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;REF1
;
; UNSMOOTHED GLOBAL SIGNAL COVARIATE INCLUDED
;
; These three parameters define the shape of a 1/f noise curve. They were
; derived from the square root of the grand average power spectrum from 13
; subjects scanned under the null-hypothesis. This curve can be used
; as a model of the intrinsic autocorrelation present in BOLD fMRI data
; collected under the null-hypothesis. Typically, this representation is
; placed within the K matrix of the GLM of Worsley and Friston (1995).
;
; For these values, the data were NOT smoothed but did have the effect of the
; global signal removed.
;
; The values (k1, k2, k3) correspond to steepness, y-offset, and x-offset,
; respectively. The equation that these parameters are used within is:
;
; 1
; a(w) = ---------------- + k2
; k1*( w + k3 )
;
; For more details, see:
;
; Zarahn, E., Aguirre, G.K., DUEsposito, M. (1997) Empirical
; analyses of BOLD fMRI statistics. I. Spatially unsmoothed
; data collected under null-hypothesis conditions.
; Neuroimage 5: 179-197.
;
; and
;
; Aguirre G.K., Zarahn, E., D'Esposito, M. (1997) Empirical
; analyses of BOLD fMRI statistics. II. Spatially smoothed
; data collected under null-hypothesis and experimental conditions.
; Neuroimage 5: 199-212.
;
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