I don’t know if you have already heard about the human echolocation phenomenom. For those of you who haven’t, this post’s title probably has left you a bit astonished, but human echolocation in an ability that has been known for at least the 1950s.
We could say that human echolocation its a process similar, in a way, to the one used by bats, dolphins and some whales to recognise their surroundings and location. Equally to the way a sonar works using sound echoes to recognise objects.What we normally see is just the light reflection on an objects surface, that gives us the trace, form and size of what we are looking at. Evolution has developed eyes as light “sensors” and eyes plus their brain connections provides us with a really powerful tool to cope with the environment, walk around, be able to recognise objects, enabling easy space positioning. In contrast we could define human echolocation as the ability of humans to detect objects in the environment by sensing echoes from those objects by actively creating sounds, for example by making clicking noises or tapping a cane. People trained to orientate with echolocation are able to interpret the sound waves reflected by nearby objects, accurately identifying their location and size, so this ability is used by some blind people to navigate within their environment using their auditory senses rather than their visual ones.
Vision and hearing are closely related in that they can process reflected waves of energy. Both systems can extract a great deal of information about the environment by interpreting the complex patterns of the reflected energy they receive. Sound carries information about the nature, arrangement of objects and other environmental features. Giving information about location, dimension and density of the object the sound reflects from.
It has been recently shown that blind echolocator’s experts use what is normally the “visual” part of their brain to process the echoes, primary visual cortex. Most interestingly, the brain areas that process auditory information were not activated in this subjects, in the performed experiments, more than in other normal subjects. Which gives the idea that blind echolocator’s experts sense the world similarly the way other people do, but using a completely different strategy for information gathering.
When talking about human echolocator’s, we must mention Daniel Kish, born in 1966 in Montebello, California. Blind since he was 13 months old, he is an expert in human echolocation and president of World Access for the Blind, a non-profit founded in 2000 which helps people with all forms of blindness. Kish and his Organisation have taught echolocation to at least 500 blind children around the world inspiring other scientists to study human echolocation. Other remarkable human echolocator’s are Lucas Murray from Poole, Dorset. Who was born blind and was one of the first british people to learn to visualise his surroundings using human echolocation, taught by Daniel Kish and Ben Underwood (1992-2009)
The human brain continuous to embrace incredible features, evolution was the great tool that boosted its creation and guides its capabilities. Do we use the hole capabilities of our brain? The most reasonable option is that we must use most of them. Brains are expensive organs in terms of energy costs and I believe it is reasonable that our evolution would’t have allowed those nonsense great energy expenses. So I believe that if we weren’t using our hole brain, the brain would had probably shrunken. There is an example of this. When talking about some type of birds, while mating season, the male which is the one who searches for food, has to remember where the best food is and where the nest is in order to return to it with the food, so it’s brain is bigger than the female one, which does not have to gather this knowledge. But is incredible to realise, that when not on mating season, when the birds do not have to remember where is easy to find lots of food and how to return to the nest, the male brain shrinks. In order to lose less energy, and when back on mating season the male’s brain expands again.
Do we use the brain the only way it can be used? I believe this is a totally different question, I believe perception is the key fact, usually missing when trying to understand cognition. Human echolocators do not “hear” the echoes as we would do it, they really” see” the sound reflected from the objects, I mean, their brain constructs the image the same way we do, but using sound instead of light. Obtaining at the end very similar results from evolution’s point of view which is, at the end, helping the entity surviving in the environment. So I believe that only time will tell if there are totally different ways of using our brain, but we must be always really open minded for any new ways of thinking that will surely arise in the future.
At last I would like to mention Kevin Warwik, born the 9th of february in 1954 in Coventry, Uk. Is a British scientist and professor of cybernetics at the University of Reading. He is well know for his studies on direct interfaces between computer systems and the human nervous system. Has done interesting researches in echolocation’s field. Kevin Warwik is an incredible scientist, related with cognition and artificial intelligence and deserves a future entrance in this blog, so for now I will only talk about his particular conception with respect to artificial intelligence, he claims that we have many limits, such as our sensorimotor abilities, that we can overcome with machines. In his own words:
“There is no way I want to stay a mere human”
I would like to add to this blog entrance this documentary on Ben Underwood (1992-2009) and the human echolocation phenomenon. Not only for the scientific purposes but also for telling his beautiful biography of overcoming and struggle. When this was recorded he was still alive. Hope you enjoy it.