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Ergot has been known and used for many centuries, and it was even described in an Assyrian tablet as the "noxious pustule in the ear of grain." In ancient times ergot was also known as "mad grain" and "drunken rye." Then later in European history, there were periodic plagues, which had many symptoms, depending on the dosage of ergot. The possible effects were (mild to severe): (1) burning and convulsions, (2) hallucinations with imaginary sounds, (3) gangrene and loss of limbs, (4) permanent insanity, and, occasionally, (5) death. The initial burning sensation led to the Latin name ignis sacer, which means holy fire. This human malady was so horrible that in 1093 a religious order was founded in southern France to help those afflicted; St. Anthony was the patron saint, so the malady, now called ergotism, was then named St. Anthony's fire.
What are examples of imaginary sounds? - Quora
Frequency, sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself. A drum beat has a much lower frequency than a whistle, and a bullfrog call has a lower frequency than a cricket. The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz, although we lose the highest frequencies as we age. Frequencies above 20,000 Hz are known as ultrasound. When your dog tilts his head to listen to some seemingly imaginary sound, he is tuning into ultrasounic frequencies, as high as 45,000 Hz. Bats can hear at among the highest frequencies of any mammal, up to 120,000 Hz. They use their own ultrasonic vocalizations as sonar, enabling them to pursue minute insects without the benefit of light and simultaneously avoid smacking into immovable objects.