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<h1>Multivariate analysis of BOLD activation patterns recovers graded depth representations in human visual and parietal cortex</h1> <p>We presented subjects with stereoscopic sphere stimuli, composed of multicolored flickering dots. Stimuli were presented at various positions evenly spaced along the horizontal (left-right) spatial axis, and the depth (near-far) spatial axis. We used an inverted encoding model to reconstruct the locations of stimuli along each of these spatial axes.</p> <p>For analysis code, see our Github repository at: <a href="https://github.com/mmhenderson/IEMdepth" rel="nofollow">https://github.com/mmhenderson/IEMdepth</a></p> <h4>Contents:</h4> <p>Each file in IEMdepth_trialData contains all data for a single subject. </p> <p>The variable "trialDataAll" is a structure array containing data for 12 ROIs. The names of the ROIs are given in "VOIs". </p> <p>For each element in trialDataAll, the fields are as follows:</p> <ul> <li>aAll [nTrials x nVoxels]: the average signal in each TR on each trial, obtained by averaging the 3rd and 4th TRs following stimulus onset. This was used for all analyses reported in our paper.</li> <li>bAll [nTrials x nVoxels]: beta weight for each voxel on each trial, obtained with a GLM. These values were not used for any of our main analyses.</li> <li>stimLocsAll [nTrials x 3]: the exact [x,y,z] coordinates of the sphere stimulus presented on each trial, in OpenGL coordinates. Note that the second column, Y position, is always 0. </li> <li>condAll [nTrials x 1]: the task condition corresponding to each trial, where 1 is attend fixation and 2 is attend target. We did not analyze the attend target data in our paper. </li> <li>runsAll [nTrials x 1]: the run labels for each trial. There are 36 trials per run, with runs always occuring in task pairs - e.g. run 1 of the fixation task, followed by run 1 of the target task.</li> <li>spinDir [nTrials x 1]: the direction of rotation of a brief pulse of motion by the sphere stimulus, which occured on every trial (this was relevant only on attend target trials). </li> <li>fixChgDir [nTrials x 1]: the change in contrast of the fixation point, which occured on every trial (this was relevant during attend fixation trials). </li> <li>resp [nTrials x 1]: the subject's response button on each trial. A correct response should match the value in spinDir during attend target runs and should match the value in fixChgDir during attend fixation runs.</li> </ul>
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