A cerebral organoid describes artificially grown, in vitro, miniature organs resembling the brain. Cerebral organoids are created by culturing human pluripotent stem cells in a three-dimensional structure using rotational bioreactor and develop over the course of months. The procedure has potential applications in the study of brain development, physiology and function. Cerebral organoids may experience "simple sensations" in response to external stimulation and neuroscientists are among those expressing concern that such organs could develop sentience. They propose that further evolution of the technique needs to be subject to a rigorous oversight procedure. In 2023, researchers have built a hybrid biocomputer that combines a laboratory-grown human brain organoids with conventional circuits, and can complete tasks such as voice recognition. Cerebral Organoids are currently being used to research and develop Organoid Intelligence (OI) technologies.