Ned Block (2024), “Précis of The Border between Seeing and Thinking”, Philosophy and Phenomenological Research 110(1), 2025, pp. 273–283, online 18 December 2024 — DOI-10.1111/phpr.13126.
Key takeaways
- The thesis (p. 273). “Perception is constitutively iconic, non-conceptual and non-propositional while cognition is paradigmatically (but not constitutively) discursive (non-iconic), conceptual and propositional.” Cognition can use perceptual material “in a cognitive envelope”, as in reasoning with imagery. Block also accepts “a moderate level of modularity of perception”.
- The book’s route (pp. 273–274), as the précis lists it: armchair and scientific indicators of perception (adaptation, speed, pop-out, illusory contours); low- versus high-level perception; infant colour perception as nonconceptual; core cognition as “a mongrel notion” to be split between perception and cognition; perception studied irrespective of consciousness, against cognitive theories of consciousness, which Block now takes “more seriously” in their “pointer” versions.
- The cognitive envelope (pp. 274–275). The global neuronal workspace, “often offered as a theory of consciousness”, is “better thought of as a theory of how perceptual representations are conceptualized”. Broadcasting in the workspace is “the main mechanism of ‘working memory’”, and its use in reasoning makes the represented content “in part discursive, conceptual and propositional”.
- Working memory is not held perception (pp. 276–279). Nine differences: resistance to masking; recoding outside visual cortex; bias toward colour category centres; dependence on colour vocabulary; coarse grain; no divisive normalisation (Bloem et al. 2018); no iconic-memory partial-report effect across saccades; different decay (“sudden death”); task-dependent transformation (Kwak & Curtis 2022). Duan and Curtis (2024): V1 working-memory codes are “abstractions of percepts”. So “even the most basic perceptions … are recoded when used in substantial reasoning”.
- Iconic format (pp. 279–281). Block relies on a Shepard-derived notion: families of representations track degrees of environmental difference, change what they represent by degree, and mirror relations among the represented properties. Infant parallel-individuation and entropy-matching results show iconic representation in thought too, but within a cognitive envelope.
Standing in the record
Filed on 2026-10-03 at the owner’s request, in place of the book (LIT-636, a Deferred seed), under the record’s practice of reading a shorter lawful work by the author that states the same thesis. It states the thesis and the book’s plan in Block’s words. It does not carry the book’s arguments for the thesis (adaptation as a mark of perception, the infant colour argument, the neural evidence for nonconceptual perception), which remain unread here.
cognition primary, for the architecture of perception and thought;
neuroscience for the working-memory and decoding evidence; consciousness
for the reading of the global workspace. No anthology topic holds it, and it
carries no instruction for machine-learning practice.
Where it bears.
- Ivy & Mroczko-Wąsowicz (LIT-099, NOTE-150) side “with Green (2020) and Block (2023), who keep a perception/cognition border without committing to penetration”. The précis confirms Block keeps a border defined by format, not by encapsulation alone. NOTE-150’s “Block (2023)” is very probably the book (LIT-636); Ivy’s reference list was not checked.
- Sustained perception and prefrontal content (THEORY-102). That account finds content carried in ventral temporal cortex for as long as an image stays on, while prefrontal and parietal content is an onset event. On Block’s reading the prefrontal ignition is not where the percept lives but where it is conceptualised, so the account’s finding is what the cognitive-envelope view would predict for a task without report. That reading is mine; the précis does not discuss the study.
- Report without laminar cortex (THEORY-100). The crow nidopallium caudolaterale is the prefrontal analogue that carries report. On Block’s view such a region is a candidate for the envelope that conceptualises a percept for report, which is why that account’s own promotion test asks for a no-report paradigm. No more is claimed.
- Consciousness readings. Block’s consciousness papers, filed separately, are where the “pointer” versions of cognitive theories and the critique of prefrontal decoding are argued.