Mapping colour-selective columns in V2 across cortical depth using GE-and SE-EPI
Daniel Haenelt, Robert Trampel, Shahin Nasr, Jon̈athan R. Polimeni, Roger B. H. Tootell, Martin I. Sereno, Nikolaus Weiskopf · MPG.PuRe (Max Planck Society) · 2018
NeuroCom• At ultra-high magnetic fields ( ≥ 7 T), fMRI enables the delineation of mesoscale human functional structures.• Recently, selective stripes were visualised in human visual areas V2-V3 based on colour and disparity selectivity [1] and differences in temporal frequency sensitivity [2], respectively.• Although the spatial extent of those stripe-like structures may depend on cortical depth to some degree, they approximately follow a columnar arrangement penetrating uniformly the cortex [3].• However, when using a gradient-echo (GE) echo-planar imaging (EPI) sequence, the activation pattern may suffer from the well-known bias due to draining veins, especially close to the pial surface [4].