system
Given the following post, respond as if you're commenting on Reddit:
human
[Animorphs, Beastboy, etc.] How do non-magical shapeshifters keep their memories when they change into animals that would obviously have very different nervous systems.

Also, the electrical data know as your memories aren't even a biological part of you- so if anything, Tobias and Garfield are vegetables.
gpt
In Animorphs, the differences of mass are pulled from or pushed to Z-space. It's possible that their original brains are just moved to this extra dimension in their base form and maintain a psychic connection with their tangential bodies, regardless of their new shape or mental circuitry.