Related Clues:

• Zener cards are used in it
• Clairvoyant's hurdle
• 1930s Rhine/Zener experiment
• Event seen early in 'Ghostbusters'
• Special-ability check that uses Zener cards
• It might employ Zener cards
• Experiment with Zener cards
• What you may pass if you solve this clue instantly?
• Attempt to confirm psychic powers