Psychology, University of Notre Dame, 118 Haggar Hall, Notre Dame, IN 46556, USA. Dana.Chesney.3@nd.edu
Attention, Perception & Psychophysics
|October 5, 2011
Summary
The ability to track multiple moving objects shares a visual mechanism with subitizing, the quick enumeration of small object sets. Performance on subitizing tasks decreased as the number of tracked objects increased, supporting this shared mechanism.
Area of Science:
- Cognitive Psychology
- Visual Perception
Background:
- Subitizing allows rapid enumeration of small object quantities.
- Multiple object tracking (MOT) involves following several moving items.
- A proposed shared mechanism links MOT and subitizing.
Purpose of the Study:
- To investigate if the mechanism supporting MOT also supports subitizing.
- To test the shared visual mechanism hypothesis by combining tasks.
Main Methods:
- Participants performed simultaneous enumeration and MOT tasks.
- Enumeration involved identifying flashed squares (0-9).
- MOT involved tracking moving discs (0, 2, or 4).
Main Results:
- Subitizable quantity decreased by one for each tracked object.
- This effect was specific to visual tasks.
- No impairment was observed when enumeration was paired with a non-visual working memory task.
Conclusions:
- Findings suggest a shared visual mechanism underlies both MOT and subitizing.
- This shared resource is likely modality-specific (visual).
- The study provides evidence for integrated visual processing in attention and enumeration.
