For each trial, single fish were isolated in the start box and
allowed 2 min to settle before the door into the maze compartment
was opened. Timing of each trial began when the fish left the start
box. The time taken to reach the reward chamber and the total num-
ber of mistakes made en route (i.e. dead-end doorways entered)
were recorded. Fish continued single trials until they reached a cri-
terion level of performance. This criterion was to successfully move
through the maze on three consecutive trials in under 75 s where
they made one or no errors. The number of trials taken to reach
criterion was noted.