Last monday, 7th December 2009, I came to another talk in the Cognium building of the University of Bremen. The talk is presented by Prof. Dr. Peter Dayan, from Gatsby Computational Neuroscience Unit, Alexandra House, London. The talk title is "A Bayesian Model of Attentional Load".
I did not understand the talk much. It was about statistic, mostly Bayesian (of course). Basically, we have attention. EEG signals are then classified, based on Bayesian method. I am sorry I really couldn't get the idea of the talk.
I keep the presenter's name and the talk title in order to have a contact if I want to continue Ph.D. next year (2010).
Showing posts with label uni bremen. Show all posts
Showing posts with label uni bremen. Show all posts
Monday, December 14, 2009
Monday, November 16, 2009
The Gamma-Trait
Today (16th November 2009),
I came to a colloquium in COGNIUM building of University of Bremen. The talk is presented by Prof. Dr. Christoph Herrmann, from the "Institut für Psychologie", University of Magdeburg. Actually, he has moved to the "Institut für Psychologie", University of Oldenburg.
The title of the talk is "Der Gamma-Trait: Inter-individuelle Variation der EEG Gamma-Band-Aktivität spiegelt Unterschiede kognitiver Funktionen wider". The title is in German but the talk is in English. So let me translate the title: "The Gamma-Trait: inter-individual variation of the EEG Gamma band activity reflects the differences in cognitive functions."
Gamma band is the EEG frequency above 30 Hz. Most experiments shown are about event-related potential (ERP) of the EEG. The events are created by stimuli: pictures showing pattern. The response is measured by EEG.
I didn't take note in the talk. I also came late.
But I remember a few things from the talk.
***
There are relationship between genes and the cognition.
The certain genes play a role in dopamine production and other neuronal activity.
The dopamine has relationship with Gamma band activity.
Gamma Band activity is generated by certain stimuli.
So the response of human brain or the cognition depends on genes.
It could means that the way we (human) think differently and act so because of our genes.
We were meant to be different from each other. So religious fundamentalism and racism, who hate different others, are really against our nature.
***
Prior knowledge is important.
There are two experiments showing pictures and recording EEG: first experiment is without prior knowledge and second experiment (in the following 2 weeks) is with prior knowledge from the first one. The second experiment always shows a higher Gamma trait.
***
Giving an electric current to your head increase your Gamma trait.
The experiment is done with both DC and AC voltage.
If you think you can get smarter after you have an electric current through your head, you are wrong. The effect of an increase of Gamma trait last only a few minutes.
It is more stupid if you think electroshock through your brain can make you genious. :-)
***
A man who has a task to differentiate patterns shows an interesting Gamma Trait.
If a similar pattern (to the targeted pattern) is shown, there is also Gamma activity although not as high as from the targeted pattern.
For example there is pattern A, B, C, D. Pattern A has similarities with pattern B and C but it is totally different from pattern D. A subject should pay attention to pattern A. Gamma activity shows the highest response for A and shows a little response for B and C but no response for D.
***
In the talk, there was also different Gamma activity between healthy people and the ones with ADHD. It is too complicated to tell in this blog.
***
Next Monday, I will come to another talk: "A Bayesian model of Attentional Load".
Maybe the following talk will be useful for my Master Thesis.
I came to a colloquium in COGNIUM building of University of Bremen. The talk is presented by Prof. Dr. Christoph Herrmann, from the "Institut für Psychologie", University of Magdeburg. Actually, he has moved to the "Institut für Psychologie", University of Oldenburg.
The title of the talk is "Der Gamma-Trait: Inter-individuelle Variation der EEG Gamma-Band-Aktivität spiegelt Unterschiede kognitiver Funktionen wider". The title is in German but the talk is in English. So let me translate the title: "The Gamma-Trait: inter-individual variation of the EEG Gamma band activity reflects the differences in cognitive functions."
Gamma band is the EEG frequency above 30 Hz. Most experiments shown are about event-related potential (ERP) of the EEG. The events are created by stimuli: pictures showing pattern. The response is measured by EEG.
I didn't take note in the talk. I also came late.
But I remember a few things from the talk.
***
There are relationship between genes and the cognition.
The certain genes play a role in dopamine production and other neuronal activity.
The dopamine has relationship with Gamma band activity.
