HRF96: Canonical (double-gamma) HRF (old one from SPM96, Glover)

In hrf: Hemodynamic Response Function

Canonical (double-gamma) HRF (old one from SPM96, Glover)

Description

Calculate the HRF from a time vector and parameters. Optionally compute the first or second derivative of the HRF instead.

Usage

HRF96(t, deriv = 0, a1 = 6, b1 = 0.9, a2 = 12, b2 = 0.9, c = 0.35)

Arguments

t	time vector
deriv	0 (default) for the HRF, 1 for the first derivative of the HRF, or 2 for the second derivative of the HRF.
a1	delay of response. Default: 6
b1	response dispersion. Default: 0.9
a2	delay of undershoot. Default: 12
b2	dispersion of undershoot. Default: 0.9
c	scale of undershoot. Default: 0.35

Value

HRF vector (or dHRF, or d2HRF) corresponding to time

Examples

upsample <- 100
HRF96(seq(0, 30, by=1/upsample))

hrf documentation built on April 3, 2025, 10:36 p.m.