It turns out that the human auditory system can identify the electrical signals produced by the guinea pig's brain
brain-machine interface that connects the brain and computer is being developed using this, as well as between animals. Research is also being conducted on the brain-brain interface that connects the brain. The results of a new experiment in which the guinea pig's brain sends an electrical signal to humans to see if it can understand its contents have been published in the scientific journal Scientific Reports.
Nerve cells of animals, including humans, use electrical signals to transmit various information, and the
Listening to speech with a guinea pig-to-human brain-to-brain interface | Scientific Reports
In recent years, in addition to the brain-machine interface that reads brain activity and directly controls the computer, the brain-brain interface that connects the brains of animals has also attracted attention. In the 2013 experiment , a rat bred in Brazil was made to remember that 'when the lever is pressed when the light is on, water comes out', and a tiny electrode is embedded in the brain and connected to a computer. In addition, electrodes were also embedded in rats bred in the United States, and electrical signals emitted by Brazilian rats were sent via a computer. Then, it seems that American rats were able to push the lever and drink water even though they were not trained.
Also, in the 2019 study, two of the three subjects were 'senders' who sent electrical signals using a electrosurgical meter , and one was a 'receiver' who received electrical signals through transcranial magnetic stimulation. An experiment was conducted in which three people played a game similar to Tetris. In this experiment, only the sender knew the direction in which the stacking blocks should be rotated, and looked at the flashing light at a specific frequency depending on the direction of rotation. Then, when the recipient rotated the blocks by relying on the light signal sent to the brain, it was reported that they succeeded in stacking the blocks with high accuracy.
Connect the brains and share thoughts like telepathy and succeed in Tetris' three-person joint play --GIGAZINE
Past experiments have shown that the brains of animals of the same species can be connected to transmit information, but it was unclear whether information could be transmitted when the brains were connected between different species. Research teams at Northwestern University and New York University decided to experiment with guinea pigs and the human auditory system.
First, the research team asked guinea pigs a specific word and recorded the corresponding electrical signal in the inferior colliculus, an important part of the brain in the auditory system. Next, subjects with hearing loss and wearing a cochlear implant , a device that supports hearing, were given an electrical signal recorded in the guinea pig's brain via the cochlear implant.
A cochlear implant is a device that converts the sound captured by an external microphone into an electrical signal and sends the electrical signal through electrodes that come into contact with the cochlea, the sensory organ that controls hearing. In this experiment, it was investigated how accurately the subject could perceive the electrical signal produced by the guinea pig's brain by replacing this electrical signal with the one processed by the guinea pig's brain.
In the experiment, the research team showed a list of four words after sending an electrical signal to the subject's cochlear implant and asked, 'Which of the four words do you think the sound you just heard fits?' After repeating the trial of asking questions, the subject selected the correct word with an accuracy of 34.8%. In addition, when we investigated the ratio of judging that a specific electric signal transmitted in two times was the same word, it seems that we were able to identify the specific electric signal as the same word with an accuracy of 53.6%.
All of these results outweigh the results of random selection, showing that human subjects can identify the electrical signals generated by guinea pigs who hear the words with some accuracy, the researchers said. I am. It has also been pointed out that some words were easy for the subject to identify and some were not, such as bomb, knife, sun, make, patch, and boat ( The correct answer rate for words such as boat and van exceeded 50%, while the correct answer rate for words such as merge, tough, seize, lease, and knife. Is less than 10%.
The research team commented, 'Voice signals encoded by the animal (guinea pig) auditory system can be decoded by the human auditory system,' and the possibility that lexical information can be transmitted from animals to the human auditory system. Claims that there is. He said the results of this study will lead to improvements in cochlear implants.