T., My daughter did the exact same thing. Went into a corner to poop instead of using the potty--even thought she would urinate independently on the toilet. We decided to just be matter of fact about it..say "Oh, you went poop. Let's take care of this." Then we would go in the bathroom, take off the pullups, show her how we emptied the poop into the toilet, and let her flush it. (she liked this part--some kids don't and some experts suggest that some children fear the flushing part as losing a part of themselves into the toilet.) Then we would say something like "this is where you can poop when you are ready." No fussing or discipline or disappointed tone of voice. The key was that we put no pressure on her. At the same time, a friend of mine suggested doing a "reward chart"--so we told her that she would get a sticker on her chart (located on the back of the bathroom door, so she could see it when on the potty) every time she pooped on the potty. For every 5 stickers, she got some kind of treat (going to a friend's house to play, dinner at the pizza place, etc) For every 15 it was something big--like the zoo, the amusement park, the aquarium, a movie, etc. In about 2 months, she was going on the potty every time. I am not sure if it was the low key responses, or the reward chart--but, something worked. Also, she was almost 4 at the time. This was not an issue with the older daughter at all. Every child is different; I wouldn't worry that it is a psychological problem. It is a big change for a child to transition to pooping on the potty--and don't we all naturally resist change to some degree?!?!?! Good luck and best wishes to you. A good friend's comment at the time was "By kindergarten, every child poops on the potty!" I took my comfort from that! Hang in there and try not to worry.