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In page David W. Tank:

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While at Bell Labs, Tank was involved in the development of functional MRI imaging technology; with Seiji Ogawa and others, the team published a series of papers first establishing the BOLD signal method of measuring brain activity.[1] Tank's research interests at Princeton have recently focused on the physical mechanisms of neural circuit dynamics, particularly those that underlie short-term memory of motor activity in animal models. The group also develops laboratory methods and technologies in microscopy.[2]