This function evaluates a hemodynamic response function (HRF) for a given set of time points (grid) and other parameters. It is used to generate the predicted BOLD (blood-oxygen-level-dependent) signal changes in fMRI data analysis.
Usage
# S3 method for HRF
evaluate(
x,
grid,
amplitude = 1,
duration = 0,
precision = 0.2,
summate = TRUE,
normalize = FALSE,
...
)Arguments
- x
The HRF function.
- grid
A vector of time points.
- amplitude
The scaling value for the event (default: 1).
- duration
The duration of the event (default: 0).
- precision
The temporal resolution used for computing summed responses when duration > 0 (default: 0.2).
- summate
Whether the HRF response increases its amplitude as a function of stimulus duration (default: TRUE).
- normalize
Scale output so that peak is 1 (default: FALSE).