Visual abilities are important for auditory-only speech recognition: evidence from autism spectrum disorder

Area of Science:

• Neuroscience
• Psychology
• Speech and Hearing Sciences

Background:

• Auditory-only speech recognition is crucial for effective communication.
• Prior research indicates that knowing a speaker's face improves auditory-only speech recognition.
• The role of lip-reading ability in this enhancement is not fully understood.

Purpose of the Study:

• To investigate whether the benefit of speaker familiarity on auditory-only speech recognition relies on lip-reading skills.
• To compare speech recognition abilities in adults with autism spectrum disorder (ASD) and typically developed controls.

Main Methods:

• Participants learned to identify speakers by voice, with some speakers learned via video (face) and others without face.
• An auditory-only speech recognition test was administered, followed by a speaker identity recognition task.
• Visual experiments assessed lip-reading and face identity recognition in both groups.

Main Results:

• Typically developed controls showed improved speech recognition for speakers learned with face vs. without.
• Adults with ASD did not exhibit this benefit; their performance was worse when speakers were learned with face.
• ASD group had deficits in lip-reading but not face identity recognition, and poorer overall speaker identity recognition.

Conclusions:

• Auditory-only communication benefits from dynamic visual information, including lip-reading.
• In ASD, difficulties with lip-reading may prevent the visual enhancement of auditory-only speech recognition.
• Impaired integration of visual cues may underlie communication challenges in ASD.