Skinner's verbal behavior, Chomsky's review, and mentalism.

Stemmer (1990) wrote a theory paper. He asked: Can we explain how kids learn grammar with only Skinner’s ideas? No mind-talk, no hidden rules.

He looked at Chomsky’s attack on Skinner. Chomsky said grammar needs an inner language box. N said the box is not needed. All grammar can be built with reinforcement, echoics, and intraverbals.

The paper found that every grammar move can be framed as a learned operant. Kids copy adults (echoics). They get praise for right word order (reinforcement). New sentences grow like chains, not from a brain rulebook.

No mental plans are required. The same tools that teach a pigeon to peck can teach a child to speak in full sentences.

Palya (1985) gave pigeons tiny verbal jobs. Birds learned tacts, mands, even intraverbals. That animal test backs N’s claim: verbal pieces work without mind talk.

Neuman (2004) went further. He showed how to keep the word “intention” in our mouth while still kicking mentalism out the door. Use it only when you can point to the public cues that make us say “he meant to.”

Critchfield (2018) updates the story. He says teach stimulus-relations in grad school. One trained relation blooms into ten new grammar forms. Same anti-mental stance, faster teaching.

If grammar is just operant chains, your therapy can build it piece by piece. Echoic drills, intraverbal fill-ins, and reinforcement of novel combos are enough. Skip the worksheets about invisible rules. You save time and stay inside pure behavior analysis.