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Updated: Jul 17, 2026
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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Auditory apparent motion between sine waves differing in frequency
1Department of Psychology, California State University Long Beach 90840, USA. tstrybel@csulb.edu
Perception
|November 3, 1998
Summary
Auditory apparent motion (AAM) perception depends on frequency differences between sounds. At lower frequencies, AAM occurs with similar sound frequencies, while higher frequencies show increased AAM range with stimulus onset asynchrony.
Area of Science:
- Auditory perception
- Psychoacoustics
- Human sensory systems
Background:
- Auditory apparent motion (AAM) describes the perception of sound moving over time.
- Understanding AAM is crucial for audio engineering, virtual reality, and psychoacoustic research.
- Factors influencing AAM, such as frequency differences, require detailed investigation.
Purpose of the Study:
- To investigate the impact of frequency disparities between lead and lag stimuli on AAM.
- To determine how stimulus onset asynchrony (SOA) and standard frequency influence AAM perception.
- To explore the relationship between frequency, SOA, and AAM, comparing findings to visual apparent motion principles.
Main Methods:
- Two experiments were conducted, varying standard frequencies (500, 1000, 5000 Hz) and SOAs (40-210 ms).
- Participants perceived AAM when frequency differences between lead and lag stimuli were within specific ranges.
- Experiment 1 used constant SOA and frequency per session, while Experiment 2 varied SOA within sessions.
Main Results:
- At 500 and 1000 Hz, AAM was perceived when frequency differences were within 100 Hz.
- At 5000 Hz, the range of frequencies yielding AAM expanded as SOA increased.
- At 500 Hz, AAM was independent of comparison frequency; at 5000 Hz, it increased with comparison frequency, mirroring Korte's third law.
Conclusions:
- Frequency difference is a critical factor in AAM, with varying effects based on standard frequency.
- The findings at 5000 Hz suggest a parallel between auditory and visual apparent motion perception.
- Further research can refine models of auditory spatial hearing and motion perception.
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