In Maier, S. F., & Seligman, M. E. P. (2016), Learned Helplessness at Fifty: Insights from Neuroscience, the authors quote an objection of Richard Herrnstein, a prominent Harvard Skinnerian (emphasis theirs):
You are proposing that animals learn that responding is ineffective. Animals learn responses; they don't learn that anything.
What does this sentence mean? I'm not sure what the emphases on the
thats try to convey. I'm not even sure if the phrase
they don't learn that anything is grammatical.
Note: I ask this question here instead in ELL or ELU because it requires the answerers to have a decent understanding in psychology, in particularly behaviorism.