New, incredibly detailed videos capture how the brain jiggles inside the skull as blood and other fluids flow through the squidgy organ.

In two new studies, published May 5 in the journals Brain Multiphysics and Magnetic Resonance in Medicine, scientists employed a brain-scanning technique often used to capture static, 2D images of organs to instead create 3D videos of the brain moving in real-time. The brain tissue can be seen pulsating in reaction to blood rushing through its blood vessels and cerebrospinal fluid (CSF), a clear liquid that carries nutrients and cushions the brain, flowing in and around hollow spaces in the organ.