The glossary provides definitions of terms specific for NeuroAnalyzer.
channel: single vector of values, usually recorded over
time. Channel has a label (e.g. “Fp1”), its type (e.g. “eeg” or “eog”),
a unit (e.g. “μV”). Available NeuroAnalyzer channel types are stored in
component: is data produced by processing or analyzing
neurophysiological data, e.g. primary components. They can be stored
together with the parent data within the NEURO object and accessed for
data: is a vector (e.g. single channel over time), a
matrix (e.g. channels × channels) or an array (channels × time × epoch)
epoch: segment of recorded data; epochs may be defined
using markers (e.g. stimuli / events) or time intervals. Every recording
data imported to NeuroAnalyzer has at least one epoch.
label: name attributed to a channel, e.g. “Fp1” for EEG
or “S1_D1 OD” for NIRS.
locs: positions of electrodes / detectors used to record
neurophysiological data (e.g. EEG electrodes or NIRS optodes). Positions
are defined in 2D and 3D space separately using Cartesian (X, Y, Z),
planar (radius and theta) and spherical (radius, theta and phi)
coordinates. NeuroAnalyzer uses RAS (Right-Anterior-Superior)
R: +X is right, -X is left,
A: +Y is anterior (front), -Y is posterior (rear),
S: +Z is superior (top), -Z is inferior (bottom).
marker: event that has been recorded simultaneously with
neurophysiological data, e.g. push of a button. Each marker has an id
S01), onset (in samples), duration (in samples) and
mutator: function that modifies the input object instead
of returning it. Mutator functions are depicted using
character in their names, e.g.
NEURO object: the fundamental object of
neurophysiological data on which NeuroAnalyzer operates. Each object
contains a header (with recording, subject and experiment meta-data),
time points, epoch time points, recording data, channel locations, event
markers and processing history. A new object is created by importing a
neurophysiological recording, e.g. EEG or MEG.
pick: defines a set of channel locations, e.g. [:left,
:frontal] pick would be [“Fp1”, “F3”, “F7”] channels.
signal channel: channels that contain neurophysiological
recorded data, e.g. for EEG these would be “Fp1” or “C3” labeled
channels, but not “EOG” or “A1” channels. For MEG data these would be
magnetometers (“meg”) and gradiometers (“grad”) type channels.