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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
Detection of colour change in moving objects: temporal order judgment and reaction time analysis
Carolina Murd1, Kairi Kreegipuu, Jüri Allik
1Institute of Psychology and the Estonian Center of Behavioral and Health Sciences, University of Tartu, Tiigi 78, Tartu 50410, Estonia. Carolina.Murd@ut.ee
Perception
|February 3, 2010
Summary
Stimulus velocity does not affect color change detection in moving gratings. This suggests our brain
Area of Science:
- Visual perception
- Cognitive psychology
- Neuroscience
Background:
- Previous research indicated faster color change detection with increased stimulus velocity.
- The universality of this velocity effect across different tasks and stimuli remained unexplored.
Purpose of the Study:
- To investigate if stimulus velocity influences color change detection in moving gratings using temporal order judgment (TOJ) and reaction time (RT) tasks.
- To determine if the previously observed velocity effect is universal for visual perception.
Main Methods:
- Participants performed temporal order judgment (TOJ) and reaction time (RT) tasks.
- Color change detection was assessed for moving chromatic bars and sinusoidal gratings at varying velocities.
Main Results:
- Color change detection in moving gratings, assessed via TOJ and RT, was found to be insensitive to stimulus velocity.
- The previously reported motion effect on color perception appears specific to single, spatially predictable stimuli.
Conclusions:
- The brain's comparison of internal representations lacks the temporal precision to accurately gauge subjective awareness timing.
- Motion's influence on color change detection is limited to specific conditions, not a general phenomenon.
