The person's ability to track happens at about the same time that swallowing does in ACL 1.4. Tracking and sitting up for at least 15 minutes can be used as the prerequisites for swallowing. The person is able to follow a sensory cue as it changes location. Visual and auditory tracking is accompanied by swallowing and sitting in a chair with total support of their head and trunk.
Things that produce sounds vary. Everyday objects can produce a sound. It can vary in volume and pitch. If the person has a favorite instrument see if a relative will bring it in if it is portable. Find recordings of their favorite familiar music. Keep beats and rhythms simple. Other sounds that capture attention are things like bike bells.
Taste preference is also very individualized. You may have siblings with very similar backgrounds who have very different food preferences. This preference can also occur in people with a cognitive disability. Give them a variety of tastes to awaken their senses. Of course, adhere to swallowing precautions. Some strong taste experiences are salty, sour, sweet and bitter.
A person's sense of smell may diminish as their cognition drops. The smell will have to be very strong in order to gain their attention. Mustard, garlic, lemon, perfumes and various herbs and spices produce strong distinct smells.