AND node

An AND node is a node in compact notation. It is represented by an isosceles triangle about half as tall as it is wide, from which lines are drawn to connect with other nodes. Out of the apex of the triangle, which can be drawn pointing upward or downward, comes one line; this is the node's singular side. Out of the flat, longest side -- the plural side of the node -- come two or more lines; the lines are thus shown to be in a conjunctive relationship. The AND node shows combinations as opposed to alternations, which are shown by the OR node. AND nodes have two principal types:

Ordered AND

The lines on the plural side are to be read in sequence, left to right. This type of AND shows the relationship of concatenation. In this example, downward activation from A goes to B and later to C. Upward activation from B and later from C goes to A.

Unordered AND

A different type of combination in which the components are simultaneous. The multiple lines connect to the same point on the plural side of the triangle. In this example, downward activation travels through the line on the singular side, through the node, then down both lines on the plural side simultaneously. Upward activation travels up both plural-side lines simultaneously, then through the node and up the singular-side line.

The AND Node in Narrow Notation

(Description yet to be written.)

Sources

• LangBrain.
• Lamb, Sydney M., Pathways of the Brain: The Neurocognitive Basis of Language, John Benjamins, 1999.