The theory that explains the power of spaced learning stems at least in part from what we have learned about the importance of retrieval practice. One of the challenges to our memories is the ability to pull desired information from our long-term memories when we need it. The more times we practice drawing specific skills or information from our long-term memory, the better we get at it. When we engage in massed learning exercises, focusing on one set of content repeatedly, we never have to access the learned material from the deeper recesses of our long-term memory. By contrast, if we use
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