Their attention is captured by strong sensory cues, one sensation at a time. The definition of strong sensory cues is by example under the following subheadings that are organized by sensation for convenience.
Motor control is limited to the face and includes the eyes (pupils focused on a cue, blinking), nose (sniffs) and mouth. Observations around the mouth include pumping their tongue in and out of mouth, drooling, gag reflexes, salivating, sucking, pursing and retracting their lips. If they turn their head, it will probably be less than sixty degrees, total.
Place yourself where you can watch the pupils of the person's eyes because attention to and use of information is observed best by watching pupil movements, beginning with ACL 1.2.
Communication is non-verbal and includes smiles, frowns and widening their eyes. The word "no" is usually the first word spoken, but not until ACL 1.8. Within ACL 1.2, groaning and yelling is usually wordless. Sighs of pleasure may be heard by careful observers and are appreciated when family members and friends learn to wait for them.
The common response time of 20 seconds is so slow that many people use a stop watch (on your smart phone) to learn how to wait long enough. Warning: Do not confuse slow response times with the speed of startle reactions that happen very fast.