Gamma Band activity is generated by certain stimuli.
So the response of human brain or the cognition depends on genes.
It could means that the way we (human) think differently and act so because of our genes.
We were meant to be different from each other. So religious fundamentalism and racism, who hate different others, are really against our nature.
***
Prior knowledge is important.
There are two experiments showing pictures and recording EEG: first experiment is without prior knowledge and second experiment (in the following 2 weeks) is with prior knowledge from the first one. The second experiment always shows a higher Gamma trait.
***
Giving an electric current to your head increase your Gamma trait.
The experiment is done with both DC and AC voltage.
If you think you can get smarter after you have an electric current through your head, you are wrong. The effect of an increase of Gamma trait last only a few minutes.
It is more stupid if you think electroshock through your brain can make you genious. :-)
***
A man who has a task to differentiate patterns shows an interesting Gamma Trait.
If a similar pattern (to the targeted pattern) is shown, there is also Gamma activity although not as high as from the targeted pattern.
For example there is pattern A, B, C, D. Pattern A has similarities with pattern B and C but it is totally different from pattern D. A subject should pay attention to pattern A. Gamma activity shows the highest response for A and shows a little response for B and C but no response for D.
***
In the talk, there was also different Gamma activity between healthy people and the ones with ADHD. It is too complicated to tell in this blog.
***
Next Monday, I will come to another talk: "A Bayesian model of Attentional Load".
Maybe the following talk will be useful for my Master Thesis.
Brain-Computer Interface definition, Allison et al, 2008
"Brain-computer interface (BCI) systems are devices that allow people to communicate without moving. Instead, direct measures of brain activity are translated into messages or commands."
From the paper:
B. Allison, I. Volosyak, T. Lüth, D. Valbuena, I. Sugiarto, M.A. Spiegel, A. Teymourian, I.S. Condro, A. Brindusescu, K. Stenzel, H. Cecotti and A. Gräser. 2008. "BCI Demographics I: How many (and what kinds of) people can use an SSVEP BCI?". Proc. 4th International Brain-computer Interface Workshop and Training Course. Graz, Austria, September 18th-21st. pp 333-338.
They are all from Institute of Automation (IAT), University of Bremen, Bremen, Germany.
You can also visit B. Allison's blog or I.S. Condro's blog (yes, that's me).
Some of us have Facebook:
From the paper:
B. Allison, I. Volosyak, T. Lüth, D. Valbuena, I. Sugiarto, M.A. Spiegel, A. Teymourian, I.S. Condro, A. Brindusescu, K. Stenzel, H. Cecotti and A. Gräser. 2008. "BCI Demographics I: How many (and what kinds of) people can use an SSVEP BCI?". Proc. 4th International Brain-computer Interface Workshop and Training Course. Graz, Austria, September 18th-21st. pp 333-338.
They are all from Institute of Automation (IAT), University of Bremen, Bremen, Germany.
You can also visit B. Allison's blog or I.S. Condro's blog (yes, that's me).
Some of us have Facebook:
Monday, October 5, 2009
Tech Crunch Interviewed Bremen BCI in CeBit 2008
John Biggs from Tech Crunch made an interview with us, the BrainRobot research group from IAT Uni Bremen. Brendan Allison, as the leader of our group, explained many things about Bremen Brain-Computer Interface (BCI) in the CeBit 2008 event.
Here is a video about applications of Bremen SSVEP BCI for spelling and for moving robot.
You can see me for a couple of seconds. Yes, me with the long hair. I was too busy with preparing a subject to enter the Matrix. A subject wanted to participate in spelling experiment then.
Here is a video about applications of Bremen SSVEP BCI for spelling and for moving robot.
You can see me for a couple of seconds. Yes, me with the long hair. I was too busy with preparing a subject to enter the Matrix. A subject wanted to participate in spelling experiment then.
The Next Uri Geller in CeBit 2008
In CeBit 2008, in Hannover, the IAT from Uni Bremen were placed in some corner. It is quite a convenient place. People went around passing that corner. That is the reason we could get 106 subjects in a week.
This video shows how I tested the spelling program before doing experiment with random subjects. You will see the stimulator with 5 flickering boxes: Left, Right, Up, Down and Select. In the middle, there are letters which we can choose to build a word. The hardwares used are notebook, EEG amplifier called g.USBamp from Guger Technologies, EEG electrodes and EEG cap. The news can be seen in Science Blogs.
