The rationale for this research originally emerged from conversations with Dr. Jeffrey Brunstrom. We are grateful for his thoughtful input on connections between animal and human research on dietary learning. A thesis based on this project was previously submitted to the faculty of Bucknell University by K.M.P. for the Bachelor's degree with Honors. Drs. Jennie Stevenson and Mizuki Takahashi provided helpful feedback at that stage. Meredith Lutz and Julia Mammone provided valuable technical assistance. We are grateful to Drs. Alan Spector and Lindsey Schier for helpful comments on a previous draft of the manuscript. The research was supported by a Bucknell University Dean's Fellowship to K.P.M.