People perceive depth according to their arm`s length
Washington: A new study has found that people have a preferred distance at which they judge depth most accurately. They overestimate depth when objects are closer and underestimate depth when objects are farther away.
In the research on depth perception, the research team, coordinated by Fulvio Domini, professor of cognitive linguistic and psychological sciences at Brown University and senior scientist collaborator at the Istituto Italiano di Tecnologia (IIT) in Italy, has shown that they could manipulate the distance at which adults accurately perceived depth, both through sight and touch, by tricking them into thinking they had a longer reach than they really do.
"When children start touching and playing with things, they don't just do it at any distance. They do it at a small range of distances," Domini said. "Our thought is maybe what the brain does is figure out a metric at that distance and the rest is all heuristic."
That optimal distance where people are most accurate, it turns out, depends on their mind's perception of arm length.
In experiments conducted at IIT with 41 volunteers, those they "trained" to think their arms were reaching farther than they really were subconsciously accepted that fiction and shifted the distance at which they best judge depth farther away.
They also had a finer ability to discriminate between two separate tactile stimuli, in that they could perceive them as distinct with less distance between them than before.
The findings of a role for arm length may help to explain depth perception and the limits of its accuracy, Domini said. In addition, the finding that depth perception can be predictably manipulated by changing perceived arm length could also matter to designers of robotic proxies, exoskeletons, and robotic surgery.
The researchers concluded saying that even in adulthood sensory systems are not fixed structures with immutable functions, they have instead found strong sensory plasticity that can be evoked within minutes in adults.
The study was published in the journal of Neuroscience.
More from India
More from World
More from Sports
More from Entertaiment
- Trump-Sharif conversation: Team Donald denies Pakistan's claims
- Hizbul commander Musa issues threats of attacks in new video
- 'Heart of Asia' Conference begins in Amritsar; Sartaj Aziz to pay a visit on Sunday
- Panel discussion over Mamata Banerjee's false allegations on Indian Army for political gains
- Watch - Parrikar's reply to Mamata's military coup claim
- Gujarat businessman declares highest ever black money amount – Rs 13,000 crore!
- Army proves Mamata Banerjee wrong, releases letter showing West Bengal govt knew of exercise
- Rs 14,000 crore default case: Gujarat businessman detained, says money belongs to politicians, babus
- Manohar Parrikar exposes Mamata's attempt to politicise routine Army exercise in Kolkata
- Scam? 'Aam Aadmi Party using Delhi Transport Corporation to exchange Rs 500, Rs 1,000 notes'