MRI scan showing a brain tumour. The tumour appears in bright contrast to the surrounding brain tissue. Photo credit: Simon Fraser/Neuroradiology Department, Newcastle General Hospital/Science Photo Library.

participants have to be injected with radioactively labelled water. Fourth, it can be hard to interpret the findings from use of the subtraction technique. For example, it may seem plausible to assume that those parts of the brain active during retrieval of episodic memories but not other kinds of memories are directly involved in episodic memory retrieval. However, the participants may have been more motivated to retrieve such memories than other memories, and so some of the brain activity may reflect the involvement of motivational rather than memory systems.

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