11 Consciousness Flashcards
1
Q
hemineglect
A
- no conscious perception of one visual hemifield
- caused by parietal or frontal lesion
2
Q
subjective vs. objective threshold
A
subjective: Did you see something or not? based on reports, detection
- objective: Did you see this or that? based on partial information, discrimination
- subjective threshold is always higher than objective one
3
Q
subliminal vs. unnoticed
A
- subliminal: below threshold of consciousness
- unnoticed: perceived but effect unknown
4
Q
Microconsciousness (Zeki)
A
- selective activation in a brain module specialized for representing a given class of contents is sufficient for awareness of those contents
- evidence: prosopagnosia, achromatopsia
- criticism: FFA also shows some activity when seeing houses
5
Q
level-of-activity theory
A
- activity in specialized area has to reach certain threshold to create conscious experience
6
Q
higher stages of visual processing theory
A
- only 20% of neurons in V1/V2 modulate activity based on the percept
- higher proportion of modulating neurons in higher areas
- consciousness happens late?
- criticism: not the best way to analyze the data
7
Q
ventral vs. dorsal pathway theory
A
- temporal/ventral: object identity
- dorsal/parietal: spatial location
- perceptual orientation matching vs. visuomotor placing
- ventral stream is conscious, dorsal is unconscious
8
Q
recurrent processing
A
- Not only bottom-up but also top-down processing in the brain
- superposition of a lot of different signals
- if something is processed as a figure, its processing gets boosted later in the process
- bigger response when you see a figure compared to not seeing it
9
Q
global neuronal workspace theory
A
- after a critical amount of activity is reached, the signal is propagated into prefrontal/parietal cortex to trigger more complex processing and behavior
- global broadcasting
