ABA Fundamentals

Matching to complex samples and stimulus class formation in adults with autism and young children.

Maguire et al. (1994) · Journal of autism and developmental disorders 1994
★ The Verdict

Adults with autism can build 3- to 4-member stimulus classes when training emphasizes multiple sample elements.

✓ Read this if BCBAs teaching conditional discrimination to teens or adults with autism.
✗ Skip if BCBAs working only on basic mand training with preschoolers.

01Research in Context

01

What this study did

Researchers worked with four adults who had autism.

They used matching-to-complex-sample tasks.

Each trial showed a sample picture made of many parts.

The adults had to pick the comparison picture that matched all parts.

Training went on until they could match new sets without errors.

Then the team tested if the adults linked all pictures into one class.

02

What they found

All four adults built 3- and 4-member stimulus classes.

They could match pictures they had never seen together before.

This shows adults with autism can learn to group items by shared features.

The key was training them to watch many parts at once.

03

How this fits with other research

Poling et al. (1977) first showed pigeons can do this with lights and colors.

Allan et al. (1994) proved the same idea works for adults with autism.

Bell (1999) later showed a chimp could do it too, but needed quick reversals.

Clements et al. (2021) took it further with kids.

They used matrix training and got 8-12 new skills for each one taught.

Curiel et al. (2020) used the same matrix idea to teach clock times.

These newer studies show the method keeps working across ages and topics.

04

Why it matters

You can teach broad concepts faster by adding many features to each sample.

Instead of teaching every single match, train with rich samples.

Your learner will form classes and generalize on their own.

This saves hours of direct teaching time.

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Add at least three clear features to your next matching-to-sample trial, like color, shape, and size together.

02At a glance

Intervention
stimulus equivalence training
Design
single case other
Population
autism spectrum disorder
Finding
positive

03Original abstract

Adults with autism and young children first learned to match one-element comparison stimuli to two-element sample stimuli. Test conditions then examined whether each of the individual sample elements (a) controlled selections of the comparison stimuli to which they were related during training, (b) were interchangeable with one another as either sample or comparison stimuli, and (c) were interchangeable with the original comparison stimuli. Test data were positive and suggested the formation of three-member stimulus classes. Subsequent experiments demonstrated the formation of four-member classes by (a) adding novel stimuli by training outside the original context; (b) adding novel stimulus elements to the two-element samples used during baseline training; and (c) training with three-element rather than two-element sample stimuli from the outset. Results suggest that acquisition of stimulus classes may be one of the benefits of broad rather than restricted attention to the components of complex stimuli.

Journal of autism and developmental disorders, 1994 · doi:10.1007/BF02172284