Biological Bases Of Behavior Practice Test

Measuring metabolic activity with a glucose-like tracer during task performance is done with PET imaging. In practice, a radioactive glucose analog (usually FDG) is injected, and active brain regions—areas that consume more glucose—take up more tracer. The PET scanner then detects the emitted radiation from the tracer and creates a map showing where glucose metabolism is higher, giving a functional snapshot of which areas are engaged during the task. This direct link to energy use makes PET particularly suited for studying functional activity tied to metabolism, though it reflects a longer time window due to how the tracer distributes and clears. Other imaging methods focus on different signals. MRI (including functional MRI) reveals structure and, for activity, blood flow changes rather than direct glucose use. CT scans show anatomy. EEG records electrical activity instead of metabolism.