You will read a short passage, listen to a talk, and answer a question about

Now listen to part of a lecture in a psychology class.
    OK, so I’ve got a good example of this. When my son was young—three or four years old, I bought him some wooden blocks to play with so that he could build things with them. And he wanted to stack all of them up——build a tower with the blocks by stacking them all one on top of another. So at first he started stacking the blocks, but after he started, they fell over and it made him mad. He started throwing the blocks around and crying and he called for me to come and help him build the tower, so I came over right away and helped him stack up the blocks. Everyday my son would try again at building the tower, but each day when the blocks fell over and he called me to help him, rather than going to help him right away when he called, I waited a few minutes longer before going to help him. Everyday I’d wait a few minutes longer than I’d waited the day before. As a result of this, my son would just start trying to stack the blocks again himself, rather than waiting for me. He’d keep trying himself until finally, after a couple of weeks, he managed to stack all the blocks, build a whole tower with them, completely on his own without my help.