Disentangling perceptual awareness from nonconscious processing in rhesus monkeys (Macaca mulatta) — TEI-tagged view

Ben-Haim, Dal Monte, Fagan, Dunham, Hassin, Chang, Santos · 2021 · psychology · doi:10.1073/pnas.2017543118 · full text at the source · TEI xml · tagged edition · index · concepts · authors
Where this record's text came from. faceted 2026-08 by reading the locally held text (html); every evidence string verified as an exact substring of that text before merging. Claim relations is deliberately EMPTY: this PNAS article uses numeric citations throughout, so although it positions itself against prior work ('To date, no one has explored if similar performance dissociations exist in a nonhuman species.'), no prior study is named in the article text and recording a target would require importing knowledge from outside the paper (rules 2 and 7). Replication status = replicated on the strength of the paper's own statement that Experiments 3 and 4 replicate Experiments 1 and 2 in a different paradigm; this is internal replication, not external. Overall claim is also anchored by: 'Taken together, these results strongly support the existence of both nonconscious processing as well as functional human-like visual awareness in nonhuman animals.' 2026-08-12 and 2026-08-15 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
4 quotations on this page contain a reference number where the paper printed a superscript. This journal style prints citations as raised numerals — parameters12,13 — and the extraction flattened them into the line, so the sentence reads parameters 12 , 13 . The digits are citation markers and not part of what the author wrote. The quotes keep them for the same reason they keep every other extraction fault: a quote is reproduced exactly or it proves nothing.
Other fields define these differently the same word, defined another way in another discipline
statistical-significance 2 fields · theory of mind 2 fields
Tags on this paper every tag the record carries, whether or not the words occur in the text below — a number is how many papers in the corpus carry that tag; a tag with no number is unique to this paper
double dissociation4 single dissociations subliminal5 supraliminal2 nonconscious processing visual awareness3 spatial-cueing paradigm explanatory gap theory of mind4 behavioural-experiment117

Our tag layer for this paper

Cross-disciplinary analysis
content-tags & facets: phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text
phenomenondouble dissociation of visual awareness in nonhuman primates— “We harnessed a well-established cross-over double dissociation between nonconscious and conscious processing, in which people perform in completely opposite ways when they are aware of stimuli versus when they are not.”
claim-typeexistence— “These results provide robust evidence for two distinct modes of processing in nonhuman primates.”
method — evidence— “In a series of seven experiments, we first established these signatures in humans using both known and newly developed nonverbal double-dissociation tasks and then identified similar signatures in rhesus monkeys ( Macaca mulatta).”
object of study — evidence— “To examine nonconscious influence in monkeys, we adopted a spatial-cueing paradigm ( 37 – 40 ).”
research question — evidence— “Since nonverbal species cannot report their internal states, philosophers and scientists have long debated whether the question of animal consciousness is empirically testable, and it still remains a topic of speculation ( 1 , 2 ).”
contribution — evidence— “Because this approach predicts that completely opposite signatures of performance would emerge only if there were both conscious and nonconscious processing modes, this framework can be used to reliably disentangle the two levels of processing in a nonhuman animal.”
