RAS RESEARCH VIDEO
RESEARCH, GRAPHICS, PRESENTATION
2025
SNIPPET
INTRODUCTION
I wanted to understand why something as simple as a metronome could change how a Parkinson's patient walks, so I spent the better part of my senior summer researching Rhythmic Auditory Stimulation (RAS) and turned what I learned into an animated explainer that placed in the top 10% of video submissions for the Khan Academy Breakthrough Junior Challenge. The research side meant tracing the actual neurological chain of how Parkinson's degrades neurons in the substantia nigra pars compacta, how that cuts dopamine output to the basal ganglia, and how that imbalance breaks the direct/indirect pathway system the brain uses for movement timing. RAS doesn't fix any of that. It routes around it, using the auditory cortex's connection to the premotor cortex as an external timing signal that the basal ganglia can't reliably produce on its own anymore.
DESIGN CHOICES
I built the video in After Effects and skipped the usual organs-and-arrows medical look, since a breakdown of the Parkinson's pathway isn't something you can show literally. Instead, I built three metaphors: the substantia nigra as a dopamine factory, the basal ganglia as a fork in a road, and RAS as a flashlight cutting a shortcut through a maze wall. The road metaphor was the strongest, since it covered the direct/indirect pathway split, so I kept reusing it instead of inventing a new visual system for every slide. Color coding was a necessity more than a style. By the RAS section, I had sound, movement, dopamine, and pathway type all on screen near each other, and without a consistent color per concept, the viewer would lose track of which line was which. Text stayed heavy-outlined throughout so the video reads with the sound off. For the slide connecting the auditory cortex to the premotor cortex, I went with a single continuous loop, ear to cortex to movement, instead of labeling out the full anatomical pathway. A labeled diagram would have been more accurate but harder to read at a glance, and for a 90-second explainer, the simpler shape was the right tradeoff.