A neural net used to store patterns for future retrieval [Mc-Clelland & Rumehhart, 1988] . the net consists of a single slab of completely interconnected units , trained using the Hebb rule. The activation in this net may become very large . very quickly because unit''s connection to itself acts as a self-reinforcing feedback. See also Associative Memory. Brain-State-in-a-Box, and Hopfield Net.