transferfrom human cognitive science / experimental consciousness research on humans: They take the cross-over double-dissociation marker of nonconscious processing, developed and validated only in verbal human subjects, and transplant it into nonhuman-primate comparative research as a nonverbal test for awareness— “Critically, by importing one of the strictest indicators of genuine nonconscious processing in human studies”transfers[0]
transferfrom human cognitive science: the cross-over double dissociation of visual awareness, rebuilt as a nonverbal saccade task so that it can be run on a species that cannot be asked what it saw— “Much work in human cognitive science has shown that under certain circumstances, people display opposite behavioral signatures when they are consciously aware of stimuli (i.e., when they are exposed to clearly visible stimuli—supraliminal stimuli) versus when they are not aware (i.e., when they are exposed to stimuli that are flashed for a…transfers[1]
mechanismSubliminal cues capture gaze toward the cued (wrong) side and, without awareness, the subject cannot disengage before target onset, so the eyes are still at the wrong location when the target appears and the response is slowed— “subjects still failed to move their gaze to the target location ahead of time and maintained their gaze at the cue location during the final 100 ms prior to the target appearance”mechanisms[0]
mechanismConscious access to the cue lets the subject deploy a deliberate strategy that redirects gaze to the opposite location before the target appears, converting the same cue from interference into facilitation— “suggesting again that a conscious strategy was necessary in order for participants to redirect their gaze to the relevant location.”mechanisms[1]
mechanismBecause the two conditions push performance in opposite directions, the cross-over pattern itself is what separates aware from unaware processing in a nonverbal subject— “Since these opposite patterns of performance are predicted to emerge only if animals are aware in one condition (presenting functional facilitation) but unaware in the other (presenting persistent interference), they allow us to successfully disentangle the two types of processing in nonhuman species.”mechanisms[2]
mechanisma subliminal cue cannot be disengaged from, so it drags attention the wrong way; a supraliminal one can be reasoned about, so it helps - the two pull in opposite directions— “Researchers have argued that this phenomenon stems from the difficulty of disregarding a stimulus that is nonconsciously processed ( 33 , 34 ).”mechanisms[3]
mechanismthe design's force comes from predicting the REVERSE of what salience alone would predict, so a confound cannot produce the result— “our predictions for implicating visual awareness and nonconscious processing are predicted in the reverse direction of what would typically be expected when inhibiting salient versus nonsalient incongruent stimuli”mechanisms[4]
mechanismonly two processing modes can produce two opposite signatures, so the crossing itself is the inference - not either half of it— “Because this approach predicts that completely opposite signatures of performance would emerge only if there were both conscious and nonconscious processing modes, this framework can be used to reliably disentangle the two levels of processing in a nonhuman animal.”mechanisms[5]
extends the single-dissociation literature on animal awareness (blindsight analogues, implicit/explicit memory, binocular rivalry)— “All these important single dissociations of awareness exploration convincingly show that animals display properties similar to those seen in conscious or nonconscious processes.”claim_relations[0]
contradicts the position that consciousness requires language or a human-like theory of mind— “some advocate that consciousness may require complex processes like language, which is unique to adult humans ( 3 ) or a human-like theory of mind ( 4 )”claim_relations[1]
builds-on the spatial-cueing paradigm ( 37 - 40 )— “To examine nonconscious influence in monkeys, we adopted a spatial-cueing paradigm ( 37 – 40 ).”claim_relations[2]
senseawareness - the reportable kind, defined operationally by what a subject says it saw and by a forced-choice test at chance— “Participants’ performance did not differ from chance at the individual binomial level or at the group level”senses[0]
senseawareness - the behavioural kind, defined by a crossing of two opposite performance signatures and requiring no report at all— “Because this approach predicts that completely opposite signatures of performance would emerge only if there were both conscious and nonconscious processing modes, this framework can be used to reliably disentangle the two levels of processing in a nonhuman animal.”senses[1]
senseconsciousness - the demanding sense requiring language or theory of mind, which would confine it to humans and a few great apes— “some advocate that consciousness may require complex processes like language, which is unique to adult humans ( 3 ) or a human-like theory of mind ( 4 )”senses[2]
senseconsciousness - the neuroanatomical sense, on which birds and octopuses may qualify— “In contrast, based on neuroanatomical similarities, some argue that a number of species (including some birds and octopuses) are likely to be capable of generating conscious experience ( 7 ).”senses[3]
controltwo NONPREDICTIVE cues, presented in both the supraliminal and the subliminal conditions — held— “Thus, the participants in this control condition could not use the spatial cues to predict the target location” — rules out the mere presence of a cue as the explanation - if performance improved whenever any cue appeared, the effect would be arousal or alerting rather than the spatial information the cue carries— “As a control, we also presented two nonpredictive cues, both in the supraliminal and subliminal conditions.”controls[0]
auditvisual awareness —operationalised-as→ double dissociation — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the double-dissociation framework is USED TO disentangle conscious from nonconscious processing; operationalised-as is loose.— “Because this approach predicts that completely opposite signatures of performance would emerge only if there were both…concept_edges[0]
edgesubliminal —contrasted-with→ supraliminalconcept_edges[1]
auditvisual awareness —distinct-from→ nonconscious processing — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'conscious' and 'nonconscious processing' / 'aware', not 'visual awareness'.
