The brain more obeys the finger to the eye
In a few weeks, the brain adapts to a vision, in involving the specific circuits. A new body image is thus rebuilt, centered on hand.
It is well known, the man adapts remarkably to a disruption of its visual cues. Thus, if a lens is placed before the eyes, the brain is organised quickly that in this “world upside down”, the sensory perceptions remain consistent. But how is this adaptation? To find out, Japanese researchers conducted an original experiment on four students.
Hands on the secrets of the brain
For a month, the volunteers (two girls and two boys, all right-handed) brought glasses permanently to prisms. Regularly, they were subjected to Visual and motor tests and their brain activity was recorded by a MRI (magnetic resonance imaging). Banco! With these careful reviews, the researchers broke the secret. A secret that takes in hand. It is indeed a new representation of the hand that will allow Visual and motor adaptations necessary to the correct perception of the space. In fact, it is as if the brain, seeking a particular circuit, is forged a new body image, whose hand would be the first marker.
A comfortable on a bike a month
Dizziness, nausea, falls… The beginning of the experience was painful for the poor students. They were also much sleep in the early days, both their brains had to recover from the extra work. A month later, all were able to drive a bicycle, something complex, proving their adaptation perfect to the new situation. At the same time, the researchers conducted two tests.The first, simple, was to reach a target in different positions, with right or left hand. The volunteers took about 3 weeks to achieve. Reaction time stayed longer for the left hand, not Director.
A new representation of the hand
More complex, the second test was designed to assess body representation. To do this, the subjects were asked to identify as right or left of the cliches of hand made from various angles. Here, three weeks were required to ensure that volunteers are the correct answers to prior to the experiment, suggesting that they were part of a new representation of their hand. As previously, the results were better for the right hand to the left. At this stage of the experiment, volunteers were able to visualize the hands of two ways: either reviewing the old representation, either directly using the new. It is in this last they chose more spontaneously, despite a long reaction time.
The double game of the brain
Obvious conclusion, students have acquired a dual perception, with, sometimes conflict. “Is like returning to a place where you had to speak Japanese and go in a country where everyone speaks English”, translated Sukiyaki, one of the authors. The cliches in MRI functional, which show the active areas of the brain, this double game of the brain has even been observed directly. Addition to areas normally enabled for Visual and motor processes, new brain areas (of the parietal and frontal lobes) are specifically engaged in adaptation.
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