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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Simultaneity and Temporal Order Judgments Are Coded Differently and Change With Age: An Event-Related Potential Study
Aysha Basharat1, Meaghan S Adams1, William R Staines1
1Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada.
Frontiers in Integrative Neuroscience
|May 15, 2018
Summary
Older adults struggle with judging the timing of audiovisual events, especially temporal order judgments (TOJs), but not simultaneity judgments (SJs). This study reveals distinct neural mechanisms for these tasks, differing between age groups.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Human Aging Research
Background:
- Multisensory integration is crucial for daily tasks, and deficits in perceiving temporal aspects of stimuli can lead to errors.
- Previous research indicated older adults have impaired audiovisual temporal order judgments (TOJs) but intact simultaneity judgments (SJs).
Purpose of the Study:
- To investigate neural processing differences between TOJ and SJ tasks in younger and older adults.
- To understand age-related changes in the neural mechanisms underlying simultaneity and temporal order perception.
Main Methods:
- Utilized event-related potentials (ERPs) to compare neural activity between younger and older adults performing TOJ and SJ tasks.
- Analyzed auditory N1 and visual P1 ERP amplitudes to assess unisensory processing and multisensory integration.
Main Results:
- Task-specific neural differences were observed for simultaneity and temporal order perception, suggesting distinct underlying mechanisms.
- Unisensory processing (auditory N1, visual P1) did not differ between tasks or age groups.
- Older adults exhibited a sustained higher auditory N1 ERP amplitude, indicating broader response properties and an extended temporal binding window.
Conclusions:
- Simultaneity judgments (SJs) and temporal order judgments (TOJs) are subserved by different neural mechanisms.
- The perception of simultaneity and temporal order is coded differently and changes with age, particularly impacting older adults' temporal processing abilities.
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