specifyregion: Generate activation image

In neuRosim: Simulate fMRI Data

Generate activation image

Description

Generates an image with activated regions for specified dimensions. The regions are defined by their center and radius or can be entered manually.

Usage

  specifyregion(dim, coord, radius = NULL, 
	form = c("cube", "sphere", "manual"), 
	fading = 0)

Arguments

dim	Dimensions of the image space.
coord	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")

neuRosim documentation built on Oct. 18, 2023, 5:09 p.m.