This function generates a spherical searchlight iterator by sampling regions from within a brain mask. It creates searchlight spheres around random center voxels, allowing the same surrounding voxel to belong to multiple searchlight samples.
Arguments
- mask
A
NeuroVolobject representing the brain mask.- radius
A numeric value specifying the radius of the searchlight sphere in voxel units. Default is 8.
- iter
An integer specifying the total number of searchlights to sample. Default is 100.
Value
A deferred_list object containing ROIVolWindow
objects, each representing a spherical searchlight region sampled from within the mask.
Details
Searchlight centers are sampled without replacement, but the same surrounding voxel can belong to multiple searchlight samples.
Examples
# Load an example brain mask
mask <- read_vol(system.file("extdata", "global_mask_v4.nii", package="neuroim2"))
# Generate a bootstrap searchlight iterator with a radius of 6 voxels
if (FALSE) { # \dontrun{
searchlights <- bootstrap_searchlight(mask, radius = 6)
} # }