Word: braine
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...realizing that dreaming occurred outside periods of REM, that it was also common at sleep onset and shortly before waking in the morning. But he found an even weaker spot in the Hobson-McCarley hypothesis. If their theory was right, then people with damage to a part of the brain stem called the pons-the on-off switch for REM sleep-shouldn't be having dreams. Solms, however, had five patients with lesions in precisely that region, and while they weren't having REM, they were nonetheless reporting dreams...
...Even more interesting to Solms were 53 Royal London Hospital patients with healthy brain stems who said they'd stopped dreaming. Most of them had damage to the part of the brain that generates spatial imagery. That made sense: if you can't create pictures in your mind, how are you going to dream? It was the circumstances of the remaining nine patients that fascinated Solms. They had damage to the white matter of the ventromesial quadrant of the frontal lobes, an area linked to the transmission of the chemical dopamine and crucially involved in motivation, urges and cravings. These...
...seemed to Solms that dreams must themselves be associated with driving urges-a very Freudian take-but he needed more evidence in the form of more people with lesions in this particular spot. Nowadays, damage to that part of the brain is rare, normally a result of strokes or tumors. But it was a lot more common in the '50s and '60s when some mental illnesses were treated by removing it in an operation called a prefrontal leukotomy. Solms waded through the literature and found hundreds of case studies in which the effects of this procedure were described...
...Solms, who believes science is getting closer to answering the key questions about dreaming, is leading two studies at the University of Cape Town with that goal in mind. One involves using functional magnetic resonance imaging to try to disentangle the REM brain from the dreaming brain. He wants to obtain images of the dreaming/non-dreaming brain at sleep onset and note the differences between the two. "If we can image what's going on at that point, then we'll get a clear handle on what mechanisms are important for dreaming as opposed to REM sleep," says Solms, who predicts...
...other study involves comparing the sleeping ability of subjects who dream with that of subjects who can't because of brain lesions. Solms argues that because our motivational drive is fully active while we're asleep, our brain's way of keeping us asleep and undertaking the necessary repairs is by tricking us, through dreams, into thinking we're up and about and pursuing our desires. It's the neurological equivalent of putting on a DVD for the kids so the main players in the house can get some shut-eye. "Dreams replace the real actions that are instigated...