Constraint-induced language therapy (CILT)

Constraint-induced language therapy (CILT) - also called constraint-induced aphasia therapy (CIAT) - borrows an idea from constraint-induced movement therapy: gently force the affected system to work. Here, that means communicating with words in a game-like practice, rather than falling back on gestures, drawing, or pointing.

What it looks like

• Intensive: several hours a day over one to two weeks.
• Spoken output only: a barrier or rule encourages words over gestures.
• Shaped difficulty: tasks are tuned to be challenging but achievable.

What the evidence says

• An early controlled study found that massed, constraint-based practice improved language in chronic aphasia compared with conventional, less intensive therapy ^{[Pulvermuller F 2001]} .
• A meta-analysis of randomised trials concluded CILT can improve language outcomes, broadly comparable to equally intensive conventional therapy - so intensity and practice may matter as much as the “constraint” itself ^{[Zhang J 2017]} , a point echoed by later reviews ^{[Ng S 2022]} .

This sits inside the bigger, well-supported finding that speech and language therapy improves communication after stroke ^{[Brady MC 2016]} .

The honest takeaway

• CILT is a legitimate, evidence-based option - especially for people who can manage intensive practice.
• The intensity is demanding; it is not right for everyone, and gains still need to be carried into real conversation.
• “Constraint” is a tool, not a rule to enforce harshly - the goal is confident communication, using every channel in daily life.

How this site helps

Short, spoken-response activities in Practice give bite-sized word practice you can do daily. Explore the Speech & language therapy hub for more.

Remember: this is general education, not medical advice. Your clinician knows your situation best.