Neuroscience, tCS and EEG blog

SSVEP-Based Brain Conputer Interfaces

Posted by David Ibañez on Sep 22, 2014 9:53:00 AM

As I explained in one of my previous posts, a Brain Computer Interface (BCI) is a direct communication pathway connecting the brain to a computer or other external device. BCIs do not depend on the brain’s normal action pathways through peripheral nerves and muscles. This makes them the ideal technology to develop systems assisting or repairing human cognitive or sensory-motor function. There are a varieity of different BCI modalities although the most commonly used are motor imagery, P300 and steady state visual evoked potentials. In this post I’d like to focus on SSVEP describing SSVEPs themselves, SSVEP-based BCI systems and presenting the most commonly used SSVEP detection methodology. SSVEP-based BCIs offer two main advantages over other BCIs: they have a larger information transfer rate, and they require a shorter calibration time.

Let’s start introducing what SSVEPs are. Steady state visual evoked potentials are a resonance phenomenon occurring in the brain that can be measured in the EEG. It occurs when a person is focusing his/her visual attention on a flickering light source. When SSVEP is elicited, oscillatory components can be observed in the EEG that match the stimulation frequency and its harmonics. This effect is mainly observed in the visual cortex, the part of the cerebral cortex responsible for processing visual information, shown in the next figure.

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Topics: SSVEP

Brain-to-brain communication

Posted by Giulio Ruffini on Sep 10, 2014 5:44:00 PM

Some would say that my mom is a bit eccentric … When we were little, she would have us play a fun game ... well, I remember this happening at least once probably around 1975. The game was … telepathy. My siblings and I would sit around for a while trying to transmit each other thoughts. Could we transmit words to each other? Concentrate hard and … 

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Topics: brain computer interface, brain stimulation, affective computing, experiment, eeg techniques, basics of eeg, databases, basic neuroscience, liveness detector, neuromarketing

On the importance of negative results

Posted by Anton Albajes-Eizagirre on Sep 1, 2014 10:51:08 AM

This blog has included a fair amount of posts about research studies, as well as about tools, procedures and tips. With all this content, we intend to give you all the ingredients to enter the fascinating world of research and applications of applied neuroscience. 
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Topics: brain computer interface, applications of eeg, brain stimulation, basic neuroscience

Quick and Dirty Guide on Transcranial Current Stimulation

Posted by Aureli Soria Frisch on Aug 17, 2014 9:36:00 PM

While heading to Petronas Technology University where I will give a course on transcranial current stimulation (tCS) basics I summarized the basics of the technology and particularly on Starstim, the device we envisioned and started to develop within the HIVE project. tCS devices allow the controlled injection of low-amplitude electrical currents into the cerebral cortex through the electrodes, which are non-invasively placed on the scalp. In this sense they play the opposite role to EEG, i.e. not for monitoring brain activity but for modifying it. There has been some advancement in the tCS field, but the technology and its effects on the brain are still not fully understood. Well, the effects are showing up more and more as studies and clinical trials increase. As a matter of fact, publications on tCS have multiplied by a factor of 4 in the last 4 years, and the clinical trials involving it, even by a factor of 10. But what is still not really understood is what causes this effect from both an electrophysiological as well as therapeutic point of view. I would like to comment on the electrophysiological effects giving some quick hints on what makes the applied electrical current affect the brain activity at the neuronal level. The state of the art is far from this understanding on its effects at neuronal population level and at a global brain level, i.e. connectivity, which have been much less studied.  

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Top coolest applications of BCI and Neuroestimulation in the movies

Posted by Alejandro Riera on Jul 15, 2014 1:14:00 PM

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Topics: brain computer interface, applications of eeg, brain stimulation, affective computing, emotion detection, emotion elicitation, biometrics, Neuroscience

Vision-based emotion recognition

Posted by Javier Marin on Jul 1, 2014 10:47:00 AM

How many times would you have liked to know what the person in front of you was feeling? Perhaps, you were criticizing a specific brand in an interview, and the guy just in front of you was a self-devoted user of this brand. Or the other way around: the interviewer was interested on knowing what your feelings were regarding a specific issue during the interview. How useful would an emotion recognition system have been in those situations?

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Topics: applications of eeg, emotion detection, emotion elicitation, Neuroscience, experiment, eeg, neuromarketing

The Social Brain

Posted by Stephen Dunne on Jun 26, 2014 2:57:00 PM

We all know that we are extremely social animals but just how far does this go? Many believe that human intelligence evolved to solve our complex social problems rather than ecological problems as was previously assumed. Robin Dunbar lays this out in his 1998 paper “The Social Brain Hypothesis”. You may have heard of Dunbar’s Number, which refers to the number of people we can reasonably maintain relationships with, and it is directly related to our social processing power. In fact the number of individuals in various primates social groups and how this correlates to the size of their respective neocortex is in part what drove this theory.

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Topics: applications of eeg, experiment, eeg, Science

Why some people can sleep easily with noise and others just can´t?

Posted by Alexis Vegas on Jun 20, 2014 10:01:00 AM

Rest is a determining factor in human life, necessary and essential to stay productive the entire day. However, sometimes there are some external noises such as thunderstorms, music or even vehicles that keep us from sleeping. But ... do these noises affect us all equally? Are we all aware of these sounds?

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Topics: applications of eeg, experiment, eeg, basics of eeg, eeg analysis, Brain, Science, sleep

Spoofing biometric systems or just trying?

Posted by Javier Acedo on Jun 3, 2014 8:43:00 AM

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Topics: biometrics, eeg, ECG, spoofing attack, liveness detector

HORIZON 2020 and Neuroscience

Posted by Anna Puig-Centelles on May 27, 2014 11:03:00 AM

 Horizon 2020
is the biggest EU Research and Innovation programme ever with nearly €80 billion of funding available over 7 years (2014 to 2020) – in addition to the private investment that this money will attract. It promises more breakthroughs, discoveries and world-firsts by taking great ideas from the lab to the market.

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Topics: Neuroscience, Brain, Science, Horizon2020, Neuro, Horizon