Which form of sonnet uses a volta at the beginning of a sestet to introduce a contrasting idea?

In a piece, the volta is the turn of thought or contention: in Petrarchan or Italian works it happens between the octave and the sestet, and in Shakespearean or English before the last couplet.  

Italian work utilizes a volta toward the start of a sestet to present a differentiating thought.  

The Petrarchan or Italian piece, named after the fourteenth century Italian artist Petrarch, has the rhyme conspire ABBAABBA CDECDE. Variation rhyme plans for the sestet likewise incorporate CDCDCD and CDEDCE. There is normally a delay or break in thought between the octave and sestet called the volta, or turn.

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