sim.fmri2COVAR {adaptsmoFMRI}

R Documentation

Simulate FMRI Data

Description

This function returns the synthetic spatiotemporal data set resembling functional MR Images (fMRI) data.

Usage

  sim.fmri2COVAR(hrf, beta.Var1, beta.Var2)

Arguments

hrf	haemodynamic response function, needs to be a vector of length T.
beta.Var1	scalar, defines the height of the activated area, in form of a cylinder of the first grid.
beta.Var2	scalar, defines the height of the activated area, in form of a cylinder of the second grid.

Details

The returned data is simulated on a 20 x 20 grid.

Value

fmri	matrix, simulated fmri data.

Note

This function is solely for two covariates.

Author(s)

Maximilian Hughes

Examples

# non-transformed hr-function
T <- 180
seq.length <- T*3
index <- seq(3, T*3, by = 3)
vis <- rep(c(-0.5, 0.5), each=30, times=ceiling(T/30*1.5))
vis <- as.matrix(vis[index])
aud <- rep(c(-0.5, 0.5), each=45, times=ceiling(T/30*1.5))
aud <- as.matrix(aud[index])
hrf <- cbind(vis,aud)
# define height of activation area
beta.Var1 <- beta.Var2 <- 3
# use function to obtain fmri data
data <- sim.fmri2COVAR(hrf, beta.Var1, beta.Var2)$fmri

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