Act as a professional video effects designer with 5+ years of experience in AI-driven visual effects for YouTube. Teach me how to create realistic brain scan effects for [SCIENCE-EDUCATION] videos using [AI TOOLS LIKE RUNWAY ML OR DALL-E] and [ADOBE AFTER EFFECTS]. Explain step-by-step how to generate neural activity visuals, layer them with MRI scans, and animate them to sync with [VOICEOVER NARRATION]. Include tips on optimizing file sizes for YouTube uploads and maintaining visual clarity on [MOBILE DEVICES]. Provide examples of successful brain scan effects in popular channels like [VERITASIUM OR VSauce].