This type of MR scan exhibits fluid-tissue contrast. Stationary water (like cerebrospinal fluid) appears white, while brain tissue is darker. Blood vessels are black, as the magnetized protons have been flushed away by the time of the measurement. The provided images have been recorded in 0.67 mm resolution. For more information on this image type see Wikipedia. The complete description of this acquisition has been published in:
Hanke et al. (2014). A high-resolution 7-Tesla fMRI dataset from complex natural stimulation with an audio movie. Scientific Data, 1.