Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

The principle of optical illusions technically imitated

06.11.2017

The human brain must cope with a large variety of information simultaneously so we can orientate ourselves in our environment and make quick decisions. How exactly it processes the gigantic data stream provided by our sense organs has still not been fully researched. For a deeper understanding of how the brain works, scientists at Kiel University attempt to imitate this biological processing of information technically. Now, using the example of optical illusions, the researchers have demonstrated how processes of perception can be copied in an electronic circuit made of nanoelectronic components. Their results have been published in the scientific journal Science Advances.

How an electrical circuit can imitate processes of perception can be particularly well illustrated using optical illusions, i.e. images that convey contradictory information to our perception. An example: at first glance, a drawing shows a normal hippo. But if you look closer, you see that something is wrong.


Marina Ignatov, a doctoral researcher in electrical engineering and lead author of the publication, shows an electronic circuit with which the perception processes of the human brain can be imitated.

Foto/Copyright: Julia Siekmann, CAU


Optical illusions like this one convey conflicting information. The Kiel research team uses them to show how our brain connects information.

Foto/Copyright: AG Nanoelektronik

Some of the hippo’s legs are drawn so that they can neither be clearly assigned to the animal’s body, nor to the background. An optical illusion like this provides so-called "competing information", which is initially confusing for our brain.

On this basis, it is simple to follow how our brain connects pieces of information. "It is quite difficult for people to recognise errors in optical illusions," explained private lecturer Dr Martin Ziegler from the Nanoelectronics working group at the Faculty of Engineering. "Because in general, our brain automatically creates a correct picture - in this case, the complete hippo. We need meaningful information to be able to make decisions quickly."

The key to perceiving both interpretations of the image is concentration. It is one of the central principles our brain works by. Because what we focus our perception on, shapes our image of reality. To clarify this, the Kiel research team coloured the background of the drawing dark. This way they direct your attention to the legs of the hippo in the foreground, making it easier to recognise the incorrectly-drawn feet.

With such perception processes, the frequency with which we identify specific patterns also plays a role: "If I look at the legs of the hippo a hundred times, and only ten times at the background, it is more likely that I will recognise a picture of a complete hippo," explained Marina Ignatov, a doctoral researcher in the Nanoelectronics working group.

Why can we perceive objects?

Behind the interest of research in optical illusions lies a central neuroscientific issue, which is also referred to as the “binding problem”: how does our brain construct a uniform perception from a variety of sensory impressions, and thus recognise objects, for example? Electrical impulses constantly transmit information between neurons in the brain, where there are respective independent networks responsible for vision, sound or touch, for example. In order to consciously perceive things, different areas of the brain must exchange information and re-link themselves again and again.

For this purpose, the activity of neurons is synchronised - i.e. they work in step with each other. This can be seen in people by measuring the electrical activity in the brain (an EEG). "Synchronicity is already recognised as a functional principle of the brain. But we do not yet know how our brain connects its various areas, and thereby constantly changes its sub-networks," explained Professor Hermann Kohlstedt, head of the Nanoelectronics working group. It is believed that factors such as concentration, which we focus on certain objects in our area of perception, lead to information being linked.

Biological processes copied electrically

In order to understand which processes take place during the linking of information, the Kiel research team developed an electronic circuit made of oscillators. This circuit generates periodic voltage pulses in real time, and thereby works similarly to neurons in the brain. The researchers used special nanoelectronic components to link and synchronise the oscillators. These components are known as "memristors" (from the words "memory" and "resistor"). They are able to store electrical states, similar to the processes in the brain which occur during the linking of information.

"The frequency of the electrical pulses which we subject the memristors to is thereby comparable with concentration in the human perception process. The higher the number of pulses, the higher the probability that there is a connection between the artificial neurons," explained Mirko Hansen, a doctoral researcher in the Nanoelectronics working group, and co-author of the publication. The intensity of these connections can be controlled via the memristors. This changes the connections in the electronic network, similar to the constantly adapting synapses between the sub-networks in the brain.

