A poltergeist is defined as a disturbance or energy with bizarre physical effects of paranormal origin that suggest mischievous or destructive intent, such as breaking or moving objects and loud knocks or noises.
The Poltergeist Phenomenon is an exciting, original look at an old subject by an award-winning investigative reporter. The author has reviewed 75 cases and interviewed hundreds of witnesses, paranormal experts, law enforcement officers, psychologists and skeptics to come up with eye-opening results:The typical poltergeist case involves a young person from a repressed home who is going through puberty. He or she may have epilepsy, which produces recurrent spontaneous psychokinesis, a state in which gravity is temporarily suspended.A respected former Princeton University scientist believes he has proven in laboratory experiments that psychokinesis exists and that poltergeist cases are probably true.This rare energy may be part of a person's fight-or-flight system, which is hardwired into everyone and can erupt in certain conditions.

Michael Clarkson has written six psychology books, including Intelligent Fear and The Secret Life of Glenn Gould, and has won many newspaper awards for investigative stories, including a Pulitzer Prize nomination for a rendezvous with reclusive author J. D. Salinger. He is considered an expert in fear, producing new research and lecturing on the subject. While working in the Niagara region, he researched many ghost stories and got the only interview with a young man thought to have caused a poltergeist incident that affected an entire shift of police officers. He lives in Fort Erie, Ontario.

Michael Clarkson's profile page

"I admire Michael Clarkson's clear-sightedness and guts in telling it is like it is."
--Dr. Mihaly Csikszentmihalyi, Professor of Psychology, Claremont University, and best-selling author of Flow
"[Michael Clarkson]...does not take the topic lightly. He brings a fresh approach to the paranormal."
--William Roll, renowned poltergeist investigator and author
"Michael Clarkson got to the next millennium before the rest of us did.... His research and theories on the powers of the human mind and on the fight-or-flight system and its amazing, mysterious powers are well ahead of his time."
--"The Amazing Kreskin," mentalist and television star