summarize this in a sentence or two; In the new study, the researchers added additional training to the Stable Diffusion algorithm using an online data set provided by the University of Minnesota, which consisted of brain scans from four participants as they each viewed a set of 10,000 photos. A portion of these brain scans from the same four participants were not used in training and were used to test the AI system later. Each AI-generated image starts out as noise, reminiscent of TV static, and replaces the noise with distinguishable features as the Stable Diffusion algorithm compares a person's brain activity patterns from viewing a photo with the patterns in its training data set. The system effectively generates an image depicting the contents, layout, and perspective of the photo being viewed. Takagi says the new system was more efficient than previous ones, required less fine-tuning, and could be trained with a smaller data set