Contrastive Stress

Phonology

Contrastive stress is the placement of prominence on a particular word to contrast it with an alternative — either explicit or implied. It overrides the default sentence stress pattern and shifts the tonic syllable to signal the speaker's intended focus.

How It Works

In English, default sentence stress typically falls on the last content word in a tone unit:

I bought a new BOOK. (default, broad focus)

Contrastive stress moves the main prominence to whichever element the speaker wishes to highlight as different from what was expected or said:

Contrastive stress placement	Implied contrast
I bought a new book.	Not someone else
I BOUGHT a new book.	I didn't steal/borrow it
I bought a NEW book.	Not a second-hand one
I bought a new BOOK.	Not a magazine (default position, so this is ambiguous with neutral stress)

Prosodic Realisation

Contrastive stress is realised through the same acoustic cues as any prominence, but typically with greater intensity:

Pitch: A marked pitch movement (often a sharp fall or rise-fall) on the contrasted word
Duration: The stressed syllable of the contrasted word is lengthened
Loudness: Slightly increased
De-accentuation: Crucially, material after the contrastive focus is de-accented — pronounced with flat, low pitch and reduced prominence

This de-accentuation is the clearest signal that contrastive stress has occurred. Compare:

I bought a RED book. (contrastive: RED falls sharply, book is flat/low) I bought a red BOOK. (default: BOOK carries the main pitch movement)

Functions

Correction

The most obvious use — correcting a misunderstanding:

A: You went to Paris? — B: ROME. I went to ROME.

Selection from a Set

Choosing one item from an explicit or implied set:

Do you want tea or coffee? — TEA, please.

Emphasis or Surprise

She actually PASSED the exam! (against expectation)

Addition of New Information Against Given

A: John bought a car. — B: And MARY bought a house. (MARY is new; the buying frame is given)

Interaction with Intonation

Contrastive stress interacts with intonation patterns:

A falling tone on the contrastive element signals definitive correction: I said ↘RED, not blue.
A fall-rise may signal contrast with reservation: I ↘↗LIKED it... (but I wouldn't buy it)

L2 Difficulties

Vietnamese Learners

Vietnamese uses word order, particles, and lexical means to signal contrast rather than prosodic prominence. Vietnamese learners commonly:

Fail to shift stress to the contrasted element
Use default stress patterns where contrastive stress is needed
Do not de-accent post-focus material
May add explicit lexical markers (not A but B) instead of using prosodic contrast

General L2 Issues

Many learners stress every content word equally, making contrastive focus indistinguishable from default stress
De-accentuation is particularly hard to acquire — it feels "wrong" to reduce material that still has semantic content
In languages with fixed word-order focus marking (e.g., cleft constructions), learners may rely on syntax instead of prosody

Teaching Implications

Teach contrastive stress through meaningful contexts — correction tasks, spot-the-difference activities, information-gap tasks where learners must contrast items.
Demonstrate de-accentuation explicitly: model I said RED book, not BLUE book and show how book loses prominence.
Use dialogue completion tasks where the student must decide which word to stress based on context.
Combine with intonation work — contrastive stress is inseparable from pitch movement.
Drama and role-play activities naturally elicit contrastive stress in ways that drilling cannot.