Introduction to fMRI

Introduction to MRI and Safety00:00:11

Magnetic resonance imaging (MRI) is a diagnostic method utilizing powerful magnetic fields to map brain activity. Due to the intense magnetic force, strict adherence to safety protocols is required to protect participants.

Participant Preparation and Procedure00:01:17

Before the 45-minute scanning process, participants undergo screening via a questionnaire. Inside the machine, participants are provided with a squeeze bulb to signal discomfort and a button box to perform research-specific decision-making tasks, with a strong emphasis on remaining still to ensure data quality.

The Physics of MRI Scans00:02:54

The MRI process relies on the hydrogen nuclei in the body. The machine uses a static magnetic field to align these nuclei, then uses radio frequency energy pulses to excite them. As the nuclei return to a resting state, they release energy that is detected and coded by a computer into an image.

Functional MRI (fMRI) and the BOLD Response00:04:24

While structural scans provide a baseline anatomy, fMRI is used to track brain function by measuring the BOLD (Blood Oxygenation Level Dependent) response. This tracks increased oxygenated blood flow to specific regions during decision-making tasks.

Final Safety Reminder00:05:58

A critical safety rule is strictly emphasized: no metallic objects of any kind are permitted within the MRI scanning area due to the immense strength of the magnet.