1695	 PLEXUS-An On-Line System for Modeling Neural Networks	 A description is presented of PLEXUS a system which enables a user to construct and specify a neural network to analyze the output data produced by the network and to store and retrieve networks and data from a library. The system operated entirely from a digital display unit interacts directly with the user and permits easy and rapid transitions between the various phases of the modeling process. PLEXUS is designed to complement neurophysiological research so that the systematic development of neural models can be coordinated with experimental work. PLEXUS networks are built up from components representing individual neurons external stimuli and interconnecting fibers each component being of a relatively detailed nature. Provision is also made for the use of experimental data as input to a network. Convenient means for specification and modification of a network and extensive error-checking capabilities are provided. Data resulting from the simulation of a network may be analyzed by a variety of techniques ranging from examinations of the gross characteristics of the data to the determination of detailed statistical properties. biological modeling data analysis discrete system simulation library systems modeling network simulation neural networks neurophysiological models on-line simulation simulation
