construct an native AFNI hrf specification for '3dDeconvolve' with the 'stim_times' argument.

Usage

afni_hrf(
  ...,
  basis = c("spmg1", "block", "dmblock", "tent", "csplin", "poly", "sin", "sine", "gam",
    "gamma", "spmg2", "spmg3", "wav"),
  onsets = NULL,
  durations = NULL,
  prefix = NULL,
  subset = NULL,
  nbasis = 1,
  contrasts = NULL,
  id = NULL,
  lag = 0,
  precision = 0.3,
  summate = TRUE,
  start = NULL,
  stop = NULL
)

Arguments

...: Variables to include in the HRF specification
basis: Character string specifying the basis function type
onsets: Numeric vector of event onset times
durations: Numeric vector of event durations
prefix: Character string prefix for the term
subset: Expression for subsetting events
nbasis: Number of basis functions
contrasts: Contrast specifications
id: Character string identifier for the term
lag: Numeric lag in seconds
precision: Numeric precision for convolution
summate: Logical whether to summate overlapping responses
start: the start of the window for sin/poly/csplin models
stop: the stop time for sin/poly/csplin models

Value

an afni_hrfspec instance with class "afni_hrfspec"

Examples

# Create SPM canonical HRF specification
hrf1 <- afni_hrf(onsets = c(10, 30, 50), basis = "spmg1")

# Create block HRF with duration
hrf2 <- afni_hrf(onsets = c(10, 30, 50), durations = 5, basis = "block")

# Create tent basis HRF
hrf3 <- afni_hrf(onsets = c(10, 30, 50), basis = "tent", 
                 start = 0, stop = 20, nbasis = 10)