Coordinates of the activated region, if form=="cube" or form=="sphere", the coordinates represent the center of the region, if form=="manual", the coordinates should be in matrix form, where the rows represent the voxels and the columns the x-y-z coordinates.
radius
If form=="cube" or form=="sphere", the distance in voxels from the center of the region to the edge.
form
The form of the activated region. Default is "cube".
fading
Decay rate between 0 and 1. 0 means no fading, while 1 results in the fastest decay.
Value
An array representing the activation image with specified regions.
Author(s)
M. Welvaert
See Also
specifyregion,gammaHRF,canonicalHRF,balloon
Examples
d <- c(10,10,10)
coord <- c(3,3,3)
radius <- 1
out <- specifyregion(d, coord, radius, form="sphere")