7.1 Auditory verbal hallucinations as symptoms of disordered speech.The perception of auditory hallucinations corresponds to the experience of actual external hearing, despite the absence of any sound itself. Auditory hallucinations correspond with spontaneous neural activity of the left temporal lobe, and the subsequent primary auditory cortex. 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 auditory hallucinations. Newer research has found that they coincide with the left superior temporal gyrus, suggesting that they are better attributed to speech misrepresentations. In the past, the cause of auditory hallucinations was attributed to cognitive suppression by way of executive function failure of the frontoparietal sulcus. Other reasons include hearing loss and epileptic activity. Reports have also mentioned that it is also possible to get musical hallucinations from listening to music for long periods of time. This should be distinguished from the commonly experienced phenomenon of getting a song stuck in one's head. 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. In the latter, people will hear music playing in their mind, usually songs they are familiar with.
Other types of auditory hallucination include exploding head syndrome and musical ear syndrome. 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. These three categories do not account for all types of auditory hallucinations. 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. 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. This may be associated with psychotic disorders, most notably schizophrenia, and this phenomenon is often used to diagnose these conditions. This means that the affected person hears sounds which do not come from the natural environment.Ī common form of auditory hallucination involves hearing one or more talking voices, and this is known as an auditory verbal hallucination. An auditory hallucination, or paracusia, is a form of hallucination that involves perceiving sounds without auditory stimulus.
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