As mentioned in Wikipedia, many armchair skeptics have presented explanations for how the footage of the Hutchison-Effect might be faked. Often cited as an example is a piece of video shot by Peter Von Puttkamer in 2003 showing what appears to be a toy UFO suspended on a string as evidence. The video, which aired in a Canadian television broadcast, includes a narrative that describes a single-wire transmission system that John was experimenting with on a particular day. It is not considered to be part of the "classic" Hutchison-Effect, and has no bearing on the veracity of experimental footage shot during the 1980's. The experiment and its intent has been often misinterpreted due to early streaming-video of the footage, which excluded the explanatory narrative.
Another common skeptical accusation is that Hutchison is "tilting the room" (presumably an enclosure that can be rotated on it's axis without changing the camera orientation). This is provided as evidence that simple camera trickery is used to provide the antigravity & levitation effects shown in a variety of Hutchison Effect videoclips. Close examination of the original "lost footage" clearly shows, however, that Hutchison's footage is shot in a variety of areas in concrete-floored rooms, and full-length footage often shows floor-to-ceiling camera-pans that would be impossible for a mounted camera to achieve.
To clarify for the record, the burden of proof appears to demonstrate that the Hutchison Effect is a real and demonstrable natural effect, and that Hutchison is not faking the effect for publicity, money, or other motives.
Interviews with Dr. George Hathaway, Col. John Alexander, and television crews from Japan, Europe, and several networks in North America all verify that documented effects have been witnessed by many people at once, caught on multiple cameras (both amateur and professional), and do not involve simple trickery.
Other skeptics have suggested that while the Effect is real, it is not a natural phemenon, but instead a "psychic" or "PK" (psychokinesis) effect. This seemingly outlandish notion is the result of a report filed by a Stanford Research Institute team in the 1980's, who were funded by INSCOM Colonel John Alexander and focused primarily on researching suspected psychic-phenomenon.
While this team verified that the Hutchison Effect did occur, they were unable to provide a scientific explanation for it, and thus described it as being psycho-kinetic in nature. Hutchison has speculated that the effect might also have been described as PK in order to keep it from being classified by the Army Intelligence and Security Command (INSCOM) as important to national security.
During DVD filming by American Antigravity, we were unable to capture the H-Effect on film due to Hutchison lacking the RF-tube equipment that he used throughout the 1980's to generate the classic effect. This inability (from 1992 to 2006) to recreate the classic Hutchison Effect is in fact the reason that Hutchison was experimenting with other projects, such as the single-wire transmission system filmed by Peter Von Puttkamer. During part of this period of time, John was also under a voluntary test restriction by the local Vancouver mayor, who previously received calls from panicked neighbors during John's experiments.
In March 2006, this situation changed when a former colleague of Hutchison's - Alex Cherechesku - moved to a new house in Vancouver, and during the move returned an original RF tube amplifier to John that had been presumed lost over a decade earlier. Hutchison immediately began new experimentation, and during filming with well-known Canadian paranormal investigator Harold Berndt, was able to demonstrate several hundred pounds of equipment slam itself into an apartment wall with no apparent causal force. American Antigravity plans a return trip to attempt to capture the effect hopefully before the end of the year in 2007.
PhD Electrical Engineer James Corum co-authored a paper in 1981 with graduate-student Terry Keech where they analyzed how the metric tensor & gravity would be modified for a time-varying electric charge. The calculations that they derived & published suggest that a time-varying electric-charge can produce a 'gravitational repulsion' or negative gravitational-mass. Click Here
International Journal of Theoretical Physics (IJTP); Volume 20, 1981, pp. 63-68; Terry Keech and James Corum "New Derivation for the field of a time-varying charge in Einstein's Field-Theory".
Dr. George Hathaway and American Antigravity's Tim Ventura believe that the jellification effects demonstrated by Hutchison may come from a disruption of valence-electron binding by resonant RF interference.
Ventura has designed an experiment to potentially verify this theory by recording the Hutchison Effect on an active sample using a logging multimeter, and then re-apply the same complex RF signal to the same signal at a later time using a linear-amplifier to match the original amplitude. Thus, while the original effect requires a complex arrangement of RF and high-voltage equipment to produce, it may be reproduced with a very simplistic and well-understood apparatus, verifying that a specific resonant signal is what causes the effect, and not psychokinetic or other causal factors.
Another notable factor has come to light since 2005 that also may play an important role in explaining the effect. Hutchison notes that the jellification effect begins in the middle of his sample (lengthwise), at least in the of long aluminum, brass, and steel bars. This may indicate that the length of the sample plays a role in coupling the RF signal that creates the effect to a specific sample