(a) average of fMRI time series.
(b) sample SD of on/off block difference images.
(c) sample average of on/off block differences.
(d) wavlet coefficients of (c) for 4-level transform.
(e) significant (alpha = 0.05) wavelet coefficients.
(f) inverse wavlet transform of (e) yields estimate of activation signal.
This illustration is from NIAAA's Laboratory of Clinical Studies, Section of Brain Electrophysiology and Imaging
Updated: August 2002