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Psychological studies of human-computer interactions have focused, for the most part, on attempts to understand the nature of human cognition and learning. Some of the issues that are frequently discussed in the formulation of these studies are:

The nature of memory and
    mental structures
Learning and problem
    solving strategies
The nature of conscious and
    unconscious attention
The role of language
    in cognition
Response time & time to learn Encoding processes
The nature of errors "Gulfs of understanding"