Related Experiment Video
Updated: Aug 8, 2026
09:52
How to Find Effects of Stimulus Processing on Event Related Brain Potentials of Close Others when Hyperscanning Partners
Published on: May 31, 2018
Probability-independent and -dependent ERPs reflecting visual change detection
Motohiro Kimura1, Jun'ichi Katayama, Harumitsu Murohashi
1Graduate School of Education, Hokkaido University, Sapporo, Japan. m-kimura@edu.hokudai.ac.jp
Psychophysiology
|May 23, 2006
Summary
This study reveals two distinct visual change detection processes in the brain. One is independent of stimulus probability, while the other depends on it, suggesting complex visual processing.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Electrophysiology
Background:
- Event-related potentials (ERPs) show posterior components linked to visual change detection.
- Previous research has not fully differentiated these components based on preceding stimulus sequences.
Purpose of the Study:
- To compare ERP components' sensitivity to preceding stimulus sequences in visual change detection.
- To investigate probability-dependent and -independent visual processing mechanisms.
Main Methods:
- 12 participants performed central shape discrimination while viewing peripheral red and blue stimuli.
- Stimulus probabilities were varied (50:50, 20:80, 80:20) to assess ERP responses.
- Analysis focused on posterior positivity (90-140 ms) and negativity (140-180 ms).
Main Results:
- A posterior positivity showed consistent amplitude regardless of preceding stimulus.
- A posterior negativity's amplitude increased with more preceding different stimuli.
- This indicates both probability-independent and -dependent visual change detection.
Conclusions:
- The human visual system employs distinct mechanisms for change detection.
- Findings suggest probability-independent processing and probability-dependent processing linked to memory-based comparison and refractoriness.
