Humans Trained to Use Echolocation with Tongue Clicks
Source: Axel Kock / fotolia.com
Wiegrebe and his colleagues have developed a technique based on functional magnetic resonance imaging (fMRI), which makes it possible, for the first time, to monitor the process of echolocation by means of self-generated tongue clicks.
The set-up used for the experiment also allowed the neuronal mechanisms involved in echolocation to be characterized with the aid of the MRI scanner. “Echolocation requires a high degree of coupling between the sensory and the motor cortex,” Virginia Flanagin says. The sound waves generated by the tongue clicks are reflected by the surroundings and picked up by both ears, thus activating the sensory (auditory) cortex. In sighted subjects, this is followed shortly afterwards by activation of the motor cortex, which stimulates the tongue and the vocal cords to emit new clicking sounds.
The researchers now plan to develop a dedicated training program, which enables blind persons to learn how to use tongue clicks for the purpose of echolocation.
Contacts and sources:
Citation: The Journal of Neuroscience 2017
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