What is an example of an unaided AAC system?

An unaided AAC system includes methods of communication that do not rely on external tools or devices. Sign language and gestures fall into this category because they utilize only the individual's body for communication. These methods are fundamentally expressive, allowing users to convey messages through movements or established signs without needing technology or additional objects.

In contrast, other options like speech-generating devices, writing boards, and text-to-speech software represent aided systems, as they require some form of equipment or technology to facilitate communication. Thus, sign language or gestures are the quintessential examples of an unaided AAC system, showcasing the pure capability of human expression without additional aids.