Besseling, Florine (2025) Measuring and modeling the difference in temporal integration at and off spontaneous otoacoustic emission frequencies. Master's Internship Report, Biomedical Engineering.
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Abstract
It has been known for almost fifty years that the ear is not only able to receive sound, but also produces tones on its own: spontaneous otoacoustic emissions (SOAEs). The ear’s ability to accumulate acoustic energy over time, temporal integration, is known to be affected by these spontaneous emissions. To investigate this effect, experiments were done on ten normal hearing participants, to collect data on differences in temporal integration for stimulus tones on and off SOAE frequencies. In addition, a non-linear oscillator model based on the Van der Pol equation was developed to compare with experimental results. The experimental results showed the temporal integration slope to be steeper at SOAE frequencies than off them, suggesting enhanced auditory sensitivity at SOAE frequencies. These findings were consistent with prior literature. The simulation results also demonstrated steeper slopes at SOAE frequencies, indicating that at SOAE frequencies energy can be transferred more efficient to the hearing system. Differences in the starting phase were shown to lead to variability in the measurement slopes, when the stimulus frequency was near the SOAE frequency, where phase interactions occur. This was consistent with prior literature. Although the simplified model was based on a single emission system and excluded noise, it successfully captured the key features of SOAE dynamics, such as spontaneous oscillations, frequency selectivity and sensitivity to external stimuli.
| Item Type: | Thesis (Master's Internship Report) |
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| Supervisor name: | Dijk, P. van |
| Degree programme: | Biomedical Engineering |
| Thesis type: | Master's Internship Report |
| Language: | English |
| Date Deposited: | 04 Jul 2025 08:07 |
| Last Modified: | 04 Jul 2025 08:07 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/35816 |
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