Skeptics of the paranormal attribute the voice-like aspect of the sounds to apophenia (finding of significance or connections between insignificant or unrelated phenomena), auditory pareidolia (interpreting random sounds into voices in their own language which might otherwise sound like random noise to a foreign speaker), artifacts due to low-quality equipment, and simple hoaxes. Likewise some reported EVP can be attributed to radio interference or other well-documented phenomena.
Some EVP is more easily heard and understood than others. And they vary in gender (men and women), age (women and children), tone and emotion. They usually speak in single-words, phrases and short sentences. Sometimes they are just grunts, groans, growling and other vocal noises. EVP has been recorded speaking in various languages.
The quality of EVP also varies. Some are difficult to distinguish and are open to interpretation as to what they are saying. Some EVP, however, are quite clear and easy to understand. EVP often has an electronic or mechanical character to it; sometimes it is natural sounding. The quality of EVP is categorized by researchers:
The most fascinating aspect of EVP is that the voices sometimes respond directly to the persons making the recording. The researchers will ask a question, for example, and the voice will answer or comment. Again, this response is not heard until later when the tape is played back.
EVP also has a visual version termed as ITC. ITC (Intrumental Trans-Communication) Shows images on TV screens, monitors etc, believed by many to be the images of the deceased,As portrayed in the ollywood Movie "WHITE NOISE"
It is important however to remember, that radio signals travelling through space broadcast by ourselves, take many years to reach the earth, it may be possible or feasible to assume that certain EVP could be an interception of one or more of these signals, sent or broadcast over 40years ago and thus only just re-entering the Earths stratosphere and are picked up and detected by our ever expanding array of electrical technology.