Surely the phenomena of consciousness is one of the most intractable problems in the universe. Legions of very bright people have taken a stab at the problem, to little or no avail. Sadly, I am unable to resist the temptation to read yet another discussion on the subject, even though I know I will come away frustrated.
My reservations notwithstanding, this book turned out to contain some genuinely interesting, as well as sensible, thinking on the operation of the human brain. His theory is well grounded in common sense, and is developed carefully. Humphrey's approach is a good one: How might the human brain have evolved to create consciousness from primitive antecedents?
Central to Hamphrey's theory is the distinction between sensation and perception, that is to say the difference between the subjective sensations that we experience versus the awareness of some external object. This argument takes a considerable length of time for Humphrey to unpack, and there were moments where I doubted that the distinction was worth the care that Humphrey lavished upon it. However, at the end of the day, it is worth wading through this discussion in order to fully understand this key element of Humphrey's idea.
The critical leap occurs when Humphrey postulate the existence of "reverbatory feedback loops." Under this theory, consciousness arises when sensory information is shuttled between the nervous system and the brain repeatedly. This mechanism would give temporal continuity to sensation and might well be the foundation for consciousness.
Whether or not you buy this theory, you will be interested to follow Humphrey through the steps that allow him to get to the conclusion. There are numerous simple examples drawn from a broad range of disciplines, that will give you insight into the human brain, even if you resist the final conclusion. However, once you see the theory in its final form, it is pretty beguiling. In fact, Humphrey actually concludes with a discussion of whether the theory is "too simple."
If this is an area that appeals to you at all, this is a book worth reading!
