(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