KUHF-FM (88.7, Houston), Oct. 24, 2009

Some people have vivid memories of dreams and others don't. Scientists at Caltech may have discovered why dreams are hard to remember, report Norbert Herzog and David Niesel of UTMB's Medical Discovery News. Memories are formed in the hippocampus and stored in the neocortex. Using rats, the researchers mapped the firing of neurons between these two regions of the brain. When the rats entered rapid eye movement or REM sleep, which is when most dreams occur, the neurons were firing but they were not coordinated. "That could explain why some of us can't remember our dreams ... they weren't being stored in the neocortex."