I took four years of drama, shy soul that I am. And we talked a little about this at the Saturday writing meeting.
It works in writing. Really. Here's how.
Take the POV character in the scene you're in. Figure out this character's deepest emotion during the scene. Now think about yourself and when you've experienced this emotion.
Example: Heroine brings hero a sandwich but he doesn't notice her as anything but a friend.
Maybe this hasn't happened to you. Maybe you're a hottie and all guys notice you. :-) But think about rejection. Has there been a time in your life when you felt left out? Undervalued?
As you remember this moment in your life, take note of what happens with your heartbeat. Does your skin prickle? Does your mouth dry? Do you feel like running away or screaming?
Every character is different, make sure their responses fit their personality, but use your past to add life to their drama.
Feel what your character feels. Be that character, if only for a scene.
When people (or characters) do things you don't agree with, do you have trouble being empathetic or can you see themselves in their shoes? Ever hated a character so much that you just didn't want to feel what they do? How would you write the physical accompaniments to hatred?