Clairaudience or "Clear Hearing", is usually defined as the ability to hear the voices or thoughts of spirits. Some Mediums hear as though they are listening to a person talking to them on the outside of their head, as though the Spirit is next to or near to the medium, and other mediums hear the voices in their minds as a verbal thought.
These indiviuals that possess these powers are actually hearing an EVP "ELECTRONIC VOICE PHENOMENON" as it actually happens. Many startling voice captures of full conversations are ofen recorded as these persons communicate with a spirit or ghost in a full conversation. Some say they actually hear it in their ears as if somone is either whispering or speaking clearly and audiably to them. still others say they hear it in their minds.
The ear is the sense organ that detects sounds. The vertebrate ear shows a common biology from fish to humans, with variations in structure according to order and species. It not only acts as a receiver for sound, but plays a major role in the sense of balance and body position. The ear is part of the auditory system.
The word "ear" may be used correctly to describe the entire organ or just the visible portion. In most animals, the visible ear is a flap of tissue that is also called the pinna. The pinna may be all that shows of the ear, but it serves only the first of many steps in hearing and plays no role in the sense of balance. In people, the pinna is often called the auricle. Vertebrates have a pair of ears, placed symmetrically on opposite sides of the head. This arrangement aids in the ability to localize sound sources.
In the field of parapsychology, clairaudience [from late 17th century French clair (clear) & audience (hearing)] is a form of extra-sensory perception wherein a person acquires information by paranormal auditory means. It is often considered to be a form of clairvoyance. Clairaudience is essentially the ability to hear in a paranormal manner, as opposed to paranormal seeing (clairvoyance) and feeling (clairsentience). Clairaudient people have psi-mediated hearing. Clairaudience may refer not to actual perception of sound, but may instead indicate impressions of the "inner mental ear" similar to the way many people think words without having auditory impressions. But it may also refer to actual perception of sounds such as voices, tones, or noises which are not apparent to other humans or to recording equipment. For instance, a clairaudient person might claim to hear the voices or thoughts of the spirits of persons who are deceased. Clairaudience may be positively distinguished from the voices heard by the mentally ill when it reveals information unavailable to the clairaudient person by normal means (including cold reading or other magic tricks), and thus may be termed "psychic" or paranormal.
Audition is the scientific name for the perception of sound. Sound is a form of energy that moves through air, water, and other matter, in waves of pressure. Sound is the means of auditory communication, including frog calls, bird songs and spoken language. Although the ear is the vertebrate sense organ that recognizes sound, it is the brain and central nervous system that "hears". Sound waves are perceived by the brain through the firing of nerve cells in the auditory portion of the central nervous system. The ear changes sound pressure waves from the outside world into a signal of nerve impulses sent to the brain.
Interaural level differences (ILDs), sometimes called interaural intensity differences (IID), are differences of the soundpressure level arriving at the two ears; and are important cues that humans and animals use to localise higher frequency sounds. The interaural time difference is another source of information for sound localization. Our ears are only sensitive to sound pressure changes.
Neurons sensitive to ILDs are excited by stimulation of one ear and inhibited by stimulation of the other ear, such that the response magnitude of the cell depends on the relative strengths of the two inputs, which in turn, depends on the sound intensities at the ears.
In the auditory midbrain nucleus, the inferior colliculus (IC), many ILD sensitive neurons have response functions that decline steeply from maximum to zero spikes as a function of ILD. However, there are also many neurons with much more shallow response functions that do not decline to zero spikes.