Rub My Foot and I'll Take a Bite

We've been introducing solid food (or to her new toys) to Lizzie for a couple of weeks now. Every now and then she'll take a spoonful, but most of the time she'll blow raspberries as we try to put the spoon in her mouth. This last weekend we discovered a trick to getting her to eat. We rub her foot! She'll open her mouth, take the food and swallow when her foot is being rubbed. When I get a little more time, I'm going to do some research to see if there is a cause and effect really occurring or whether this trick is just a fluke.