Working memory capacity is closely related to general intelligence. This has been observed in several different studies that evaluate the correlation between measures of intelligence and working memory.
A study published last week affirmed this finding, and also furthered our understanding of the factors underlying working memory capacity. Awh, Barton, and Vogel’s research showed that working memory capacity (on average, about 4 items) is not affected by the complexity of the items remembered. More complex stimuli will be remembered with less detail, but the amount of information remembered is about the same.
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