How the virtual water maze works

Take away the water, keep the logic. A virtual water maze puts a person in a computer-built arena with the same three ingredients as the rodent pool: a bounded space, landmarks in the distance and a goal they can't see.

The arena

Most designs use a circular room or an open courtyard. The landmarks sit outside the arena and never on the floor beside the goal, so the participant has to use the arrangement of cues rather than homing in on a single beacon.

Three ways to show it

• Desktop: keyboard or joystick. Cheap and portable, but the body never moves.
• Seated headset: natural head turns, still no walking.
• Immersive walking VR: systems such as HVS 6D VR, where people walk and turn for real, so vestibular and body-based cues come back into play.

How a session unfolds

1. Practice in a neutral room until the controls feel easy.
2. Learning trials from varied start points; the goal appears, or signals success, once it's reached.
3. A probe trial with no goal at all, scored by where the person searches.
4. Optional extras: reversal, a visible-goal control or cue-conflict trials.

What gets recorded

Position and facing direction, many times a second, each with a time stamp. That's what lets you run the same analyses you'd use in the rodent pool.