A research team led by Martin Rolfs at the Bernstein Center and Humboldt University Berlin, has now revealed that these judgments arise from fundamental visual processes – without involving higher cognitive reasoning. They showed that, with prolonged viewing of causal events, an adaptation process takes place that resembles those observed in the perception of size, color, or motion of an object. The result ends a long-standing debate about the level at which higher-order properties of visual events are computed.
The hand hits a glass, it falls over, and the milk spills over the kitchen table. The observer is immediately sure that it was the clumsy hand that caused this little mishap. Until now, researchers have disagreed whether this causality judgment depends on higher brain functions such as cognitive reasoning, or whether it emerges at an earlier stage during perception, similar to the evaluation of size, color, or motion of an object. An international team of researchers including Martin Rolfs at the Bernstein Center Berlin, Michael Dambacher at the University of Konstanz, and professor Patrick Cavanagh at the University Paris Descartes has now found the answer to this question: Rapid causality judgments are made at the level of visual perception.
In their study, participants watched a repeating video clip in which one disc moved towards another, and the latter disc started to move after being touched by the first. Instead of seeing one disc stopping and the next disc starting to move, both events are seen as one continuous action where the first disc launches the second – similar to colliding billiard balls. Rolfs and his colleagues have now demonstrated that after the repeated observation of these collision scenes, an adaption process occurs: Subsequent interactions involving two discs are less likely to be seen as causal. Similar adaptation aftereffects are known after the repeated perception of basic properties such as color: After looking at an orange light for a short while, you will see a light blue spot when looking at a white wall. These visual aftereffects suggest a habituation of the populations of neurons in those parts of the brain that analyze these specific qualities.
The main result of the study: The adaptation to collision events was specific to the location where the collisions had been seen. Moreover, when the eyes moved, these adapted locations moved with the eyes, just as the color afterimage shifts as you move the eyes around. According to the researchers, these results show that the neuronal structures involved in the judgment of causality must be part of the early visual process as higher level cognitive processes do not show this specificity to eye position. Main investigator Rolfs: “The result moves functions that have previously been thought of as achievements of cognitive deduction into the realm of basic perception, with implications for fields as diverse as philosophy, psychology, and robotics.”
The Bernstein Center Berlin is part of the National Bernstein Network Computational Neuroscience in Germany. With this funding initiative, the German Federal Ministry of Education and Research (BMBF) supports the new discipline of Computational Neuroscience since 2004 with over 170 Mio. €. The network is named after the German physiologist Julius Bernstein (1835-1017).Contact:
The dense vessel network regulates formation of thrombocytes in the bone marrow
25.07.2017 | Rudolf-Virchow-Zentrum für Experimentelle Biomedizin der Universität Würzburg
Fungi that evolved to eat wood offer new biomass conversion tool
25.07.2017 | University of Massachusetts at Amherst
Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers
Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...
Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
25.07.2017 | Physics and Astronomy
25.07.2017 | Earth Sciences
25.07.2017 | Life Sciences