Found Short Stories, Volume 1

(Found in Biological Science: A Molecular Approach, ed. by Hugh P. McCarthy.)

The simplest kind of maze is the T-maze, where only one choice is involved. Flatworms and earthworms can learn to make the "correct" choice of turns in this maze. Earthworms, for instance, are given the choice of entering a dark, moist chamber or of receiving an electric shock. The earthworms in an experiment took about 220 trials in the maze to learn to make the correct turn.