The new research, published today (4 August 2008) in the Proceedings of the National Academy of Sciences (PNAS), studies why the human brain has difficulty perceiving fast moving objects coming from straight ahead; something that should be a key survival skill.
The research has implications for understanding how top-class sportspeople make decisions about playing a shot but could also be important for improving road safety and for the development of robotic vision systems.
The information that the brain uses to process moving objects and to estimate their likely trajectory - which can then be used to decide whether to move out of the way or how to play a shot or catch a ball - is biased by the generally slow moving world around us. Dr Andrew Welchman, a Biotechnology and Biological Sciences Research Council (BBSRC) David Phillips Fellow, has discovered that this bias affects the way we perceive and interpret objects approaching from dead ahead far more than objects moving side-to-side in our field of vision.
Dr Welchman explains: "We may think we live in a fast moving, hectic world, but statistically our environment moves around us slowly. Apart from the odd speeding car, buildings, landscape and walls around us all move past us at slow and predictable speeds. Our brains are constantly building up a statistical picture of the world around and, based on experience, it is a statistically slow world.
"When an object moves quickly - be it a football, cricket ball or, for our ancestors, a spear - our brains have to interpret the movement rapidly and, because our brains draw on experience, it's often biased by what it already knows. The less certain we are about what we see, the more we are influenced by the brain's statistical assumptions, which means in some circumstances we get it wrong."
The human visual system can interpret sideways movement better than it can the movement of objects straight towards us, and this affects our judgments about objects coming our way. Working with colleagues at the Max Planck Institute in Tuebingen, Germany, Dr Welchman developed a mathematical model to show how the brain predicts the motion of an incoming object and tested this with experiments. His model shows that our previous experience of the world around us guides our perception more for objects that come straight towards us than when objects move sideways. The result of this is that approaching objects can look slower than they are and we can believe and object will miss us when actually due to hit us.
Dr Welchman said: "Although it is not surprising that sportsmen who practice a lot build up a better statistical picture in their minds about where a ball might go, it is surprising that what should be a vital survival skill is based on such a trial and error learning experience."
The research has serious applications beyond the world of sports. Motorists driving in poor visual conditions such as fog often drive too fast for the conditions because they judge speed inappropriately. The poor visual information produced by fog means the brain relies more on its assumption that the world moves slowly, so the car's motion is judged slower than it actually is.
Dr Welchman said: "The research also has important long term application to robotics and assistive technologies. Capitalising on nature's design is a good way of building artificial visual systems for robots - as humans get visual judgments right a lot more often than the best current robot systems. Further, knowing the situations in which humans get it wrong is a useful starting point for the design of assistive devices to help correct those errors before they have serious consequences."
Further reports about: > BBSRC
Climate change and air pollution damaging health and causing millions of premature deaths
30.11.2018 | International Institute for Applied Systems Analysis (IIASA)
Reading rats’ minds
29.11.2018 | Institute of Science and Technology Austria
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.
Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...
New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals
Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.
Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.
Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...
Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.
The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.
06.12.2018 | Event News
03.12.2018 | Event News
28.11.2018 | Event News
07.12.2018 | Life Sciences
07.12.2018 | Materials Sciences
07.12.2018 | Physics and Astronomy