FYI, Uri Geller is a mentalist who like to bend spoons. He is famous in Germany.
And The Next Uri Geller is a TV show in Germany.
This video shows how I tested the spelling program before doing experiment with random subjects. You will see the stimulator with 5 flickering boxes: Left, Right, Up, Down and Select. In the middle, there are letters which we can choose to build a word. The hardwares used are notebook, EEG amplifier called g.USBamp from Guger Technologies, EEG electrodes and EEG cap. The news can be seen in Science Blogs.
Link: 
FYI, Uri Geller is a mentalist who like to bend spoons. He is famous in Germany.
And The Next Uri Geller is a TV show in Germany.
BrainRobot in CeBit 2008
In March 2008, BrainRobot research group of the IAT of the University of Bremen went to the CeBit in Hannover. We conducted a study of SSVEP-based BCI application there. We were doing experiments whether people can spell words using their brain wave: EEG. We got 106 subjects.
Below is the video about what happened in CeBit.
***
***
The result of the experiments can be seen in Allison, et al, 2008, "BCI Demographics: How many (and what kinds of) people can use an SSVEP BCI?", Proc 4th International Brain-computer Interface Workshop and Training Course, Graz, Austria, pp 333-338.
Below is the video about what happened in CeBit.
***
***
The result of the experiments can be seen in Allison, et al, 2008, "BCI Demographics: How many (and what kinds of) people can use an SSVEP BCI?", Proc 4th International Brain-computer Interface Workshop and Training Course, Graz, Austria, pp 333-338.
Saturday, October 3, 2009
The first neuron
Hello, world!
This is my blog about Brain and I just made the first writing to introduce my blog.
I am Ignatius Sapto Condro Atmawan Bisawarna. People call me "Condro". I participate in the brain research in Bremen since 2008 (or maybe end of 2007). I am a master student in the University of Bremen. There, we have an institute called IAT and a research group called BrainRobot.
End of 2007, I helped a friend putting EEG cap and gel on the head. My friend is Indar Sugiarto. He was doing his project about stimulator for SSVEP using monitor of a desktop PC and a laptop. I think it is the beginning of my participation in the Bremen brain research.
***
EEG is Electroencephalogram or Electroencephalography.
SSVEP is Steady-state visually evoked potential.
***
In March 2008, BrainRobot and I went to CeBit Hannover. In a week, we got more than 100 subjects participating in SSVEP-based BCI research. We have spelling application and the subjects should spell some words using their EEG.
***
BCI is Brain-Computer Interface.
***
In November 2008, I started my master project "Final Preparation of the CeBit Data". In 2009, I finished the project and started fixing thesis topic in this area. Now, I have made up my mind and the topic is "Improvement of Response Times of SSVEP-based Brain-Computer Interface". I will do some computing related to Time Series Analysis.
While doing thesis, I made these blog and hoping the AdSense can give me money.
This is my blog about Brain and I just made the first writing to introduce my blog.
I am Ignatius Sapto Condro Atmawan Bisawarna. People call me "Condro". I participate in the brain research in Bremen since 2008 (or maybe end of 2007). I am a master student in the University of Bremen. There, we have an institute called IAT and a research group called BrainRobot.
End of 2007, I helped a friend putting EEG cap and gel on the head. My friend is Indar Sugiarto. He was doing his project about stimulator for SSVEP using monitor of a desktop PC and a laptop. I think it is the beginning of my participation in the Bremen brain research.
***
EEG is Electroencephalogram or Electroencephalography.
SSVEP is Steady-state visually evoked potential.
***
In March 2008, BrainRobot and I went to CeBit Hannover. In a week, we got more than 100 subjects participating in SSVEP-based BCI research. We have spelling application and the subjects should spell some words using their EEG.
***
BCI is Brain-Computer Interface.
***
In November 2008, I started my master project "Final Preparation of the CeBit Data". In 2009, I finished the project and started fixing thesis topic in this area. Now, I have made up my mind and the topic is "Improvement of Response Times of SSVEP-based Brain-Computer Interface". I will do some computing related to Time Series Analysis.
While doing thesis, I made these blog and hoping the AdSense can give me money.
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