Table 1.
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. [22,73–75]) | 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in Stroop effects – a person can report the word’s meaning but cannot control its rapid use | As yet only shown in our unpublished work – a person can report awareness but still wager indiscriminately | ||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 |
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.