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Updated: Feb 13, 2026
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
Published on: December 20, 2016
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Temporal Effects on Monaural Amplitude-Modulation Sensitivity in Ipsilateral, Contralateral and Bilateral Noise
Miriam I Marrufo-Pérez1,2, Almudena Eustaquio-Martín1,2, Luis E López-Bascuas3
1Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Calle Pintor Fernando Gallego 1, 37007, Salamanca, Spain.
Summary
Temporal adaptation improves amplitude modulation (AM) detection in noise. Presenting the AM carrier later in the noise, rather than earlier, significantly enhances detection thresholds, suggesting complex auditory processing mechanisms.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Speech Processing
Background:
- Amplitude modulations (AMs) are crucial for speech recognition.
- Auditory adaptation mechanisms can improve AM detection in noise.
- Timing of AM carrier presentation relative to noise onset may influence detection.
Purpose of the Study:
- To characterize temporal adaptation to noise in amplitude modulation detection.
- To investigate the effect of noise laterality on temporal adaptation in AM detection.
Main Methods:
- Measured AM detection thresholds for pure-tone carriers.
- Compared 'early' (onset) and 'late' (300 ms after onset) carrier presentation conditions.
- Varied noise laterality (ipsilateral, contralateral, diotic) and spectral content (broadband, low-band).
Main Results:
- Detection thresholds were 2-4 dB better in the 'late' condition across all noise lateralities.
- The temporal effect persisted at equal sensation levels, ruling out carrier audibility overshoot.
- The temporal effect was more pronounced for broadband noise than low-band contralateral noise.
Conclusions:
- Temporal adaptation significantly enhances AM detection in noise.
- Results suggest involvement of both peripheral (medial olivocochlear reflex) and central auditory adaptation mechanisms.
- Central masking and adaptation play a role in the observed temporal effects on AM detection.
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