The Drosophila y maze is a behavioral test used to study learning and memory in the fruit fly Drosophila melanogaster. It is a simple and widely used experimental paradigm in which a fly is placed in a Y-shaped maze and given the opportunity to choose between two arms of the maze. The fly’s choice is recorded and the fly is then given a reward, such as food, in one of the arms. The fly is then placed back in the maze and given the opportunity to choose again. By measuring the fly’s choices over a series of trials, researchers can study how the fly learns to associate the reward with a particular arm of the maze and how this learning is affected by various genetic, environmental, and pharmacological manipulations. The Drosophila y maze is a powerful tool for studying the neural and genetic basis of learning and memory in the fruit fly and has provided important insights into these processes in both flies and other animals.