How do neuroscientists use brain scans to study thought?

Neuroscientists use advanced imaging and recording techniques to study thought by linking mental states to specific patterns of brain activity.

• Functional Magnetic Resonance Imaging (fMRI): This technique detects changes in blood flow within the brain. By comparing brain activity during resting and activated states, fMRI generates detailed maps that show which areas "light up" when a person performs mental tasks, experiences emotions, or generates thoughts.12
• Positron Emission Tomography (PET): PET scans involve injecting a radiopharmaceutical to measure biochemical processes, such as glucose metabolism and oxygen uptake. This allows researchers to observe how the brain functions during complex activities like learning and language use, as well as how it is affected by various disorders.3
• Electroencephalography (EEG): Rather than imaging blood flow, EEG records the electrical activity of the brain via electrodes on the scalp. It captures voltage fluctuations, such as event-related potentials (ERPs), which provide a precise timeline of how the brain processes information, registers sensory input, and allocates attention.4

These methods allow scientists to bridge the gap between biological neural activity and the subjective experience of the mind.2