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Toward self-paced brain-computer communication: navigation through virtual worlds.
The self-paced control paradigm enables users to operate brain-computer interfaces (BCI) in a more natural way: no longer is the machine in control of the timing and speed of communication, but rather the user is. This is important to enhance the usability, flexibility, and response time of a BCI. In this work, we show how subjects, after performing cue-based feedback training (smiley paradigm), learned to navigate self-paced through the "freeSpace" virtual environment (VE). Similar to computer games, subjects had the task of picking up items by using the following navigation commands: rotate left, rotate right, and move forward ( three classes). Since the self-paced control paradigm allows subjects to make voluntary decisions on time, type, and duration of mental activity, no cues or routing directives were presented. The BCI was based only on three bipolar electroencephalogram channels and operated by motor imagery. Eye movements (electrooculogram) and electromyographic artifacts were reduced and detected online. The results of three able-bodied subjects are reported and problems emerging from self-paced control are discussed.
IEEE Trans Biomed Eng. 2008 Feb;55(2):675-82. Scherer R, Lee F, Schlogl A, Leeb R, Bischof H, Pfurtscheller G. Laboratory of Brain-Computer Interfaces, Institute for Knowledge Discovery, Graz University of Technology, Graz 8010, Austria. reinhold.scherer@tugraz.at
When your mind and body are relaxing, they are repairing. The largest part of our nervous system, which runs without your conscious awareness, has two modes. When you are in a deep state of relaxation, you are experiencing what is known as a parasympathetic response. This means that your digestion system and other major life-sustaining organs are fully functioning and your immune system is working at its best. The opposite state is called a sympathetic response. Typically those systems and organs that were operating at their best in the parasympathetic mode are now taking a subordinate role...
Bullying is a condition or situation where one or more people are involved with aggression that is so excessive as cause extreme psychological stress for others. Unfortunately, it is a fact of life in international affairs, politics, organizational dynamics, and with individuals. By its ubiquitous nature it should be obvious that it has always played a role in our society. This, however, does not mean that we should not be concerned.
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