Backward masking

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Backward masking has several meanings:

  • The original meaning of the term, in psychoacoustics, refers to temporal masking of quiet sounds that occur moments before a louder sound.
  • A similar meaning, in use in cognitive psychology, refers to the use of a bright visual stimulus immediately after a single-frame visual stimulus containing a subliminal message. This prevents the viewer from seeing an afterimage of the frame, which would allow a conscious evaluation of the subliminal message. (See psychorama).
  • In popular music, "backward masking" incorrectly refers to backmasking, or hiding messages in sound recordings that are audible when played backward.
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