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On the vortex dynamical contribution to the emission of infrasound from tornadoes.
J Acoust Soc Am
August 2024
Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Article Synopsis
- Field experiments indicate that tornadoes can emit infrasound detectable between 0.5 and 10 Hz.
- The exact methods by which tornadoes generate sound are still not entirely clear, but various theories exist.
- This study uses vortex sound theory to analyze two tornado simulations, revealing that low-frequency sounds come from simple rotation of vorticity, while high-frequency sounds result from more complex vortex interactions like merging.
Inhibition of astroglial hemichannels ameliorates infrasonic noise induced short-term learning and memory impairment.
Behav Brain Funct
December 2023
Department of Rehabilitation Medicine, The China-Japan Friendship Hospital, No.2 Ying Hua Yuan East Street, Beijing, 100029, People's Republic of China.
As a kind of environmental noise, infrasonic noise has negative effects on various human organs. To date, research has shown that infrasound impairs cognitive function, especially the ability for learning and memory. Previously, we demonstrated that impaired learning and memory induced by infrasound was closely related with glia activation; however, the underlying mechanisms remain unclear.
View Article and Find Full Text PDFTemporal integration of infrasound at threshold.
PLoS One
August 2023
Department of Experimental Audiology, Otto von Guericke University Magdeburg, Magdeburg, Germany.
Infrasounds are signals with frequencies below the classical audio-frequency range, i.e., below 20 Hz.
View Article and Find Full Text PDFHearing in helmeted guineafowl (Numida meleagris): audiogram from 2 Hz to 10 kHz and localization acuity for brief noise bursts.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol
January 2024
Department of Psychology, University of Toledo, Toledo, OH, USA.
Behavioral hearing thresholds and noise localization acuity were determined using a conditioned avoidance/suppression procedure for three Helmeted guineafowl (Numida meleagris). The guineafowl responded to frequencies as low as 2 Hz at 82.5 dB SPL, and as high as 8 kHz at 84.
View Article and Find Full Text PDFWired for sound: The effect of sound on the epileptic brain.
Seizure
November 2022
Consultant Neurologist & Honorary Clinical Associate Professor of Neurology, Department of Neurology, Leeds General Infirmary, Great George Street, Leeds LS1 3EX, UK. Electronic address:
Article Synopsis
- Sound waves, audible and inaudible, play a vital role in human interaction and can influence brain activity, particularly in conditions like epilepsy where abnormal brainwave patterns lead to seizures.
- Studies have shown mixed results on the effects of classical music, specifically Mozart's works, in reducing seizures, with varying clinical outcomes and ongoing research into how specific auditory features may provide therapeutic benefits.
- Additionally, low intensity focused ultrasound is being researched as a non-invasive treatment for epilepsy, but more large-scale human trials are needed, and there is currently no research examining the potential effects of inaudible infrasound on individuals with epilepsy.
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