Examlex
Systematic errors are due to chance fluctuations.
Brain Waves
Patterns of electrical activity in the brain, indicative of different states of consciousness, such as wakefulness or sleep.
Positron-Emission Tomography
A diagnostic imaging technique that uses radioactive substances to visualize and measure changes in metabolic processes.
Biochemical Activity
The chemical processes and reactions that occur within living organisms.
Radioactive Element
An element that spontaneously emits radiation as a result of the decay of its atomic nuclei.
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