Listening to speech with a guinea pig-to-human brain-to-brain interface

Scientific Reports volume  11, Article number: 12231 (2021 ) Cite this article

Nicolelis wrote in his 2003 review on brain-machine interfaces (BMIs) that the design of a successful BMI relies on general physiological principles describing how neuronal signals are encoded. Our study explored whether neural information exchanged between brains of different species is possible, similar to the information exchange between computers. We show for the first time that single words processed by the guinea pig auditory system are intelligible to humans who receive the processed information via a cochlear implant. We recorded the neural response patterns to single-spoken words with multi-channel electrodes from the guinea inferior colliculus. The recordings served as a blueprint for trains of biphasic, charge-balanced electrical pulses, which a cochlear implant delivered to the cochlear implant user’s ear. Study participants completed a four-word forced-choice test and identified the correct word in 34.8% of trials. The participants' recognition, defined by the ability to choose the same word twice, whether right or wrong, was 53.6%. For all sessions, the participants received no training and no feedback. The results show that lexical information can be transmitted from an animal to a human auditory system. In the discussion, we will contemplate how learning from the animals might help developing novel coding strategies.

It is a human dream to communicate directly from brain-to-brain, control machines by direct brain-to-machine connections, or use devices serving as an input to the neural system1,2,3,4. Especially, brain-to-brain communication is intriguing and has been tried successfully in the past. Previous human-to-human or human-to-animal interfaces used various, non-corresponding brain areas or sensory systems to show information transfer between the brains.

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