Posts by: behinger

Sun Grid Engine Command-Dump

Here in the institute we have a Sun Grid Engine available. It is a tool to post computing-jobs on other workspaces (we have I think up to 60 available). There are certain commands and things that I do regularly which I tend to forget after half a year, or which might be useful for orthes. Show all jobs that are running on the grid qstat -u \* or alternativly for a single user qstat -u behinger exclude a single computer/host from running a job qsub -l mem=5G,h=!computername.domain script.sh to exclude multiple hosts: h=!h4&!h5 or h=!(h4|h5) Source of course mem=5G is…

Matlab winsorized mean over all dimension

This is a function I wrote back in 2014. I think it illustrates an advanced functionality in matlab that I hadn’t found written about before. The problem: Calculate the winsorized mean of a multidimensional matrix over an arbitrary dimension. Winsorized Mean The benefits of the winsorized mean can be seen here: We replace the top 10% and bottom 10% by the remaining most extreme value before calculating the mean (left panel). The right panel shows how the mean is influenced by a single outlier, but the winsorized mean is not (ignore the “yuen”-box”) Current Implementation I adapted an implementation from…

An interactive ICA tutorial

Some years ago, I wrote an interactive tutorial for ICA using D3.js and some java-script but never published it. Now I let it fly. I got inspired by this page from Arnould Delorme. Click the Image or the link here I also gave a presentation about ICA using the tool which you can find here If you find mistakes or problems please drop me an email.

Bayesian Modelling of Melanopsin

In this project we work with Melanopsin, a photoactive opsin that can be used for optogenetical experiments. This is collaborative work with the Herlitze Lab from the Ruhr-Universität Bochum. A first paper got recently accepted in Current Biology which characterizes two different melopsin subtypes. The first version of our modeling work has recently been published on bioRxiv (preprint). The manuscript is work in progress, I’m very interested in discussing our approach and the manuscript. Benedikt V. Ehinger¹, Dennis Eickelbeck², Katharina Spoida², Stefan Herlitze², Peter König¹³

Predictive Coding in the Blind Spot

We investigate the blind spot in an online gaze-dependent eyetracking / EEG paradigm. We recently published our findings in the Journal of Neuroscience. We also gave a talk at the Vision Science Society. We had posters at the Statistical Challenges Conference in Warwick, the Donders-Discussions in Nijmegen and the Brain-Conference in Kopenhagen in May. We further had great Posters at the ECEM in Vienna and the MMN conference in Leipzig. I love to discuss our work on the blind spot and the resulting prediction errors and implications for predictive coding with you! Benedikt V. Ehinger¹, Peter König¹², Josè Ossandon¹  

Walk the Line

This project was winner of the one week student project competition at the BCBT 2012 summer school.   Introduction: Not many studies exist, that measure deviation of subjects while walking an ideal line while beeing blindfolded. This study tries to gather data and get an estimate, how big the deviation at the end of a 3m walk is. We also try to modulate our subjects performance with adding online auditory feedback. We hypothesize that performance with visual feedback is near perfect, blind performance has a significant deviation, while auditory feedback helps the subject

Visual Category Learning

We observe learning of novel classes of perceptual stimuli in an M/EEG study over more than 20 sessions. Introduction Everyday we use categories to interpret and act on our environment. Of course, this is necessary as we have to discriminate for example edible from poisonous food or friend from foe. Such representations are involuntarily and immediately accessible to our consciousness. How do new categories emerge in our brain? One way to study human category behaviour is to train humans to learn new classes by presenting different stimuli with some kind of feedback and analyse their behaviour. In addition to observing…

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