Auditory Hallucinations: Causes, Treatment & Types

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  • 0:02 Auditory Hallucinations
  • 0:51 Causes
  • 2:30 Types
  • 4:32 Treatments
  • 6:14 Lesson Summary
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Lesson Transcript
Instructor: Tara DeLecce

Tara has taught Psychology and has a master's degree in evolutionary psychology.

Auditory hallucinations are reported in many different psychological disorders, especially schizophrenia. In the following lesson, you will find out what causes people to 'hear voices,' what the voices commonly say, and how to make the voices stop.

What Are Auditory Hallucinations?

Auditory hallucinations are false perceptions of hearing sounds, like voices, music, etc.,without any real sensory stimuli. Auditory hallucinations have been reported in those suffering from epilepsy, brain tumors, migraines, dementia, Alzheimer's disease, Lewy body dementia, bipolar disorder, post-traumatic stress disorder, and Parkinson's disease. These hallucinations have also been known to be induced by drugs, such as cocaine and amphetamines.

Perhaps most surprisingly, auditory hallucinations have been reported in approximately 15% of people with no mental or physical health problems whatsoever. The most common condition associated with auditory hallucinations, however, is schizophrenia, with a reported 70% of schizophrenic patients experiencing them.

Causes of Auditory Hallucinations

At the biological level, auditory hallucinations, and hallucinations of the other senses, are strongly linked to an imbalance of chemicals in the brain. Specifically, a chemical called dopamine has been documented in excessive amounts not only in schizophrenics, but in people experiencing drug-induced hallucinations. When dopamine is reduced to normal levels through medication, this often causes a significant reduction in hallucinations or at least a decrease in their intensity.

Another brain abnormality linked to auditory hallucinations is abnormal activity of the thalamus, which is a structure in the brain that is responsible for organizing information received from the senses and sending it toward more complex brain regions. Basically, the thalamus sends information from the ears to the auditory cortex in the brain, which interprets what sounds are being heard. In the case of auditory hallucinations, the thalamus becomes very active despite a lack of external sound waves that would normally reach the ears and then cause such activity. In schizophrenics, the thalamus is not only overactive but reduced in size.

In addition to the abnormal activity of the thalamus and auditory cortex, abnormal activity in the right side of the brain, or right hemisphere, has also been associated with auditory hallucinations. In the normal brain, much of the brain activity involved with language is specialized in the left hemisphere. The right hemisphere is normally inhibited in regard to language. In patients suffering from auditory hallucinations, it has been found that there is no such specialization between brain hemispheres, and the right can be just as active as the left for activities involved in language.

Types of Auditory Hallucinations

The classification system of auditory hallucinations is not well defined, but different features have been identified, typically in patients with schizophrenia. The most common type of auditory hallucination is hearing voices, and in acute schizophrenic episodes, the voices almost always involve negative content.

These voices can either be perceived as coming from inside the patient's head or from an external source, often inanimate objects. They can come in the form of only one voice talking directly to the patient or many voices talking amongst each other, usually about the patient, but no matter how they are manifested, they are believed to be real by the person experiencing them.

As mentioned earlier, the content said by these imagined voices is often negative. More specifically, they can take the form of insults or threats directed toward the person experiencing them or can give the person experiencing them demands to do terrible things, such as kill someone.

Another type of auditory hallucination is a voice that repeats the same phrase. In some cases, entire memories, usually of a traumatic nature, are lived out again and again, as if they are actually happening. The realistic replay of memories seems to be more common in those suffering from post-traumatic stress disorder, unlike the other types described which are usually associated with schizophrenia.

When acute episodes of schizophrenia have passed and a patient is in remission, the content of imaginary voices can become more positive. The voices tend to turn from insulting to supportive and are directed at the encouragement of social interaction with real people rather than the imaginary voices.

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