Use of Speech-Generating Devices: In Support of Natural Speech.

Area of Science:

• Speech-Language Pathology
• Assistive Technology
• Developmental Psychology

Background:

• Caregiver concerns about augmentative and alternative communication (AAC) interfering with natural speech are common.
• Existing literature increasingly reports positive outcomes associated with AAC use.
• Evidence for negative impacts of AAC on natural speech is limited.

Purpose of the Study:

• To explore potential explanations for observed increases in natural speech production with AAC use.
• To discuss the clinical implications of AAC's impact on speech.
• To identify directions for future research in AAC and speech development.

Main Methods:

• Literature review and synthesis of existing research on AAC and speech.
• Analysis of anecdotal and published reports on AAC outcomes.
• Theoretical exploration of mechanisms underlying speech changes with AAC.

Main Results:

• Reports indicate positive effects of AAC, especially speech-generating devices, on natural speech.
• No widespread evidence supports the concern that AAC hinders natural speech development.
• Potential mechanisms include increased motivation, modeling, and cognitive engagement.

Conclusions:

• AAC use, particularly with speech output, appears to support rather than hinder natural speech development.
• Clinical practice should address caregiver concerns with evidence-based information.
• Further research is needed to fully elucidate the relationship between AAC and natural speech production.