Why the Blind Have a Superior Sense of Touch

Scientists from the Max Planck Institute for Human Cognitive and Brain Sciences have discovered why blind people tend to have a superior sense of touch.

The team of Robert Trampel and colleagues found that blind people develop the Stripe of Gennari - a bundle of nerve fibers that develops even in those who are blind from birth and does not degenerate - which might contribute to an enhanced sense of touch and support fast reading of Braille.

Blindness in Premature Babies can be Prevented With Drug Avastin
Premature babies who are born before their eyes develop fully carry a risk of blindness, like the case of famous singer, Stevie Wonder.

The Stripe of Gennari - also known as the 'Stria of Gennari' - transverses the gray matter of the primary visual cortex as a distinct white line.

"Although the visual cortex is one of the best-studied parts of the brain, and the Stripe of Gennari is a rather obvious structure, why it develops and what its function is has not previously been studied in detail," said Trampel.

However, the team has found that it can't be the only function of the stripe of Gennari.

Key Mechanisms in Untreatable Blindness Disease Identified
A molecular mechanism implicated in geographic atrophy, the major cause of untreatable blindness in the industrialized world has been identified by researchers of the University of Kentucky.

"This brain structure therefore can't exclusively be involved in vision and must be capable of carrying out other tasks", says Trampel.

In the blind, the Stripe of Gennari could play a role in supporting the sense of touch, the scientists speculate.

Playing Bagpipes Increases Risk of Blindness
Playing bagpipes increases the risk of eye disorders which may lead to blindness.

"This faculty is essential in reading Braille and the region carrying the Gennari-Stripe is known to show an increased activity in the blind when performing this task."

In blind people, the brain uses tactile and acoustic stimuli to construct a rough spatial representation of the surroundings in the absence of visual information. The stripe of Gennari might play a role in this process and could later support highly demanding tactile tasks, like Braille-reading.

Colored Contact Lenses (Courtesy Lady Gaga) Can Cause Blindness
Pop singer Lady Gaga-inspired trend of wearing coloured contact lenses could damage people's eyes, opticians have warned.

The team now aims to learn more about the work of this versatile nerve bundle in the human brain.

The study appears in Cerebral Cortex.

Source-ANI