Experimenters present stimuli very briefly under conditions where people sometimes perceive them consciously and sometimes not. How, if at all, do the brain responses differ?
A) When something is conscious, its representation spreads to much of the cortex.
B) When something is conscious, it evokes a release of pituitary hormones.
C) When something is conscious, it produces PGO waves.
D) Brain responses do not differ between conscious and unconscious items.

Question

Quizplus · Accepted Answer

Studies have shown that when a stimulus is consciously perceived, its representation spreads widely across the cortex, activating multiple brain regions involved in perception, attention, and memory.

Answer: D
 Some studies have shown that certain brain responses, such as sensory-evoked potentials or gamma-band oscillations, do not differ between conscious and unconscious stimuli. However, other studies have shown differences in brain activity related to the level of consciousness of the stimulus.

Experimenters Present Stimuli Very Briefly Under Conditions Where People Sometimes