A sampling_frame describes the block structure and temporal sampling of an fMRI paradigm.
Arguments
- blocklens
A numeric vector representing the number of scans in each block.
- TR
A numeric value or vector representing the repetition time in seconds (i.e., the spacing between consecutive image acquisitions).
- start_time
A numeric value or vector representing the offset of the first scan of each block (default is
TR/2).- precision
A numeric value representing the discrete sampling interval used for convolution with the hemodynamic response function (default is 0.1).
Value
A list with class "sampling_frame" describing the block structure and temporal sampling of an fMRI paradigm.
Examples
frame <- sampling_frame(blocklens = c(100, 100, 100), TR = 2, precision = 0.5)
# The relative time (with respect to the last block) in seconds of each sample/acquisition
sam <- samples(frame)
# The global time (with respect to the first block) of each sample/acquisition
gsam <- samples(frame, global = TRUE)