As with Academic Search Complete, look for the Subject Terms index. In PsycINFO and PsycARTICLES, it's called the Thesaurus, and it's at the top of the page in the menu bar.
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When you click "Thesaurus," you get a new box with the option to search for subject terms. Let's search for "memory."
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This will get you a new box with links to "memory" and associated terms:
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You can add terms to your search by clicking the box on the left of the subject term, then clicking "Add to search" at the bottom of the box.