Abstract
The brain adopts various kind of neural coding in accordance with the structure of the external information space and the property of the required information processing. In peripheral regions, rigidly structured codings such as columnar or hypercolumnar structures are known. On the other hand, there are experimental results which suggest that a more flexible and loose codings are used in the brain area where associative information processing and memory are included. In this paper, it is proposed that a sparsely coded associative memory using a non-monotonic neuron model is a promising candidate of the brain coding in the inferio-temporal area which takes an important role in the delayed matching task.
