Cluster-Size Thresholding in BrainVoyager

The paper "Cluster failure: Why fMRI inferences for spatial extent have inflated false-positive rates" by Eklund and colleagues received a lot of attention this summer pointing out that fMRI software packages do not correctly perform multiple comparisons correction of statistical maps when using cluster-extent based thresholding…

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BrainVoyager 20 - A Milestone Release

I am happy to present to you BrainVoyager 20, which is an important milestone introducing powerful new tools and interface elements that make it even easier to analyze and visualize neuroimaging data sets in a comprehensive, easy to use software package. With a new data analysis manager and a new Python interface (see below), BrainVoyager 20 (BV 20) sets the stage for future releases that will build on and extent the current implementation. BV 20 also introduces a new software-based licensing model that provides more flexible, subscription based software activation. The importance of this release is indicated already…

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Brain Tutor HD 2.1 for iPad, iPhone and iPod Touch

Brain Tutor HD 1.0 has become quite popular as indicated by top-10 rankings in the "Education" category in several App Stores around the world during the last year. While some users asked for more features, there were no bug reports and I was, thus, not forced to submit maintenance releases. A few months ago I have started on other iOS apps (more on this in a future blog post) that used some new features of the iOS 5 API (see below). When this work was done, I decided to rewrite large parts of Brain Tutor HD so that it would…

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Automatic AC-PC and Talairach Transformation

While it is relatively easy to specify reference planes and landmark points for AC-PC and Talairach transformation, the interactive, manual procedure is subject to individual interpretations of the position/orientation of reference points/planes that can lead to specifications on slices that deviate a few millimeters when performed by different researchers. Even if the same researcher performs these definitions repeatedly on the same brain, small deviations are typically observed. Most importantly, the definition of landmarks such as the anterior and posterior commissure...

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Brain Tutor HD on iPad - It's a Kind of Magic

When Steve Jobs introduced the iPad to the world, he called it a "magic" device. And indeed, playing, learning and working with it feels very intuitive. Especially its relatively large screen evokes the feeling that one works with a serious mobile computing platform and the multi-touch interface is even more impressive than on a 3-4 inch gesture-driven smartphone screen. When I decided to develop a version of Brain Tutor for the iPad, I immediately realized that it had to exploit the larger screen for more efficient navigation and for better visualizations of brain slices...

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