Tsaeb says of dreams
quote:
Someone should write a book about how dreams resemble waking experiences. There probably is one such around somewhere.
Well, there’s been a lot of research done on mental imagery. I think a lot of it can be related to dreaming.
For example, when asked to recall a visual image, the subject has been shown some pictures of animals, and is asked to describe one detail from one picture, say, “What color was the German Shepherd’s collar?”, the test subject, who has sensors on the scalp or in the brain, shows heightened activity in the visual cortex – the part of the brain which becomes active when we are looking at something.
So it seems there is a memory in the actual visual cortex.
I have for years believed that the brain is a kind of machine that’s never switched off.
Its fodder is sensory input, memories, emotions (a kind of ‘mode’) Its operation is making connections, associations, looking for cause/effect relationships (which are just special kinds of associations) , all in the interests of survival.
And the only difference between the waking state and the sleeping state is that in the waking state, we have actaul real-world inputs, for the machine to process. Those inputs are reality-checks.
But in the dream state, without the reality checks, the brain can only process memories including visual and auditory memories, and associations made in the waking state. So that is why we can dream an event and later not clearly remember if it actually happened or was ‘just a dream’.
The brain surgeon Wilder Penfield almost a hundred years ago noticed that when he touched certain points in the living brain during surgery, the patient, who was fully conscious, (the brain itself cannot feel pain; the scalp is locally anesthetized) reported ‘memories’ of events. This caused Penfield to conclude that memories are stored in specific cells. But this was clearly an illogical conclusion. Just because the patient perceived them as ‘memories’ does not mean that they were memories of past events in that person’s life. They could have been memories of dreamed events, or even a completely new illusion caused by – anything, really – a microspark brought on by his metal probe’s inherent static charge.