Auditory closure is a process of filling in the missing pieces of the figure.

Exercises can be created to target sounds embedded in varying degrees of background noise. These can be both fun and productive in developing these skills.
One clever battery of training exercises was developed, for example, by the Alameda County School Department in California. Some excerpts from this and the Goldman-Fristoe-Woodcock Test batter are in the Notes.

2. Auditory Closure. Often the noise, (another word for ground) which accompanies the signal (another word for figure), actually obliterates some of it. Quite often it is the higher frequencies which are lost. For the speech signal, this tends to mask many of the consonant sounds. A person with a high frequency loss experiences this loss all the time.