'topicalization' definitions:

Definition of 'topicalization'

(from WordNet)
noun
(linguistics) emphasis placed on the topic or focus of a sentence by preposing it to the beginning of the sentence; placing the topic at the beginning of the sentence is typical for English; "`Those girls, they giggle when they see me' and `Cigarettes, you couldn't pay me to smoke them' are examples of topicalization"