The ________ signal shows differences in brain activity levels in one condition versus another condition in an fMRI experiment.

A) electroencephalographic (EEG)
B) transcranial differential (TD)
C) blood oxygen level dependent (BOLD)
D) perfusion imaging (PI)

Blood Oxygen Level Dependent (BOLD)

A measure used in functional magnetic resonance imaging (fMRI) to observe brain activity by detecting changes in blood oxygenation.

Electroencephalographic (EEG)

A non-invasive method that records electrical activity of the brain, widely used in neuroscience research to examine brain function.

Perfusion Imaging (PI)

A diagnostic imaging technique that measures the flow of blood through the body's tissues, often used in neurological and cardiac assessments.