This book showcases recent trends in brain-computer interface development. It highlights fascinating results in areas such as speech neuroprotheses, bionic hands, memory enhancement, and the development of optical BCIs . The contributions describe the three winning projects and other nominated brain-computer interface projects selected by the expert international jury of the BCI Award 2023. In the book, each project is described in detail by the team of scientists behind it, and the editors provide a concluding discussion of the highlights and overall progress in the field.