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STM |
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STM(Scanning Tunneling Microscope) A microscope that can image down to the atomic level. An STM uses a piezoelectric tube with a tiny sharp tip at the end that is moved within nanometers of the object being sampled. As it gets close, the voltage applied to the tip causes a "tunneling" current to flow to the object. As the tip is moved and bumps into an obstruction, the current changes. In order to maintain a certain constant current, the tip is raised and lowered accordingly, and this movement pattern is magnified and displayed on screen. See AFM. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In both cases, the brain functions were substantially improved; specifically, immediate memory and concentration in the normal elderly and immediate memory and short-term memory of those who have organic brain disorders. Standardized assessment tools included digit span backwards, which tests working memory, and Repeatable Battery for Assessment of Neuropsychological Status (RBANS), which evaluates five cognitive areas: immediate memory, delayed memory, attention, spoken language and visuospatial perception. |
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