Essential Learning
The Step-by-Step Guide to DTT from the National Professional Development Center on Autism Spectrum Disorders outlines how DTT steps progress over time.
In this lesson, we examined discrimination training. One approach used by some organisations is the Structured Mix Method. Below is an overview of the method, its criticisms, and best practices for RBTs implementing DTT.
The Structured Mix Method: Steps for Skill Acquisition
- Mass Trials of the First Target without Distractors: Teach the learner to select a specific object (e.g., dinosaur) with prompts as needed.
- Mass Trials of the First Target with Distractors: Add distractor items; reinforce correct selection of the target without touching distractors.
- Mass Trials of the Second Target: Teach a second target (e.g., car), typically contrasting with the first.
- Mass Trials of the Second Target with Distractors: Add distractors while teaching the second target.
- Block Rotation: Present both targets; request one item at a time until criteria are met, then switch.
- Random Rotation: Randomise requests and positions; learner must respond to varied verbal cues.
Criticisms
- Lack of Discrimination in Early Steps: Learners may respond based on repetition rather than attending to the verbal stimulus.
- Redundant Training Steps: Overly prescriptive sequences may lead to overtraining and reduced efficiency.
Best Practices for RBTs
- Individualise the approach to each learner’s needs.
- Regularly assess progress and adjust instruction.
- Systematically fade prompts to encourage independence.
- Foster generalisation across stimuli, contexts, and instructors.
When implemented flexibly, the Structured Mix Method can be a valuable framework for building listener discrimination skills.
Optional Resources
Optional Reading: Ferraioli, S., Hughes, C., & Smith, T. (2005) — A model for problem solving in DTT for children with autism.
Optional Videos:
Examples of DTT in practice across different skills:
- Receptive Letter Identification: Michelle Hogan
- Tacting Words: Capitol Autism Services
- Intraverbal Response: Eleutheria Center
- Listener Discrimination (Structured Mix): ABA Presentations
- Progressive Approach to DTT: Hacking ABA
Conversation Exercise
Use FRED, our AI-powered chatbot, to explore how you might adapt the Structured Mix Method or alternative discrimination training methods for a learner you work with.
Click the conversation icon in the bottom right of your screen, or open the chat interface directly.
If you have not already, read our guide on getting the most from your conversations with FRED.
Reflection Exercise
Before you start, have you read our article on completing reflection exercises?
Write a reflection using the prompts below. Your response should be:
- Between 100 to 500 words (5–7 sentences minimum)
- Written in any language you prefer
- Focused on deep engagement, not grammar or spelling
Reflection Prompts (choose one or more):
- Summarise Key Concepts: What are the main steps in the Structured Mix Method?
- Define in Your Own Words: How would you explain this approach to a colleague?
- Importance and Relationships: Why might some prefer this method over others, and how does it relate to generalisation?
- Practical Application: How could you adapt the method to suit a specific learner?
- Application to Your Practice: Give an example of when you might use or modify this method.
- Interesting Insights: Did the criticisms or best practice tips change your view of the method?
Example Reflection:
Reading about the Structured Mix Method helped me see its potential for building strong listener discrimination skills while also realising its limitations. I liked the clear progression of steps, but I now see the risk of overtraining if mastery criteria are too rigid. I think combining it with varied generalisation opportunities could help make it more engaging and effective…
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