Describe the different brain-imaging techniques that can be used to identify specific deficits and brain abnormalities.

Key terms and concepts that may be included in student responses:
▪ Computerized tomography (CT)-brain structure rather than brain activity; exposes patients to radiation.
▪ Positron-emission tomography (PET)-shows brain activity; requires injection of harmless radioactive dye.
▪ Single photon emission computed tomography (SPECT)-similar to a PET, but uses a different injectable tracer compound; less expensive, but also less accurate.
▪ Magnetic resonance imaging (MRI)-gives brain structure (fMRI gives brain activity)and doesn't require any exposure to harmful radiation or other compounds.