Brain network mapping

Question 1

Mesulam’s model

Answer 1

Earliest. Frontal component, parietal component and limbic component with reticular formation as arousal regulator

Question 2

Posner and Petersen’s model

Answer 2

Based on PET. Proposes an anterior and posterior attentional system.
- Alerting system: frontal and parietal (right mostly), distribution of norepinephrine
- Orienting system; Superior parietal region, TPJ, frontal region and superior colliculi/pulvinar. controlled by acetylcholine
- Executive system: Anterior cingulate and lateral prefrontal. Dopaminergic activity

Question 3

Corbetta and Shulman’s model

Answer 3

Two systems;

• First system; Intraparietal cortex and superior frontal cortex. Controls on relevant stimuli and repsonses based on goals. Endogenous control
• second system; TPJ and ventral frontal cortex (mostly right). Detecting relevant stimuli when salient and unexpected. Exogenous

Question 4

Generality of attentional control system

Answer 4

It invokes the same brain areas in many tasks