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It is a common understanding in psychoacoustics that the ear cannot respond to sounds at such high frequency via an air-conduction pathway, so one question that this research raised was: does the hypersonic effect occur via the "ordinary" route of sound travelling through the air passage in the ear, or in some other way?
Ultrasound imaging or sonography is often used in medicine. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles. [2]
Electronic pest control is the name given to any of several types of electrically powered devices designed to repel or eliminate pests, usually rodents or insects. Since these devices are not regulated under the Federal Insecticide, Fungicide, and Rodenticide Act in the United States, the EPA does not require the same kind of efficacy testing that it does for chemical pesticides.
When one pup is separated from their littermates, they will produce ultrasonic vocalizations at high rates. [8] Compounds including benzodiazepines , which are positive modulators of GABA receptors , will decrease the production of ultrasonic vocalizations which are emitted in response to social isolation .
I said congratulations to a couple cause the doctor said the ultrasound looked good. They were there to make sure the miscarriage didn't cause any permanent damage. Image credits: Menlo Parker
Ultrasonic hearing is a recognised auditory effect which allows humans to perceive sounds of a much higher frequency than would ordinarily be audible using the inner ear, usually by stimulation of the base of the cochlea through bone conduction. Normal human hearing is recognised as having an upper bound of 15–28 kHz, [1] depending on the person.
This can be done with either a blood test or another ultrasound exam to visually count the number of follicles (i.e., the small fluid-filled sacs that hold one mature egg) on the ovaries.
This causes the device to emit high frequency noise which is uncomfortable to the cats, and inaudible to most humans (although they can still experience unpleasant subjective effects and, potentially, shifts in the hearing threshold [1]). The devices are available in both battery and mains operated forms, the latter generally having a higher ...