The work originated within the national collaborative research project "Memristive devices for neuronal systems" (Research Group 2093), which is funded by the German Research Foundation (DFG). Here, scientists from the fields of physics, electrical engineering, materials science and medicine work together. "Our long-term goal is to simulate higher brain functions which form so-called cognitive, electronic systems. These can be self-learning systems, for example, which - in the distant future - can maybe even develop something like empathy," said Professor Hermann Kohlstedt, spokesperson for Research Group 2093.

Original publication:
Memristive stochastic plasticity enables mimicking of neural synchrony: Memristive circuit emulates an optical illusion. Marina Ignatov, Martin Ziegler, Mirko Hansen and Hermann Kohlstedt, Science Advances 25 Oct 2017: Vol. 3, no. 10, e1700849, DOI: 10.1126/sciadv.1700849 http://advances.sciencemag.org/content/3/10/e1700849

Photos are available to download:
http://www.uni-kiel.de/download/pm/2017/2017-326-1.jpg
Marina Ignatov, a doctoral researcher in electrical engineering and lead author of the publication, shows an electronic circuit with which the perception processes of the human brain can be imitated. Electrical oscillators assume the function of the neurons. Memristive components are able to store electrical states, and to simulate synapses in the brain which link the nerve cells together.
Foto/Copyright: Julia Siekmann, CAU

http://www.uni-kiel.de/download/pm/2017/2017-326-2.jpg
With this equipment, Marina Ignatov, Hermann Kohlstedt, Mirko Hansen and Martin Ziegler from the Nanoelectronics working group manufacture the memristive components at the Faculty of Engineering.
Foto/Copyright: Julia Siekmann, CAU

http://www.uni-kiel.de/download/pm/2017/2017-326-3.jpg
The memristive components are manufactured on thin silicon discs, so-called wafers. A total of 40,000 memristive components are located on one wafer, which consists of layers of silver, titanium oxide and aluminium, and is able to store electrical states.
Foto/Copyright: Julia Siekmann, CAU

http://www.uni-kiel.de/download/pm/2017/2017-326-4.png
A normal hippo - or are the legs missing? Optical illusions like this one convey conflicting information. The Kiel research team uses them to show how our brain connects information.
Foto/Copyright: AG Nanoelektronik

Contact:
PD Dr Martin Ziegler
Nanoelectronics working group
Research group 2093 “Memristive devices for neuronal systems”
Tel.: +49 (0)431 880-6067
E-mail: maz@tf.uni-kiel.de

Christian-Albrechts-Universität zu Kiel
Press, Communication and Marketing, Dr Boris Pawlowski, Text/editing: Julia Siekmann
Postal address: D-24098 Kiel, Germany,
Telephone: +49 (0)431 880-2104, Fax: +49 (0)431 880-1355
E-mail: presse@uv.uni-kiel.de, Internet: www.uni-kiel.de, Twitter: www.twitter.com/kieluni Facebook: www.facebook.com/kieluni, Instagram: www.instagram.com/kieluni

Further information:
Collaborative research project
„Memristive devices for neural systems“ (FOR 2093):
http://www.for2093.uni-kiel.de

Details, which are only a millionth of a millimetre in size: This is what the research focus "Kiel Nano, Surface and Interface Science – KiNSIS" at Kiel University has been working on. In the nano-cosmos, different laws prevail than in the macroscopic world - those of quantum physics. Through intensive, interdisciplinary cooperation between materials science, chemistry, physics, biology, electrical engineering, computer science, food technology and various branches of medicine, the research focus aims to understand the systems in this dimension and to implement the findings in an application-oriented manner. Molecular machines, innovative sensors, bionic materials, quantum computers, advanced therapies and much more could be the result. More information at http://www.kinsis.uni-kiel.de

Dr. Boris Pawlowski | Christian-Albrechts-Universität zu Kiel

More articles from Life Sciences:

nachricht Climate Impact Research in Hannover: Small Plants against Large Waves
17.08.2018 | Leibniz Universität Hannover

nachricht First transcription atlas of all wheat genes expands prospects for research and cultivation
17.08.2018 | Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

Im Focus: The “TRiC” to folding actin

Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.

Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Smallest transistor worldwide switches current with a single atom in solid electrolyte

17.08.2018 | Physics and Astronomy

Robots as Tools and Partners in Rehabilitation

17.08.2018 | Information Technology

Climate Impact Research in Hannover: Small Plants against Large Waves

17.08.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>