Dr. snell studies the part of the brain that is active when people are lying. she asks half of her participants to tell the truth about an event from their childhood and half to tell a lie about a childhood event. which of the following brain imaging techniques should she use to detect brain areas that are active when participants are lying?

Functional MRI.

Explanation:

Functional MRI (magnetic resonance imaging) may be defined as a technique used to measure the activity of brain with the blood flow. This technique works on the principle that neuronal activation and blood flow are coupled with each other.

The brain part become active when people starts lying and their blood flow increases. The functional MRI technique is used to detect the brain area that increases when participants told lie because this technique depens on blood oxygen level.

Thus, the answer is functional MRI.