Figure 6.

Simulations of activations similar to those from phase-encoded mapping of eccentricity. The stimulus is two 1.4-cm-tall rectangles moving upward in the field of view. There are a total of 18 activations in the entire rotation series. (a) to (c) Three equally spaced frames from the sequence of targets. (d) to (f) These three activations are reconstructed with the square sparse array. The activations are displaced to the nearest measurement location, often resulting in squeezing in the horizontal direction. (h) to (j) Reconstructions using the triangular sparse array. Activations under the source planes are unconstrained vertically due to the pad’s symmetry. (k) to (m) Reconstructions using the high-density array. Activations are correctly placed with the correct size. (n) Legend defining the phase of the target phase-encoded stimulus. (o) The phase of each pixel’s activation at the rotation frequency using the square sparse array. The square sparse array is able to find the general trend of increasing phase vertically, but with many artifacts in shape. (p) Phase-encoded mapping using the triangular sparse array. Due to the inability to vertically localize activations, the array can only define two general regions of phase, and it converts gradients that should be vertical to be horizontal. (q) Phase mapping with the high-density array, which correctly locates all phases in the target.