and word association spaces (WAS). The LSA method states that similarity between words is reflected through their co-occurrence in a local context. WAS was developed by analyzing a database of free association norms, and is where "words that have similar associative structures are placed in similar regions of space".

ACT-R: a production system model

The adaptive control of thought (ACT) (and later ACT-R (Adaptive Control of Thought-Rational)) theory of cognition represents declarative memory

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