On not being noticed: intellectual disabilities and the nonvocal register.

Researchers watched adults with intellectual disabilities in a group home. The adults had little or no speech.

The team wrote down every nonvocal move the residents made. They also noted when staff saw or missed the move.

Residents used clear gestures to start, stop, or refuse activities. Staff ignored most of these silent bids.

Because the gestures were missed, the adults looked "unengaged" even though they were trying to talk.

Redquest et al. (2021) extends this idea. Their eye-tracking study shows adults with ID also understand subtle spoken cues that staff rarely test.

Raslear et al. (1992) and Chiang (2008) used the same watch-and-write method. All three papers list small signals—eye-gaze, brief gestures—that get skipped in daily care.

Chiang (2009) adds the teacher side: even when staff prompt, kids give few responses. Together the studies say the problem is not a lack of skill; it is a lack of detection.

If you work with non-speaking adults, slow down and scan for tiny movements. A head turn, shoulder shift, or eye close can mean "no." When you answer these moves with action or words, you prove to the resident that communication works. This single change can cut "problem behavior" that is simply a loud replacement for quiet, ignored gestures.