An<unk> , or paracusia, is a form of hallucination that involves perceiving sounds without<unk>  stimulus. A common form of<unk>  involves hearing one or more talking voices, and this is known as an<unk>  verbal hallucination. This may be associated with psychotic disorders, most notably schizophrenia, and holds special significance in diagnosing these conditions. However, individuals without any psychiatric disease whatsoever may hear voices, including (but not limited to) those under the influence of mind-altering substances, such as cannabis, cocaine, amphetamines, PCP, among others. There are three main categories into which the hearing of talking voices often fall: a person hearing a voice speak one's thoughts, a person hearing one or more voices arguing, or a person hearing a voice narrating their own actions. These three categories do not account for all types of<unk> s. Hallucinations of music also occur. In these, people more often hear snippets of songs that they know, or the music they hear may be original, and may occur in normal people and with no known cause. Other types of<unk>  include exploding head syndrome and musical ear syndrome. In the latter, people will hear music playing in their mind, usually songs they are familiar with. This can be caused by: lesions on the brain stem (often resulting from a stroke); also, sleep disorders such as narcolepsy, tumors, encephalitis, or abscesses. This should be distinguished from the commonly experienced phenomenon of getting a song stuck in one's head. Reports have also mentioned that it is also possible to get musical hallucinations from listening to music for long periods of time. Other reasons include hearing loss and epileptic activity. In the past, the cause of<unk> s was attributed to cognitive suppression by way of executive function failure of the frontoparietal sulcus. Newer research has found that they coincide with the left superior temporal gyrus, suggesting that they are better attributed to speech misrepresentations. It is assumed through research that the neural pathways involved in normal speech perception and production, which are lateralized to the left temporal lobe, also underlie<unk> s.<unk> s correspond with spontaneous neural activity of the left temporal lobe, and the subsequent primary<unk>  cortex. The perception of<unk> s corresponds to the experience of actual external hearing, despite the absence of any sound itself.
Auditory hallucination
Automatism 
Musical hallucinations
Closed-eye hallucination
Automatic behavior
Acholia
Hallucination
Snatiation