Here's a picture of the stems. Sorry if it's kind of bad. Anyway, I decided to read up a bit on how to tell Aglaonema apart from Dieffenbachia, and since the new leaves on my plant are emerging from the petioles of previous leaves, I'm now starting to get the impression that this is actually a Dieffenbachia, not an Aglaonema. A second opinion on this would be helpful, of course.
That is not the growth pattern of Dumb Cane but Aglaonema. Wait for others to give feed back. Dieffenbachia as the name Dumb Cane suggests looks like a cane. The dumb part is if you chew on any part dumb is the side effect.
My goodness, I'd totally forgotten about this post. Anyway, for those who were wondering, I'm going with the notion that it's a Dieffenbachia. Thanks, guys, and sorry for taking months to reply. The plant is still doing okay, for those curious.