Replacing key subject words with demonstratives
(this, that, these, those).

Demonstratives can be used to refer to clauses, whole sentences, and even paragraphs.

Demonstratives were used in the model paragraph to refer back to the key subject of the text:

Information is received from the environment by a range of sensory registers that reside in sensory memory. The sensory receptors are modality specific: a register exists for each sensory modality such as vision, auditory and olfactory. These have the ability to transform stimuli from the environment into physiological representations, which can be understood and retained in the memory system. They therefore have a key role to play in human cognitive processing. Sensory registers also play a role in the larger system of memory.

Another Example