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. Author manuscript; available in PMC: 2009 Oct 26.
Published in final edited form as: Trends Cogn Sci. 2008 Jul 5;12(8):314–321. doi: 10.1016/j.tics.2008.04.008

Table 1.

Conflicts between measuresa

Content unconscious according to:
Objective Strategic control Subjective Wagering
Content conscious according to: Objective Unconscious knowledge by Jacoby’s process dissociation procedure is ipso facto conscious by objective measures (e.g. Refs [60,72]) In both subliminal perception and implicit learning, subjects often pass objective tasks while claiming to have no knowledge or showing no relation between confidence and accuracy (e.g. [22,7375]) Shown in blindsight and in the Iowa gambling task by [34]
Strategic control Not possible Subjects can control which grammar to employ while claiming to be guessing [32] and hypnotized subjects can engage in strategic control while reporting no awareness [76] Not yet shown but entirely possible (see below)
Subjective Not possible Shown in Stroop effects – a person can report the word’s meaning but cannot control its rapid use As yet only shown in our unpublished work – a person can report awareness but still wager indiscriminately
Wagering Not possible Not yet shown but entirely possible (see Box 2) Not yet shown but entirely possible (see Box 2)
Widespread activation Cognitive control system, including prefrontal cortex, activated by objectively invisible stimuli [56] Likely for Stroop with clearly shown words [44] Shown in a ‘relative blindsight’ paradigm [31] Likely given the results with verbal subjective measures, but not yet tested
Synchrony γ synchrony persists during non-REM sleep and under anaesthesia [53] As left As left, also, similar levels of γ synchrony are observed during non-REM and during (reportable) REM sleep [52] As left
Complexity measures Possible in theory (but see Φ). Not tested in practice As left As left As left

Content unconscious according to:
Widespread activation Synchrony Complexity measures

Content conscious according to: Objective Local neuronal activity can support discriminatory behaviour in many non-conscious organisms (e.g. nematodes and worms). In humans, at least sensory and motor cortices need to be active Unlikely given current evidence Not yet tested but entirely possible
Strategic control Unlikely: strategic control probably requires activation in both perceptual and frontal regions As above Possible but not tested
Subjective As above As above As above
Wagering As above As above As above
Widespread activation Experimentally open. Some studies show increased long-range synchrony accompanying conscious access [48] Possible in theory. Not tested in practice
Synchrony Gamma synchrony is often localized [47] As above
Complexity measures High neural complexity (or Φ, or cd) probably requires widespread activity: all else being equal, larger networks will give rise to higher complexity values [17] Possible in theory. Not tested in practice
a

Rows indicate a measure finds the content conscious and columns indicate the measure finds the content unconscious. Entries reflect a scale according to which a particular conflict is (i) experimentally noted, (ii) not yet shown but entirely possible, (iii) experimentally open, (iv) possible but not tested, (v) unlikely given current evidence and/or theory, or (vi) not possible.