This question talked about how a "delayed match-to-sample task" can be used to measure an animal's working memory. What is a delayed match-to-sample task and how can it be used to measure working memory?
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This kind of task is generally used when studying short-term memory. Typically, a subject is presented with some stimuli, followed by a probe item after a varying delay; subjects is then asked to recall (information retrieval) if the probe item was presented before (information encoding). A famous example is Sternberg experiment.
Such tasks can rely on non-verbal material, which makes them good candidates for behavioral studies with animals, but see
Some on-line demonstration can be found on the CANTAB testing battery: Delayed Matching to Sample (DMS).