Torm said:The brain is an electromagnetic pattern. If an electromagnetic pattern is in one place for long enough - say, where the person's head always rested in a favorite chair over many years - then, just as putting up a polluting factory can alter the weather patterns in the area, this person's brain pattern may begin to alter the local electromagnetic "weather" pattern of the room they are in in a specific way.
The brain isn't really an electromagnetic pattern. However, there are detectable electromagnetic phenomenon associated with it. What you are talking about, then, is effectively a very long-exposure photograph. WIthout any camera or focusing device.
The problem is that for long-exposure photographs to produce an image, the light source needs to be still. Very still. For a very long time. Even that person who always sits in the chair moves his head around quite a bit. And unless he's always thinking the exact same thing, he won't be putting out the same picture.
Plus, our world is loaded with EM radiation more powerful than that put out by the brain - sunlight, radio waves, and so on. Any "picture" should be thoroughly overexposed.
Ghosts are occasionally associated with locations where a single person persisted for a long period of time. More often, though, they are associated with traumatic events that take very little time, which doesn't seem to tie in well with your hypothesis.
Nor does your hypothesis explain photographs taken or sounds recorded at sightings. Tape machines and cameras aren't human brains. You think a tape recorder will take down these imprinted thoughts as audible words? And cameras will take them up as images of human faces?
Later, when someone else has moved into the house, at some point, they may have their head in just the right position in the house's pattern to "pick up" some of the patterns from the first person.
How does this explain phenomena that persist as the observer moves throughout the house? Typically, these things don't happen when the observer is standing stark still.