There are links between Hartmann's and Hobsons ideas where one writers point of view is supported by the other one, even though their approach and conclusions are very different.
Hartmann describes the working of the brain in terms of "nets of the mind" as a way for us to have a visual model of how the brain works. Physically, we have learned that the brain is made up a large network of neurons and synapes which communicate via electrical signals. The neurotransmitters which Hobson discusses, act on these networks to facilitate the communication. The level and activity of these neurotranmitters he argues are a major factor in affecting our dreams, and other "altered states of consciousness". Hartmann suggests that the "nets" are "connecting" or "cross-connecting" when we dream, which moves away from Hobson's more scientific explanations but what is similar is the idea that the physical brain is operating differently when we are asleep (Hartmann 78).
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"The Dream as a Revelation" was written by James Sully, a leading figure in child psychology in the late 19th Century. This essay brings up different aspects of dream theory. Freud, who came after, cites this essay in "Interpretation of Dreams" and from reading the essay I can definitely see links between Sully's ideas and Freud's writing.
Sully begins by pointing out that there are two extreme views of dreaming at that time - one where dreaming is seen as superior to waking in the way it provides more insight. The other is that dreaming is just "intellectual fooling". These may be the extremes but it is similar to the debate on dreaming we are still having now - are they a meaningful link to the subconcious, part of our mind, or just a by-product of a practical brain performing memory functions while sleeping.
He goes on to argue that the science at the time can reconcile this opposition. He is aware that there are physical differences in the brain activity while we sleep, which is what Hobson also tells us today. His physical explanations are not as accurate or as scientifically proven as Hobson are, over a century later, but Sully is trying to reconcile the physical and mental. He also calls the brain state while sleeping an "altered state" and compares it to hynotic trance and psychosis, which is similar to what we read in the Hartmann book.
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