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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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From Sensory Registers<br />

Echoic Reg. Iconic Reg. Other Reg.<br />

Decay Decay Decay<br />

Decay<br />

Decay<br />

Short Term Memory<br />

Long Term Memory<br />

Fig. 2.3: Three-level hierarchical model of cognitive memory.<br />

STMs have faster access time [1] than LTMs. Therefore, for the purpose<br />

of generating inferences, useful <strong>info</strong>rmation from LTMs is copied into STMs.<br />

This has been shown in fig. 2.3 by a feedback path from LTM to STM.<br />

Because of its active participation in reasoning, STMs are sometimes called<br />

active memory.<br />

The hierarchical structure of Atkinson-Shiffrin’s cognitive memory model<br />

can be compared with the memory systems in computers. The STM is similar<br />

with cache, while the LTM could be compared with main (RAM) memory. The<br />

reasoning system in the human brain is analogous with the central processing<br />

unit (CPU) of the computer. The reasoning system fetches <strong>info</strong>rmation from the<br />

STM, as CPU receives <strong>info</strong>rmation from cache, when the addressed words are<br />

available in the cache. In case the addressed words are not available in cache,

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