Trains and EEG

I had this blog post as a draft for nearly a year now… and finally here it is: In my last lab we moved buildings. Good scientists we are we did measurements to see if the system works as intended… The EEG Systems An active 64 electrode system from BrainProducts called ActiCap A passive 128 electrode system from ANT, a tmsi REFA-8 with actively shielded cables A passive 128 electrode system from ANT, eegosport with actively shielded cables Disclaimer: All data shown here are from different subjects. Their individual alpha-peaks etc. will differ, we also switched methods a bit ActiCap…

Thesis Art: Lisa-Marie Vortmann

I was a supervisor for Lisa-Marie Vortmanns’s Master’s Thesis. In her project, we tried to decode from brain activity* which objects on a screen a subject is currently tracking with their mind. To do this, we “tagged” the to-be-tracked objects and distractor with different frequencies, so that we can trace them in the EEG. What you see here is the SSVEP response over time for three trials per row. At the beginning and end, the response is small because the object was not tracked, only in the middle part one can see that the response is much larger, the object…

Tuning your plots

I showed a student how I would improve a plot. The result is I think typical for what I would design. The details change for each paper and I do not have a specific “style” I wanted to emulate. I usually enjoy the before & after of other graphics, so here is mine: PS: The data shown in the plots are preliminary

Thesis Art: Maria Sokotushchenko

I was a supervisor for Maria Sokotushchenko’s Master’s Thesis. In her thesis-art, I artistically visualized the brain’s surprise response to a unexpected stimulus change. This response is sorted by how fast subjects responded (late on top, fast in the bottom)   The idea of “thesis art” is to inspire discussion with persons who do not have an academic background or work in a different field. The thesis is hidden in the drawer, but the poster is out there at the wall for everyone to see. You can find all past thesis art pieces here

Thesis Art: Edoardo Pinzuti

I was a co-supervisor for Edoardo Pinzuti’s Master’s Thesis. I finally came around to make this artwork with the text from his thesis. He wrote an impressive matlab toolbox to analyze causality directions in time series based on Takens Theorem. The whole idea is about reconstructing embeddings of chaotic systems, with the Lorenz system (the one depicted in this artwork) being a simulation example in his thesis. Please find the DDIFTOOL toolbox here The idea of “thesis art” is to inspire discussion with persons who do not have an academic background or work in a different field. The thesis is…

Thesis Art: Judith Schepers

I was a supervisor for Judith Scheper’s Bachelor’s Thesis. In this thesis-art, I visualized the guided-bubble paradigm used in a recent publication in the Journal of Vision. Judith generalized the paradigm to more than five bubbles, therefore, many more bubbles are visible in the thesis-art. The idea of “thesis art” is to inspire discussion with persons who do not have an academic background or work in a different field. The thesis is hidden in the drawer, but the poster is out there at the wall for everyone to see. You can find all past thesis art pieces here

New Paper: The temporal dynamics of eye movements as an exploitation-exploration dilemma.

We just published a new paper in the Journal of Vision The temporal dynamics of eye movements as an exploitation-exploration dilemma Ehinger Kaufhold & König, 2018 The highlights: We put eye movements as a decision process between exploitating the current view and exploring more of the scene We use gaze-contingent eye-tracking to control the When and Where of eye movements We find large effects of how long a subject fixates on their reaction time to continue exploring We find large effects of the number of possible future target locations (Hick’s effect) Check out the paper at the Journal of Vision…

Ubuntu 16+: Recover ctrl+alt+bksp to restart X server

Often when developing with psychotoolbox or psychopy/opensesame your program crashes. And I often then have a full-screen window open and cannot click somewhere else. I then try to Alt+Tab and execute “sca” (screen close all) into the matlab console, with often mixed success. Sometimes restarting the computer is the last option. Instead of restarting, a useful command in older ubuntu versions was: STRG + ALT + Backspace => restart X server (=> restart GUI). In order to activate this again use: setxkbmap -option terminate:ctrl_alt_bksp source on askubuntu     PS: I wrote this blogpost because I looked up this thing…

Stretching the axes; visualizing non-linear linear regression

  From time to time I explain concepts and ideas to my students. Background Often this pops up in a statistical context, when one has a non-linear dependency between the to-be-predicted variable and the predictor-variables. By transforming the predictors, relationships can be made linear, i.e. a logarithmic (exponential, quadratic etc.) relationships can be modeled by a **linear** model. The idea I have a very visual understanding on basis-functions / non-linear transformation of variables in terms of stretching / condensing the basis (the x-axis here). This can also be applied to the generalized linear model (here for logistic regression). Imagine that…

Working remote – X11 Forward, Putty, Windows, Gateway

Sometimes I need matlab/rstudio/spyder but with access to the university network. One way is to run matlab/rstudio/spyder on the university computers, but get the X (=Graphics) display on my local windows machine. Because there is a gateway in between, I first need to tunnel the gateway to a university working computer, then use a second putty session to ssh right through the tunnel directly to the target computer. These are the steps I need to do: – Putty: ssh to gateway.university:22;  Go to SSH-Tunnel and put source-port: 2222 (this is your local port you gonna target the second session). destination:…

4 of 7
1234567