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The passage given below is followed by four alternate summaries. Choose the option that best captures the essence of the passage.

McGurk and MacDonald $(1976)$ reported a powerful multisensory illusion occurring with audio-visual speech. They recorded a voice articulating a consonant ‘ba-ba-ba’ and dubbed it with a face articulating another consonant ‘ga-ga-ga’. Even though the acoustic speech signal was well recognized alone, it was heard as another consonant after dubbing with incongruent visual speech i.e., ‘da-da-da’. The illusion, termed as the McGurk effect, has been replicated many times, and it has sparked an abundance of research. The reason for the great impact is that this is a striking demonstration of multisensory integration, where that auditory and visual information is merged into a unified, integrated percept.

  1. When the quality of auditory information is poor, the visual information wins over the auditory information.
  2. The McGurk effect which is a demonstration of multisensory integration has been replicated many times.
  3. When the auditory speech signal does not match the visual speech movements, the acoustic speech signal is confusing and integration of the two is imperfect.
  4. Visual speech mismatched with auditory speech can result in the perception of an entirely different message: this illusion is known as the McGurk effect.
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