Fiber orientation

Purpose

Use Fiber orientation to analyze the direction of fiber vectors. Fiber orientation vectors are modeled with arrows overlaid on the tracing data.

Select FIber orientation from the orientation drop-down menu on the Analyze ribbon. Neurolucida Explorer opens the Fiber orientation analysis window.

Analysis results

Arrow location: The (X, Y, Z) location of the point of the arrow in relation to the reference point of the data file.

Orientation scale: The width of fibers for which you want orientation information. The orientation scale is specified when orientation is detected in Neurolucida 360.

Orientation score: Measure of confidence in the direction of the vector detected at that location. The higher the value, the more likely it is that the fiber at that position is oriented in the principal direction of the vector.

Orientation direction: The direction along the fiber.

Orientation sheet: The direction across the width of the fiber.

Orientation normal: The direction orthogonal to the Orientation direction and Orientation sheet. In other words, if Orientation direction is the X axis, and Orientation sheet is the Y axis, then Orientation normal is the Z axis.

Hessian elements: The matrix from which Orientation direction, Orientation sheet, and Orientation normal are derived and calculated.