HRF_main

Calculate the HRF from a time vector and parameters. Optionally compute the
first or second derivative of the HRF instead. Form of HRF is similar to SPM
but here the response and undershoot are scaled so the difference of the HRFs
peaks at 1 and -c

Computes the hemodynamic response function (HRF) for task
functional magnetic resonance imaging (fMRI) data. Also includes functions
for constructing a design matrix from task fMRI event timings, and for
comparing multiple design matrices in a general linear model (GLM). A
wrapper function is provided for GLM analysis of CIFTI-format data. Lastly,
there are supporting functions which provide visual summaries of the
HRFs and design matrices.

Amanda Mejia

Hemodynamic Response Function

Damon Pham

David Bolin

Yu (Ryan) Yue

Daniel Spencer

Sarah Ryan

HRF_main function

<dl><dt>t</dt>
<dd>time vector (in seconds). Must be equally spaced.</dd>
<dt>a1</dt>
<dd>delay of response. Default: <code>6</code></dd>
<dt>b1</dt>
<dd>response dispersion. Default: <code>1</code></dd>
<dt>a2</dt>
<dd>delay of undershoot. Default: <code>16/6*a1 = 16</code></dd>
<dt>b2</dt>
<dd>dispersion of undershoot. Default: <code>b1 = 1</code></dd>
<dt>c</dt>
<dd>scale of undershoot. Default: <code>1/6</code></dd>
<dt>o</dt>
<dd>onset of response (in seconds). Default: <code>0</code></dd></dl>

Arguments

Canonical (double-gamma) HRF — HRF_main

<dl>

<dt>t</dt>
<dd>time vector (in seconds). Must be equally spaced.</dd>


<dt>a1</dt>
<dd>delay of response. Default: <code>6</code></dd>


<dt>b1</dt>
<dd>response dispersion. Default: <code>1</code></dd>


<dt>a2</dt>
<dd>delay of undershoot. Default: <code>16/6*a1 = 16</code></dd>


<dt>b2</dt>
<dd>dispersion of undershoot. Default: <code>b1 = 1</code></dd>


<dt>c</dt>
<dd>scale of undershoot. Default: <code>1/6</code></dd>


<dt>o</dt>
<dd>onset of response (in seconds). Default: <code>0</code></dd>

</dl>

HRF_main: Canonical (double-gamma) HRF

Description

Usage

Value

Arguments

Examples