US Embassy staff in Havana in Havana made more than half of their employees in 2017, while diplomats complained of headaches, nausea and other diseases after hearing severe noise in their homes and nearby hotels.
The mysterious wave of illness generated speculation that the staff was targeted by acoustic weapon. In Cuba, the continuous, high-strenuous drones audio recordings by US employees were shown to gain weight when the Associated Press was released.
But with the new analysis of audio recording, the UK and the US Scientists now believe what is the true source of piercing day: it is a song of short-tail cricket, which is formally known. Anuragulus Celenrinctus.
Lincoln University's sensational biology professor Fernando Montalegre-Zapata said that "the recording is definitely the cricket associated with the same group." "The call of this Caribbean tribe is approximately 7 kHz, and is delivered at an unusually high rate, which gives a constant sharp emission to humans."
As a child raised in South America, Montalegre-Zappa collects a similar species bay and keeps them in a cage in their room. One night he woke up for a sharp intense voice. The man calling for the offenders was a criminal. The offender was banned from the room but Montalegre-Zapat women could still hear cricket guides.
"I am not surprised that this call can disturb people who are not familiar with the things of the kit," he said.
US Health agency Cuba and China & # 39; Sonic Invasion & # 39; In connection with the investigation is attached
The identity of the voice source does not mean that there is no attack, but it expresses doubt on the sound responsible for the health problems of politics. The reason and nature of their illness are unclear.
US From the perspective of inexperienced health problems among diplomats, the doctors of Pennsylvania University were directed to run tests on nearly two dozen embassy staff. In March last year, the team concluded that diplomats had suffered injuries, but other medical professionals challenged the conclusions, doctors gave wrong definitions of test results.
The affected diplomats did not report unusual voices when they fell ill, and the description of any sound was different from the individual. Some people remember voices like grinding or suspense, while others have experienced side effects from open-air windows.
In a new study, Montenegro-Zappata and Alexander Stubbs of the University of California discovered a scientific database of kit sounds that match the Cuban recordings. The call of indie short-tailed cricket was quite similar, acoustic pulses were repetitive with the same rate and certain frequencies were found to be sharper than others.
But cricket's meeting call and Cuban recordings do not match perfectly. The sound recorded in Havana was an uneven pulse structure that was not seen in the invasion of insects.
Stubbs and Montalegre-Zapata understand that the ambiguity in the recording environment can be reduced. Scientists record wild outdoor insect calls, while the diplomats complained to the inside of the voice. If Cuban recording was done in the room, the exotic pulse structure can be explained by echoes on walls, floors and ceilings.
Cuba is more stretched from the US Embassy's & quot; more likely new & # 39; Sonic illnesses occur
Researchers tested this idea by playing a loud short-tailed cricket call in a room by a loudspeaker. Records from the room show that the sound observed in Cuban recordings achieves uniform unequal pulse structure. Both voices match more closely.
Gerald Poll, in the study of Gereld Pollack, who found out how to discriminate sensational signs in McGill University in Montreal and sensory signs, said: "The paper shows how to do a cricket song, while being considered in the indoor setting, Come, similar to the provided by AP. I think this is a perfect saga Understanding. "
He added that, when he did not have any personal experience with India's short-tailed cricket, he never heard of the damage to his halls. "As far as I am awake," he said, "perhaps without a disappointing night, no one has had bad health as a result of cricket calls."