**LORETA 3-Dimensional Source
Correlations
**

** NeuroGuide computes the Pearson Product Correlation
Coefficient (-1 to +1) with respect to a 3-dimensional Region of Interest (ROI)
and the remainder of the 2,394 LORETA Gray Matter Pixels and then displays the
results in the LORETA Viewer (see NeuroGuide Manual
Appendix-G). The ROI is identified by either an Anatomical Name or by Brodmann Area. The average current sources
of the ROI are used in the computation of the correlation coefficient and the
ROI correlation with itself = 0 in the LORETA Viewer.
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**Brodmann**** assigned numbers to various
cortical regions by analyzing each area's cellular structure starting from the
central sulcus (Area No. 1). Different cell
structures resulted in different Brodmann area
numbers. Below are illustrations of the Brodmann areas for the lateral sagital surface of the cortex as well as the medial surface.
Use the illustrations below to aid in deciding which Brodman areas and/or anatomical locations to be selected in NeuroGuide.
**

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** After
the LORETA Viewer Launches Click ScaleWin and Adjust
the Change Max Wiper to the correlation value that is statistically significant
based on the Degrees of Freedom (i.e., number of 2 second epochs or the edit
time in seconds divided by 2). Then click Time Frame arrows to advance
from 1 to 30 Hz and view the correlations between, e.g., the Right Inferior
Temporal Gyrus and the remainder of the 2,394
pixels.
**