Carlos Andres Jurado Orellana
About
I am originally from Chile, where I completed a Bachelor's degree in Acoustics Engineering at
Universidad Austral de Chile. Then I received my MSc degree in Acoustics at Aalborg University (Denmark) and later on my PhD degree in the same institution. My PhD thesis brought me to fascinating topic of human sound perception, specifically I studied the frequency selectivity of the auditory system at low frequencies. I then spent a few years at Universidad de Las Américas (Ecuador), where I did teaching activities and implemented a new psychoacoustics Laboratory via this institution's funding.
Following this, I directed and participated in several research projects aimed to characterize the human perception of low-frequency sound and infrasound (including a collaboration with NASA contractors interested in the procesing of very low-frequency sounds). These projects have involved both psychological and physiological measures (such as EEG, VEMP and OAE), allowing to study their interrelations. I also spent a year as Postdoctoral researcher at the UCL's Ear Institute in London, where I was part of an European-Commission funded project aimed to characterize the human perception of infrasound using state-of-the art equipment and techniques. I am also a self-taught music composer, enjoy very much cycling and hiking. My personal website is https://juradocarlos.com/ (in spanish)
Research
The research I have participated in has been aimed to characterize the human perception of infrasound and low-frequency (ISLF) sound. This has been motivated by the problems associated to ISLF noise and its sources, that can severely affect the quality of life of sensitive individuals. Emphasis has been taken in evaluating objective correlates to perception, involving the measurement of e.g. otoacoustic emissions (OAEs), electroencephalography (EEG) and vestibular-evoked myogenic potentials (VEMPs).
Perceptual measures have included not only the audibility and loudness of ISLF sound, but also their auditory effects on the perception of higher frequencies. Other more qualitative phenomena, such as the loss of pitch perception and the sound segmentation that occur towards ISLFs, have also been studied and are of interest.
Exposure to intense low-frequency sound can temporarily affect sound transduction in the cochlea for a wide range of frequencies. This has been termed the "bounce phenomenon". Evaluating how such exposure affects suprathreshold sound processing, such as the perception of loudness, is a current research goal of interest.
Publications
- Jurado, C. A., Larrea, M., Vizuete, J., Torres, M., Garzón, C., Rodriguez, A., Marquardt, T. (2023). "Infrasound tones at sensation threshold level elicit measurable Frequency-Following responses," J. Acoust. Soc. Am. 154, 50–53. (https://doi.org/10.1121/10.0019962)
- Jurado, C. A., Chow, P., Leung, L., Larrea, M., Vizuete, J., De Cheveigné, A., Marquardt, T. (2022). "The Spectral Extent of Phasic Suppression of Loudness and Distortion-Product Otoacoustic Emissions by Infrasound and Low-Frequency Tones," Journal of the Association for Research in Otolaryngology 23(5):167–181. (http://dx.doi.org/10.1007/s10162-021-00830-2)
- Jurado, C. A. and Moore, B.C.J. (2021). "The Lower Limit of Pitch Perception for Pure Tones and Low-Frequency Complex Sounds," Archives of Acoustics 46(3):459-469. (http://dx.doi.org/10.24425/aoa.2021.138138)
- Jurado, C. A., Larrea, M., Rosero, D., Vizuete, J., Marquardt, T. (2021). "Critical Repetition Rates for Perceptual Segregation of Time-Varying Auditory, Visual and Vibrotactile Stimulation," Timing & Time Perception (published online ahead of print 2021). (http://dx.doi.org/10.1163/22134468-bja10043)
- Jurado, C. A., Larrea, M., Patel, H., Marquardt, T. (2020). "Dependency of threshold and loudness on sound duration at low and infrasonic frequencies," J. Acoust. Soc. Am. 148:1030–1038. (https://asa.scitation.org/doi/10.1121/10.0001760)
- Jurado, C. A. and Marquardt, T. (2020). "Brain’s Frequency Following Responses to Low-Frequency and Infrasound," Archives of Acoustics 45(2):313–319 . (https://acoustics.ippt.pan.pl/index.php/aa/article/view/2605/)
- Jurado, C. A., Gordillo, D. and Moore, B.C.J. (2019). "On the loudness of low-frequency sounds with fluctuating amplitudes," J. Acoust. Soc. Am. 146(2):1142-1149. (https://doi.org/10.1121/1.5121700)
- Jurado, C. A. and Marquardt, T. (2019). "On the effectiveness of airborne infrasound in eliciting vestibular-evoked myogenic responses," Journal of Low Frequency Noise Vibration and Active Control March 2019. (https://doi.org/10.1177/1461348419833868)
- Marquardt, T. and Jurado, C. A. (2018). "Amplitude Modulation May Be Confused with Infrasound," Acta Acustica united with Acustica 104(5):825-829. (https://doi.org/10.3813/AAA.919232)
- Jurado, C. A., Gallegos, P., Gordillo, D., and Moore, B.C.J. (2017). "The detailed shapes of equal-loudness-level contours at low frequencies," J. Acoust. Soc. Am. 142(6):3821–3832. (https://asa.scitation.org/doi/10.1121/1.5018428)
- Jurado, C. A., and Marquardt, T. (2016). "The effect of the helicotrema on low-frequency loudness perception," J. Acoust. Soc. Am. 140, 3799-3810. (https://doi.org/10.1121/1.4967295)
- Jurado, C. A. (2011). "Behavioral estimates of human frequency selectivity at low frequencies," Ph.D. Thesis, Aalborg University. (VBN link - Aalborg University)
- Jurado, C. A., Moore, B. C. J., and Pedersen, C. S. (2011). "Psychophysical tuning curves for frequencies below 100 Hz," J. Acoust. Soc. Am. 129, 3166-3180. (https://doi.org/10.1121/1.3560535)
- Marquardt, T., and Jurado, C. A. (2011). "The effect of the helicotrema on low-frequency cochlear mechanics and hearing," in What Fire is in Mine Ears: Progress in Auditory Biomechanics, edited by Shera C.A., and Olson E.S. (American Institute of Physics, Melville, NY). (https://www.researchgate.net/publication/253962482_The_Effect_of_the_Helicotrema_on_Low-Frequency_Cochlear_Mechanics_and_Hearing)
- Jurado, C. A., and Moore, B. C. J. (2010). "Frequency selectivity for frequencies below 100 Hz: comparisons with mid-frequencies," J. Acoust. Soc. Am. 128, 3585-3596. (http://asa.scitation.org/doi/10.1121/1.3504657)
Teaching
Supervision
I co-supervise a PhD student (Juan Vizuete) via the University of Málaga, Spain. His thesis is about auditory processing of low-frequencies and infrasound.