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Human hearing depends on hands

29.10.2012

A new study on the connection between motor skills and perception shows that the right and left hemispheres of the brain hear differently. This study, conducted by scientists from Georgetown University, not only uncovers another brain mystery, but may also help treat speech disorders in children and people who have had a stroke. The study demonstrates for the first time a difference in the processing of audio information by the right and left hemispheres of the brain, although a number of experiments have already pointed to this feature.

The scientists found 24 volunteers and let them listen to fast and slow-changing sounds and background noises. The subjects were then asked to indicate by pressing a button whether they heard sounds hidden in the background noise or not. In this case, each volunteer had to use the right hand to press the button for the first 20 sounds, and then the left, and so on in turn.

As a result, it turned out that when people used their right hand, they heard fast-changing sounds better, and when they used the left, on the contrary, slower ones. Since the left hemisphere controls the right hand, and vice versa, the results of the experiment show that the two hemispheres specialize in different kinds of sounds. The left hemisphere "likes" fast-changing sounds, such as letters, while the right hemisphere loves slow-changing sounds, such as syllables or intonations. The connection between the motor system and perception is also clearly visible. In general, the conclusion is the following: most likely speech is processed mainly in the left hemisphere due to the fact that it specializes in the analysis of very rapidly changing sounds.

The fact is really amazing. Imagine that you are listening to a speech at a rally and are waving a flag at the same time. So, the perception of speech will differ depending on which hand you hold the flag in. Ultimately, the scientists hope that understanding the organization of human sound perception and its interaction with the motor system will help explain why speech is processed in the left hemisphere and how to deal with speech impairments.

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