Lesson 14
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Lesson 14 Presentation Transcript

  • 1. Lesson 14: Revision - getting ready for the mid semester study breakFriday, 30 March 2012
  • 2. Practice exam question Complete the following tableFriday, 30 March 2012
  • 3. Today’s Lesson• Explain the role of the reticular activating system in selective attention andwakefulness; role of the thalamus in directing attention and switching sensory input onand off• Understand what you need to do over the mid semester breakFriday, 30 March 2012
  • 4. The Reticular Activating System Video is on the wikiFriday, 30 March 2012
  • 5. The reticular activating system Is a network of neurons extending in many directions from the reticular formation in the brainstem to different parts of the brain and spinal cord Functions include: • Arousal, e.g. regulates by increasing or decreasing • Alertness, e.g. regulates wakefulness and attention • Selective attention, e.g. regulates what we choose to attend to, directs specific cortical areas to focus on relevant information Evidence for these functions includes: • Destroying the RAS causes a coma resembling sleep • Electrical stimulation of RAS instantly awakens sleeping animalsFriday, 30 March 2012
  • 6. Thalamus Is a small structure on the top of the brain stem that filters and relays incoming sensory information (except smell) to relevant cortical areas. Information moves from cortical areas to lower brain structures, the spinal cord and out to the peripheral nervous system. Function: • Plays a role in attention by actively filtering incoming sensory information, giving more weight to and emphasising certain information. • Regulates arousal through connection with the RAs. • Closes pathways of incoming information during sleep, preventing information from reaching the brain as it restsFriday, 30 March 2012
  • 7. 1. Explain the role of the reticular activating system inhumans?2.Verie Sleapi is lying on the couch watching television. Sheis feeling quite relaxed and nodding off. If you were toexamine her reticular activating system, what would youfind.3. Outline the relationship between the reticular activatingsystem and the thalamusFriday, 30 March 2012
  • 8. Answers 1. The RAS regulates levels of attention, sleep and consciousness.2. There would be a decreased blood flow in the RAS because there is a lower level of activity by the neurons of the RAS. There would be less activation of neurons. 3. The RAS controls attention and sleep and the thalamus controls attention to stimuli. Both relate to attention.Friday, 30 March 2012
  • 9. The next SAC.... the timelineFirst Week Back First Lesson Back: The practice SAC - Prepare like it is the real SAC. Second Lesson Back: Learning from your mistakes Second WeekSAC - Poster Start new topic - MemoryFriday, 30 March 2012
  • 10. What to do in the holidays Create digital resource for the class - see wiki for info Revise for the SAC Get ahead with the summaries - Everyone should be at least 1 week ahead when you get back from holidays Revise for the exam - Start your exam preparation now. You should revise everything we have done this termFriday, 30 March 2012