lab2_addendum

lab2_addendum - UCSB Fall 2010 ECE 594C: Addendum to Lab 2...

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Unformatted text preview: UCSB Fall 2010 ECE 594C: Addendum to Lab 2 (Hypothesis Testing for fMRI?) Assigned: November 4, 2010 Due: Date to be negotiated based on other course to-dos. We have seen in class how noisy fMRI data is. Yet we are able to recognize the active voxels quite well, at least for Bens data, using a variety of methods. It would be nice to get some insight into this. To this end, I am proposing a hypothesis testing model as follows. Suppose that we wish to decide whether a group of voxels is active or not. As in class on November 3, consider the time instants at and immediately following a stimulus as the observed waveform (e.g., consider 5 samples, including the TR at which the stimulus is applied). Collecting these readings over both stimuli and voxels, we have a collection of waveforms { y i ( t ) ,i = 1 ,...,N } , where N is the product of the number of stimuli and the number of voxels (about 80 27 = 2160 in our case). As in class, assume that the time course for each voxel has already been de-meaned. Let us now consider the following simple-minded hypothesis testing model....
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lab2_addendum - UCSB Fall 2010 ECE 594C: Addendum to Lab 2...

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