Morris Water Maze Visible Platform

The Morris water maze visible platform (cued) task serves as an essential sensorimotor and motivational control procedure that accompanies spatial learning experiments in the hidden-platform version of the water maze. In this protocol, the escape platform protrudes above the water surface or is marked with a visible flag or contrasting object, allowing the animal to locate it using direct visual guidance rather than distal spatial cues. Performance on this task verifies that the animal possesses adequate visual acuity, motor coordination, and motivation to swim and escape, which are prerequisites for interpreting spatial learning deficits observed in the hidden-platform task.

The principal measures are escape latency, path length, and swimming speed across a small number of trials (typically 4-8 across 1-2 days). Because the platform is visible, healthy rodents rapidly learn to swim directly toward it regardless of start position, and latencies drop to near-asymptotic levels within 4-6 trials. Animals with visual, motor, or motivational impairments fail to show this rapid learning, indicating that any deficits in the hidden-platform task may not reflect pure spatial memory impairment. The platform location is typically varied across trials to prevent spatial strategy use.

ConductMaze tracks the visible platform task with the same overhead camera and water maze calibration used for spatial reference memory testing. The software computes escape latency, path length, swim speed, heading error, and thigmotaxis from the continuous tracking data. Platform zone detection automatically records when the animal reaches the visible platform, and trial-by-trial performance graphs are generated in real time to allow experimenters to assess sensorimotor function before proceeding to spatial testing.