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'''HRF'''Haemodynamic Response Function, describes the delayed, blurred haemodynamic response that occurs in response to a stimulus<<BR>>  '''HRF'''Haemodynamic Response Function, describes the delayed, blurred haemodynamic response that occurs in response to a stimulus 
Glossary of Acronyms and Abbreviations
AVW 
Analyze file format 
BET 
Brain Extraction Tool  segments brain from nonbrain in structural and functional data 
COPE 
Contrast of Parameter Estimates 
DOF 
Degrees Of Freedom, the number of independent pieces of information that go into the estimate of a parameter 
EV 
Explanatory Variable, an effect (e.g. type of stimulation, confound) that is included in a general linear model 
FAST 
FMRIB's Automated Segmentation Tool  brain segmentation (into different tissue types) and bias field correction 
FE 
Fixed Effects. FE variance is the withinsession acrosstime variances estimated in firstlevel analyses 
FEAT 
FMRI Expert Analysis Tool  for preprocessing and statistical analysis of FMRI data 
FILM 
FMRIB's Improved Linear Model  for GLMbased analysis of first level (time series) data with prewhitening 
FIR 
Finite Impulse Response, a discrete, fixed duration resonse to an impulse 
FLAME 
FMRIB's Local Analysis of Mixed Effects  for higher level analyses of multiple subjects/sessions 
FLIRT 
FMRIB's Linear Image Registration Tool  linear inter and intramodal registration 
FMRIB 
Oxford Centre for Functional Magnetic Resonance Imaging of the Brain 
FSL 
FMRIB Software Library  a collection of functional and structural brain image analysis tools 
FUGUE 
FMRIB's Utility for Geometrically Unwarping EPIs  Unwarps geometric distortion in EPI images using B0 field maps 
FWHM 
Full Width between Half Maximum values of a function 
GLM 
General Linear Model (more properly referred to as just "linear model") 
GRF 
Gaussian Random Field. GRF theory is used in various thresholding techniques 
GUI 
Graphical User Interface  lets users interact with tools using a "point and click" approach rather than typing text into a command line. 
HRF 
Haemodynamic Response Function, describes the delayed, blurred haemodynamic response that occurs in response to a stimulus 
ICA 
Independent Component Analysis 
MCFLIRT 
Motion Correction using FMRIB's Linear Image Registration Tool 
MCMC 
Markov Chain Monte Carlo, a sampling technique 
ME 
Mixed Effects. ME variance is the sum of "fixedeffects" variance and "randomeffects" variance 
MELODIC 
Multivariate Exploratory Linear Optimized Decomposition into Independent Components  PICAbased modelfree analysis of FMRI data 
MNI 
Montreal Neurological Institute. The MNI152 template is a standardspace average of 152 brains 
OLS 
Ordinary Least Squares, a technique for calculating the parameters in a regression equation that minimizes the sum of the squares of the error terms 
PE 
Parameter Estimate, an estimate of how strongly an EV fits the data at each voxel 
PICA 
Probabilistic Independent Component Analysis 
RE 
Random Effects. RE variance is the "true" crosssession variances of firstlevel parameter estimates 
SIENA 
Structural brain change analysis  for estimating brain atrophy (stands for: Structural Image Evaluation, using Normalisation, of Atrophy) 
SUSAN 
nonlinear noise reduction (stands for: Smallest Univalue Segment Assimilating Nucleus) 
TBSS 
TractBased Spatial Statistics  a method for carrying out voxelwise comparisons of diffusion data across subjects 
TR 
Repetition Time  time between scanning succesive brain volumes 