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Automatic time perception in the human brain for intervals ranging from milliseconds to seconds.
Risto Näätänen1, Olga Syssoeva, Rika Takegata
1Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland. risto.naatanen@helsinki.fi
Psychophysiology
|June 11, 2004
Summary
This study shows automatic auditory duration discrimination extends to seconds, but is most effective for milliseconds. Researchers used mismatch negativity (MMN) to assess this time perception mechanism.
Area of Science:
- Auditory perception
- Cognitive neuroscience
- Time perception
Background:
- Human time perception encompasses various interval durations.
- Automatic processing of auditory stimuli is crucial for daily functioning.
- Mismatch negativity (MMN) serves as a neural index for automatic auditory change detection.
Purpose of the Study:
- To investigate if automatic duration discrimination in audition functions for intervals lasting seconds.
- To determine the optimal time scale for automatic auditory duration discrimination.
Main Methods:
- Utilizing mismatch negativity (MMN) as a measure of automatic change detection.
- Presenting standard auditory tones with durations exceeding one second.
- Introducing occasional decrements in standard tone duration as deviant stimuli.
- Conducting complementary experiments varying interstimulus intervals and duration change magnitude.
Main Results:
- MMN was elicited even for standard tone durations over one second.
- A significant reduction in MMN amplitude was observed for durations of 800 ms and above.
- Results were corroborated by experiments manipulating interstimulus interval and duration change size.
Conclusions:
- Automatic duration discrimination in audition is functional for intervals of seconds.
- The optimal time scale for this automatic auditory process appears to be in the millisecond range.