What do you mean, "delve into"? Do you mean, do a PhD thesis on? Do a presentation on for a class? Get a research project? Just interesting to read about?
If you're looking for a research topic, stop. Start looking for a compatible research mentor instead. Much more productive for you. A good person in a field you're only slightly intersted in is much better than someone who doesn't really care about you in something you find exciting.
As for a cool topic for a presentation... I always find discussions of the molecular mechanics of the synapse to be interesting. Lots of different ways for people to look at it (electrophysiology, molecular approaches, modeling, etc.). Mechanisms of learning and memory are always fun and topical (and there are lots of ways to approach those, too). Sensory systems are always good, too; especially hearing and olfaction, I think.
Good luck.