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concept_edges[2]
auditnonconscious processing —operationalised-as→ subliminal — Audit 2026-09-28: DOUBTFUL - read against its span and kept, but subliminal cueing is the method for nonconscious processing; operationalised-as is loose.
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concept_edges[3]
outcomecontrol — held
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controls[0]
replicationreplicated
limitationAwareness in monkeys could not be probed verbally, so the inference rests on the behavioural pattern alone.
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limitations[0]
limitationNo subjective reports were collected from the monkeys; the subliminal thresholds were imported from the human procedure.
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limitations[1]
limitationThe nonconscious effect may arise from low-level attentional orienting or residual visual traces rather than from a richer nonconscious process.
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limitations[2]
limitationThe inference rests on a behavioural signature, not on any access to experience - the explanatory gap the paper cites is not closed by it.
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limitations[3]
limitationAwareness of the subliminal cue is established by self-report and a forced-choice test, both of which are null results rather than proof of absence.
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limitations[4]
limitationThe whole approach assumes the human dissociation transfers to another species; before this paper there was no evidence it does.
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limitations[5]
Content tags
content-observations: finding · quantity · variable · definition · key-term — grounded in the full text
findingSubliminal incongruent cues slowed human target detection relative to baseline even though participants reported and tested as unaware of them, establishing nonconscious processing.
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content_tags.findings[0]
findingRhesus monkeys in the subliminal condition were significantly slower to detect the target than in the baseline with two nonpredictive subliminal cues.
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content_tags.findings[1]
findingLike the human participants, the monkeys failed to ignore the subliminal cues and showed no signs of learning.
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content_tags.findings[2]
findingSupraliminal-condition participants who reported no awareness of the cue's predictive value were not faster than baseline (324 ms against 312 ms).
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content_tags.findings[3]
findingCue awareness, not cue saliency (the cue stayed hard to see at 33 ms), appears to be the critical factor in performance.
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content_tags.findings[4]
findingPerformance stayed significantly below chance on trials where participants reported no awareness of the cue's location.
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content_tags.findings[5]
findingRhesus monkeys show a double-dissociation pattern remarkably similar to that of humans.
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content_tags.findings[6]
findingHumans are much faster with a visible incongruent cue than with an invisible one - the conscious condition helps.
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content_tags.findings[7]
findingThe same cue presented invisibly does the opposite: participants who saw nothing were nevertheless slowed relative to baseline.
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content_tags.findings[8]
findingThe double-dissociation signatures were first established in humans across seven experiments and then found in similar form in rhesus monkeys.
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content_tags.findings[9]
findingEarlier work established only single dissociations, which show animals have properties resembling conscious or nonconscious processing without separating the two.
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content_tags.findings[10]
quantitymean = 43.5% correct, P = 0.00018 — Monkeys' below-chance accuracy in the subliminal forced-guessing condition and its combined binomial probability
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content_tags.quantities[0]
quantity42% versus 25% — Share of human participants falling in the lowest binomial p-value quartile versus the share expected by chance
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content_tags.quantities[1]
quantity94.6% correct, SD = 3.7% — Human accuracy in the supraliminal forced-guessing condition (eye-tracking modality)
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content_tags.quantities[2]
quantity4 monkeys, 145 humans — Total subjects across the seven experiments
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content_tags.quantities[3]
quantity75% — Participants who became aware of the cues and used them when only 20% of trials carried a supraliminal cue
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content_tags.quantities[4]
quantity250 ms versus 17/33 ms — Cue exposure durations defining the supraliminal and subliminal conditions
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content_tags.quantities[5]
quantity1.2% — Human error rate, which did not differ between supraliminal and subliminal conditions
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content_tags.quantities[6]
quantity50% — Chance level in the forced-guessing task, above which performance requires using the incongruent cue
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content_tags.quantities[7]
quantity250 ms vs 17/33 ms — supraliminal versus subliminal cue durations - the manipulation the whole design turns on
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content_tags.quantities[8]
quantityseven experiments — size of the series, humans then monkeys
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content_tags.quantities[9]
quantity200 ms fixation — gaze hold required to register a response, the nonverbal substitute for a button press
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content_tags.quantities[10]
variableresponse time (dependent)
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content_tags.variables[2]
variablegaze frequency (dependent)
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content_tags.variables[4]
definitionspatial-cueing paradigm
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content_tags.definitions[2]
definitionforced-guessing paradigm
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content_tags.definitions[3]
definitioncross-over double dissociation
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content_tags.definitions[6]
definitionsupraliminal stimuli
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content_tags.definitions[8]
definitionsubliminal stimuli
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content_tags.definitions[9]
key-termsdouble dissociation, subliminal, supraliminal, visual awareness, nonconscious processing, spatial-cueing paradigm, explanatory gap, single dissociations, theory of mind, rhesus monkeys
Concepts
terms this paper carries, each with the sentence it was cut from — the layer that joins one paper to another. Terms with no quote yet are on CONCEPTS.html.
