Which brain imaging technologies were prominent in the 1980s?

• A. fMRI and PET
• B. EEG and CT
• C. X-ray and ultrasound
• D. SPECT and DTI

Answer: (A)

Understanding this question means looking at which technologies were the major ways researchers studied brain activity and structure in that era. Positron emission tomography provided a mature, widely used way to image brain metabolism and function in the 1980s, making it a key functional modality of the time. Functional MRI emerged from late-1980s research and then became dominant in the 1990s, so it is considered alongside PET as a defining functional imaging technology of that broader period. The other options mix modalities that aren’t primarily brain imaging tools for that era (EEG measures electrical activity rather than imaging, X-ray and ultrasound are not core brain imaging methods) or refer to techniques that became prominent later (DTI) or were more limited in that decade (SPECT).