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Neuroscience: Exploring the Brain 4th Edition

Neuroscience: Exploring the Brain (4th Edition)

Book Edition4th Edition
Author(s)Bear, Connors
PublisherWolters Kluwer

Chapter 21, End of Chapter, Review Questions, Exercise 1

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Even in the resting state-certain regions of the brain are active. One of the functions of the active state of the default mode network is to maintain vigilance to protect oneself from danger. The activation of the brain is considered in the asleep condition of the brain which can be explained by the sentinel hypothesis.

The involvement of the peripheral vision increases the active task, as the resting state diffusely monitors our broad visual field.

In a resting stage, the area of the visual field is increased compared to a focussed state in which the visual field is on a target. Interoception of the organs such as the beating of the heart, imagination, autobiographical memory that involves collective analysis of the visual information, recollection of episodes in the past, and understanding of one-self. Damage to the default mode network affects the thinking, and interpretation of the person in relation to the above activities.

Verified Answer

The medial prefrontal cortex, posterior cingulate cortex, posterior parietal cortex, hippocampus, and lateral temporal cortex are active even during the resting state. 


  • Medial prefrontal cortex: This region is located in the frontal lobe. This region is involved in normal sleep and dreaming. Deprivation of sleep is found to be associated with the area.
  • Posterior cingulate cortex: This region is mainly involved in recollecting past events, or daydreaming and imagining situations in the future. This generally happens when the brain is idle. It also is involved in the functioning of the visual field.
  • Posterior parietal cortex: It plays an important role in visual attention. It is also involved in attentiveness. Hence, even when the brain is resting, the posterior parietal cortex helps in maintaining the attention of the surrounding.
  • Hippocampus: This region is located in the temporal lobe. This region is involved in memory-related tasks during the resting stage.
  • Lateral temporal cortex: This region is located in the temporal lobe, and plays an important role in visual coding especially during the resting stage. 
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