conceptdouble dissociation — not defined in this paper's own words; a design in which two conditions produce opposite effects, so that the crossing itself - not either half - licenses the inference of two underlying processes
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concepts[0]
conceptsingle dissociations — not defined in this paper's own words; the weaker design used in earlier animal work: one effect consistent with a process, which cannot separate the two processes
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concepts[1]
conceptsubliminal — not defined in this paper's own words; presented too briefly to be consciously detected - here 17 or 33 ms, then masked
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concepts[2]
conceptsupraliminal — not defined in this paper's own words; presented long enough to be consciously seen - here 250 ms
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concepts[3]
conceptnonconscious processing — not defined in this paper's own words; processing of a stimulus the subject cannot report and cannot disregard
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concepts[4]
conceptvisual awareness — not defined in this paper's own words; the mode in which a stimulus is consciously accessible and can be reasoned about strategically
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concepts[5]
conceptspatial-cueing paradigm — not defined in this paper's own words; a task in which a cue precedes a target in the opposite location, and the response is a saccade
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concepts[6]
conceptexplanatory gap — not defined in this paper's own words; the distance between behavioural evidence and any claim about experience, which this literature treats as unclosed
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concepts[7]
concepttheory of mind — not defined in this paper's own words; invoked by one camp as a prerequisite for consciousness, restricting it to humans and a few apes
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concepts[8]
Statistics — cross-field join keys
field-invariant statistical terms, used in their statistical sense (gated on a number / symbol / test). A p-value or a standard deviation means the SAME thing in physics, biology, psychology and sociology — so these are the strongest cross-field join keys. Grounded verbatim.
linear mixed model as written: linear mixed models
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content_tags.statistics[0]
F-test F as written: F (1,3585) = 315.66, P < 0.0001
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content_tags.statistics[1]
correlation r as written: r = −0.86, P < 0.001
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content_tags.statistics[2]
binomial test P as written: individuals’ binomial test’s P values
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content_tags.statistics[3]
chi-squared test χ as written: χ (1) = 5.33, P = 0.021
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content_tags.statistics[4]
chi-squared test χ as written: χ (3) = 16.67, P < 0.001
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content_tags.statistics[5]
standard error of the mean SEM as written: SEM of monkey trials
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content_tags.statistics[6]
mean and standard deviation SD as written: mean= 94.6% correct, SD = 3.7%
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content_tags.statistics[7]
learning-slope correlation r as written: flat learning slope, mean r(383) = 0.005, P = 0.92
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content_tags.statistics[8]
anova F
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content_tags.statistics[9]
statistical-significance P
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content_tags.statistics[10]
binomial-test binomial
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content_tags.statistics[11]
Second readings
a facet read a second time, independently, from its own sentence — and whether the two readings agree
claim typeexistence — a second reading reaching the same value; recorded: existence
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alternatives.claim_type
phenomenoncross-over double dissociation between conscious and nonconscious visual processing — a second reading DIFFERING from the recorded value; recorded: double dissociation of visual awareness in nonhuman primates
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alternatives.phenomenon

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