arXiv — NLP / Computation & Language · · 3 min read

Fodor and Pylyshyn's Systematicity Challenge Still Stands

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Computer Science > Computation and Language

arXiv:2606.14512 (cs)
[Submitted on 12 Jun 2026]

Title:Fodor and Pylyshyn's Systematicity Challenge Still Stands

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Abstract:The recent successes of neural networks producing human-like language have caused significant stir in cognitive science, with many researchers arguing that classical puzzles about human cognition and challenges to artificial intelligence are being solved by neural networks. A notable case is the argument from systematicity due to Jerry Fodor and Zenon Pylyshyn, argues that humans display systematic biconditional dependencies. For example, someone can understand the sentence "John saw Mary" just in case that they understand the sentence "Mary saw John." Symbolic systems explain this systematicity of language and thought, while neural networks offer no immediate explanation. Several recent articles argue that this challenge has now been met by neural networks. In particular, Brenden Lake and Marco Baroni argue that their meta-learning for compositionality protocol matches and perhaps explains human systematicity. We demonstrate that these conclusions are premature. Among other results, we found that their model struggles to learn rules that are even slightly out of distribution compared to their training data. Furthermore, the model behaves unsystematically even on many within-distribution problems. We conclude that Fodor and Pylyshyn's challenge to neural networks remains unmet.
Comments: Accepted in the Transactions of the Association for Computational Linguistics (TACL). This is a pre-MIT Press publication version of the paper
Subjects: Computation and Language (cs.CL); Artificial Intelligence (cs.AI)
Cite as: arXiv:2606.14512 [cs.CL]
  (or arXiv:2606.14512v1 [cs.CL] for this version)
  https://doi.org/10.48550/arXiv.2606.14512
arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Michael Goodale [view email]
[v1] Fri, 12 Jun 2026 14:42:36 UTC (75 KB)
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