GNWT

Question 1

Global Neural Workspace Theory

Answer 1

Distinguishes three modes of proessing a stimulus may undergo

1. Subliminal
   - T3, weak strength and not very deep in the cortex
2. Preconscious
   - T2, stronger and deeper activation, but bc of absence of attention it doesn’t reach the global workspace
3. Conscious
   - T1, high strength and attention, deep activation and reaches global workspace. Can broadcast to other modules

Question 2

Reverbarating activation

Answer 2

Once info reaches the GW, it gets amplified through reverberating activation. The stimulus doesn’t die out as quickly and creates global ignition.

Manifests itself typically at about 300-400 ms after stimulus onset

Question 3

Conscious access

Answer 3

Broadcasting into GW and subsequent global ignition produces conscious access. Allowing you to report the stimulus

Possible through long axons in the FC, creating a hub to broadcast

Question 4

Support

Answer 4

Paradigms that contrast neural signals for stimuli that are reported as seen vs stimuli reported as not seen. Eg in the attentional blink paradigm.

All or nothing concepts, either see it or not.

Occipital signals like P1 do not correlate w seen or not seen.
- P1 and N1 are always there.
- The lower the visibility the lower the N2,
- the N3, N4 and P3a/P3b (!) gives the all or nothing depending on if its seen.

So: frontal activity is the neural correlate of what subjects report seeing