... retention; and getting at the information when needed, or retrieval. The computer's processing speed decided part of its quality. Therefore, the processing speed of human was vital to humanbeen. This time, the speed of processing spatial information will be examined in term of a cognitive ability. This ability varies for different individuals with different personality, intelligence, gender, and age, etc. It was also different for different information circumstances: such as the complexity of task content, how familiar the subject gets with the context, where the task takes on etc. The age-related slowing was supported by Surwillo (1968) who earlier suggested that the slower performing in the elderly might be explained by an age-related decrease in the speed of an internal timing mechanism responsible for coordinating neural activities. An investigation (S. Rubichi, M. Neri, R. Nicoletti, 1999) compared the mean-reaction time performance of two groups of subjects (young vs. elderly), the ...

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