It is based on six distributed contact electrodes that measure brain signals on the scalp. The voltage produced is strong enough to reliably extract EEG potentials in the microvolt range.
Before measuring can be undertaken, ordinary EEG devices have to be mounted on the patients head in a lengthy, time-consuming process. The single electrodes have to be filled with electrolyte gel to achieve electrical contact with the scalp. Setting up such a device takes about 30 minutes. Fraunhofer Scientists now present an alternative that shortens the process to about two minutes.
For this purpose, the scientists constructed a flexible helmet with six electrode arrays (multiple pins arranged in electrode sockets) as well as one reference electrode. The prototype will be used mainly for research purposes - especially in the field of Brain-Computer Interfaces (BCIs). In BCIs, brain signals are measured by means of an EEG, then classified and converted into control signals for the computer. Test persons can think about moving their right or left hand and then cause a cursor on a computer screen to be moved, just by using their imagination. At the NIPS, Fraunhofer researchers demonstrate for the first time how a BCI can be used with a dry electrode cap. A volunteer test person controls a computer game by means of his brain signals.
Preceding the presentation the scientists conducted a study with five healthy test persons. It was published in the scientific journal PLoS ONE. The study aimed at comparing the performance of a standard 64-electrode EEG with the new dry cap. The prototype was an average of 30% slower than the standard device (9,6 vs 14,9 bits/m), but performed just as well as the standard gel-based cap in terms of of maximum transmission rate (36,5 rsp.35,4 bits/m) and reliability (94, 5 rsp. 98% correctly analysed signals). This opens up new perspectives, especially for research in Brain-Computer Interfaces and the use of BCIs for severely disabled patients.
Approximately 1.3 million Euros in funding is being provided for the development of the dry cap under the EU's 6th Framework Programme for Research and Technological Development in connection with the Brain2Robot project.We will happy to comply you with picture material on request. Further information is available from:
Mirjam Kaplow | idw
Stable magnetic bit of three atoms
21.09.2017 | Sonderforschungsbereich 668
Drones can almost see in the dark
20.09.2017 | Universität Zürich
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy