To what extent is the information provided by speechreading and by hearing aids redundant?

• Amplification and speechreading provide somewhat redundant information.

• • Hearing aid provided information primarily about place-of-articulation. Smaller gains over unaided hearing were achieved for voicing and manner cues.
  • Speechreading provided substantial improvement over unaided hearing for place and some improvement for manner. No benefit for voicing.

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