Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Paying attention as the eyes move

06.03.2018

The visual system optimally maintains attention on relevant objects even as eye movements are made, shows a study by the German Primate Center

During daily life, we routinely pay attention to a few important objects in our visual scene. We are even able to do this while we make eye movements to monitor the rest of the scene. Just as moving a camera moves the location of objects within the camera’s display, each eye movement moves the representation of the visual scene on the retina (the eye’s receptor surface).


Cartoon demonstrating that different neurons represent an attended stimulus across an eye-movement.

Image: Tao Yao


Tao Yao, first author of the study and former PhD student at the Cognitive Neuroscience Laboratory, DPZ.

Photo: DPZ

Neuroscientists Tao Yao, Stefan Treue and B. Suresh Krishna from the German Primate Center (DPZ) in Göttingen, Germany, wanted to understand the neural mechanisms that allow us to maintain attention on important objects even as the visual representation moves on the retina with each eye movement.

Their study shows that the rhesus macaque’s brain quickly and efficiently shifts attention with each eye-movement in a well-synchronized manner. Since humans and monkeys exhibit very similar eye-movements and visual function, these findings are likely to generalize to the human brain. These results may help understand disorders like schizophrenia, visual neglect and other attention deficit disorders (Nature Communications).

The human (and monkey) eye can be conceived as acting like a camera: light enters the eye and falls on the retina, where it is converted into neural activity that is interpreted by our brain to provide us with a sense of vision. The central part of the retina is specialized for more sensitive, higher-definition vision than the border areas.

During natural vision, we therefore scan the scene by moving our eye two to three times every second so that its center falls on different parts of the scene. At the same time, we also maintain our attention on important parts of the scene: for example, a mother may look around the world even as she continues to pay attention to her child. Paying attention to the child requires that the brain enhances the processing of neurons that respond to the child.

However, this poses a challenging problem for the brain when eye-movements are made, because with each eye-movement, the image of the child falls on a different location on the retina. Since different locations on the retina stimulate different visual neurons in the brain, this means that one set of visual neurons responds to the child before the eye-movement, while a different second set of neurons responds to the child after the eye-movement.

Thus, to optimally maintain attention on the child, the brain has to enhance the responses of the first set of neurons right until the eye-movement begins and then switch to enhance the responses of the second set of neurons right around when the eye-movement ends. However, whether attention switches are fast and well-synchronized with eye-movements is not known, since the time-course of the switch of attentional enhancement had never been measured until now.

In order to address this, neuroscientists Tao Yao, Stefan Treue and Suresh Krishna of the German Primate Center (DPZ) examined the responses of many single neurons in the brain of two rhesus monkeys while they attended to a stimulus without directly looking at it and made an eye-movement while maintaining attention on this stimulus. To measure the activity of single neurons, the scientists inserted electrodes thinner than a human hair into the monkey’s brain and recorded the neurons’ electrical activity.

Because the brain is not pain-sensitive, this insertion of electrodes is painless for the animal. By recording from single neurons in an area of the monkey’s brain known as area MT, the scientists were able to show that attentional enhancement indeed switches from the first set of neurons to the second set of neurons in a fast and saccade-synchronized manner. Attentional enhancement in the brain is therefore well-timed to maintain spatial attention on relevant stimuli, so that they can be optimally tracked and processed across saccades.

“Our study shows how the primate brain is able to ideally keep paying attention to relevant objects even while making frequent eye-movements”, says Tao Yao, first author of the publication. It supports the idea that the visual attention system and the eye-movement system operate in a synchronized, well co-ordinated manner. “Our results answer several important questions about how the sensory and motor parts of the brain interact and co-ordinate with each other. Also, because co-ordinated sensorimotor function is known to be impaired in schizophrenia, visual neglect and other brain disorders, our results may help improve our understanding of these diseases”, Tao Yao comments on the findings.

Original publication

Tao Yao, Stefan Treue and B. Suresh Krishna: Saccade-synchronized rapid attention shifts in macaque visual cortical area MT. Nature Communications, doi 10.1038/s41467-018-03398-3


Contact

Dr. Dr. med. Suresh Krishna
Tel: +49 551 3851-354
E-mail: skrishna@dpz.eu

Dr. Susanne Diederich (Communication)
Tel: +49 551 3851-359
E-mail: sdiederich@dpz.eu

Printable Images

Printable images are provided by the DPZ’s public relations department or may be downloaded from the photo database of our website. In case of publication, please send a copy or a link as reference.

The German Primate Center (DPZ) in Göttingen, Germany, conducts basic research on and with primates in the areas of infectious diseases, neurosciences and organismic biology. In addition, it operates four field stations abroad and is a competence and reference center for primate research. The DPZ is one of the 93 research and infrastructure institutions of the Leibniz Association in Germany.

Weitere Informationen:

http://medien.dpz.eu/webgate/keyword.html?currentContainerId=4301 - Printable pictures
http://medien.dpz.eu/webgate/keyword.html?currentContainerId=4301 - Press release on DPZ website

Dr. Susanne Diederich | idw - Informationsdienst Wissenschaft

More articles from Life Sciences:

nachricht Molecular evolution: How the building blocks of life may form in space
26.04.2018 | American Institute of Physics

nachricht Multifunctional bacterial microswimmer able to deliver cargo and destroy itself
26.04.2018 | Max-Planck-Institut für Intelligente Systeme

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Why we need erasable MRI scans

New technology could allow an MRI contrast agent to 'blink off,' helping doctors diagnose disease

Magnetic resonance imaging, or MRI, is a widely used medical tool for taking pictures of the insides of our body. One way to make MRI scans easier to read is...

Im Focus: BAM@Hannover Messe: innovative 3D printing method for space flight

At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.

Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...

Im Focus: Molecules Brilliantly Illuminated

Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.

Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...

Im Focus: Spider silk key to new bone-fixing composite

University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.

Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

World's smallest optical implantable biodevice

26.04.2018 | Power and Electrical Engineering

Molecular evolution: How the building blocks of life may form in space

26.04.2018 | Life Sciences

First Li-Fi-product with technology from Fraunhofer HHI launched in Japan

26.04.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>