Monthly Archives: August 2010

Significance

As a scientist, significance is very important. Is using P300 more pleasant than using SSVEP? Does this analysis pipeline yield a higher detection accuracy than the other? Is for this mental task the brain activity different from general baseline activity?

Generally, we compute the chance p that the second set of samples is from the same population as the first. If p is small, we reject this hypothesis (Of course there is still a chance of p that we are wrong in this). As a convention, if p is smaller than 0.05 we say the difference is statistically significant. If p is smaller than 0.10, you can speak of a trend, which generally means that you should try to do more tests. Because with more samples it is easier to get a significant difference.

There is a nice article on measuringusability.com about this convention of needing a p < 0.05 for significance, which argues not to blindly follow this convention, but look at what your results really mean. Continue reading

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eNTERFACE 2010

Every year there is an event called eNTERFACE. It is announced as a summer workshop, but it is a bit more. About teams work on different multimodal human-computer interaction projects for 4 weeks, and there are some tutorials and lectures. You can submit a project proposal yourself if you like, or you can join the team for the project of somebody else.

Last year Christian Muehl from our group was team leader for a project which resulted in the game Bacteria Hunt, in which you play an amoeba controlled by keyboard, SSVEP, and alpha activity. The goal is to eat as many bacteria as you can.

I loved the whole idea and atmosphere of eNTERFACE then, so this year I could not help but propose a project of my own. We got a nice team together, and implemented Wild Photoshoot. Continue reading