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LIT-637: What Is Wrong with the No-Report Paradigm and How to Fix It

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StatusActive — read in full 2026-10-03 (NOTE-495); worth reading as the argument that removing report does not isolate the neural basis of conscious perception, because subjects, monkeys included, can still think about what they see ("the bored monkey problem"). What is needed is a paradigm with no post-perceptual cognition that differs between percepts. Brascamp et al.'s inconspicuous binocular rivalry, whose switches subjects could not tell from constant random changes, is offered as one, and found no prefrontal difference by fMRI. Block flags that fMRI may be too coarse, and that ECoG could still favour prefrontalism.
Tagsconsciousness, neuroscience, philosophy-of-science, cognition
ExtendsLIT-646 — Consciousness, accessibility, and the mesh between psychology and neuroscience
RivalsLIT-631 — Conscious Processing and the Global Neuronal Workspace Hypothesis
Cited as “paper” byNOTE-495 — What Is Wrong with the No-Report Paradigm and How to Fix It
Cited as “source” byTHEORY-094 — Neither report nor no-report paradigms isolate the neural basis of consciousness, because post-perceptual cognition that tracks the percept persists without report; only a design that removes differential post-perceptual cognition does, THEORY-098 — The neural basis of perceptual consciousness does not include the prefrontal machinery of cognitive access: it is recurrent activity in sensory cortex

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Ned Block (2019), Trends in Cognitive Sciences 23(12), 1003–1013, an Opinion article.

Key takeaways

  • Front versus back. Theories divide on whether perceptual consciousness requires prefrontal circuits for thought, reasoning, report and memory (global workspace, higher-order theory) or is based in sensory cortex (IIT, recurrent processing). Front versus back is a surrogate for whether consciousness is cognitive.
  • Transitions are not contents. Prefrontal correlates of switches in binocular rivalry could reflect attention, arousal, preconscious stages or motor control, not the percepts. If there is no prefrontal difference, contents cannot be prefrontal; if there is one, little follows.
  • The no-report paradigm and its flaw. Frässle et al. used optokinetic nystagmus to track rivalry without report and found prefrontal differences minor. But monkeys in no-report rivalry (Panagiotaropoulos’s group) showed prefrontal decoding of contents. Either way, “eliminating reports does not eliminate post-perceptual cognitive processes if the subjects are thinking and reasoning about the stimulus”: the bored monkey may muse on which way the grating moves.
  • A fix. Brascamp et al. 2015 made rivalry switches inconspicuous by using same-coloured dots whose motion changed randomly every 300 ms. Subjects could not tell rivalrous switches from the others (d′ for detection indistinguishable from chance), so no differential thought followed, and fMRI found prefrontal differences only for different- coloured dots. Block calls this a “no-differential-post-perceptual cognition” paradigm.
  • Rivalry is local (Box 2). Whether two eyes’ images rival or fuse is set by local features, not by high-level knowledge that a face is not a house, which tells against the predictive-processing explanation of rivalry (Hohwy et al.; Clark).

Standing in the record

Filed on 2026-10-03 at the owner’s request, with six other papers by Block on consciousness. No anthology topic holds the methodology of consciousness science, and the paper carries no instruction for machine-learning practice.

It extends Block (2007), LIT-646. It cites that paper as the source of the problem the no-report paradigm was meant to solve, separating the neural basis of consciousness from the basis of the cognition behind report, and argues that the paradigm solved it only in part.

Bearing on the new theories.

  • THEORY-102 (Vishne et al., LIT-644) found prefrontal content confined to about 150–600 ms after onset, with no report on analysed trials. This paper says that no-report trials do not exclude post- perceptual thought. On its argument the onset burst could be cognition about the image rather than part of seeing it, and the absence of sustained prefrontal content is the more informative result. That reading is mine. The theory’s promote_when already names the COGITATE adversarial collaboration, which this paper mentions as funded to settle front versus back.
  • THEORY-100 asks, for its “conscious” half, for a no-report or report-independent paradigm in birds. By this paper’s argument that would not be enough: a bird not asked to report may still process the percept cognitively, and NCL, the prefrontal analogue, is where that would show. The theory would need a no-post-perceptual-cognition design, such as inconspicuous rivalry.

No relation is declared to those works; this paper predates the Vishne et al. study and does not discuss birds. Brascamp et al. 2015, Frässle et al. 2014 and Safavi et al. 2014, on which the argument turns, are not held.

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