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402 Disorders of the Auditory System
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sence of corresponding external acoustic stimuli (Evers & Ellger, 2004). For many years, auditory hallucinations were con­sidered the domain of the psychiatrist or clinical psychologist. However, recently there has been a growing interest among professionals in the field of audiology perhaps related to two factors: (1) audi­tory hallucinations are not only seen in people with psychiatric problems but also in those with auditory difficulties, and
the experience of auditory hallucina-
(2) tions can be viewed as an auditory distur­bance for which there is an anatomic and physiologic correlate. Individuals who suffer from auditory hallucinations with­out any comorbid psychiatric illness have to be considered to have a form of audi­tory dysfunction. It also seems reasonable that, even in patients with psychiatric ill­ness, the auditory system is involved in generating the hallucinations. Individu­als with auditory hallucinations do per­ceive sound in some form; therefore, the auditory perceptual mechanism must be activated in some manner. This activation is supported by functional imaging stud­ies as will be discussed later. In this brief review, auditory hallucinations related to drugs and parkinsonism, although men­tioned, will not be addressed in detail as such coverage would be beyond the scope of the present discussion of this particular symptom.
Auditory hallucinations come in many forms and can be perceived as whistles, bangs, clapping, ticks, screams, voices, intelligible or unintelligible speech, sing­ing, and instrumental music, as well as other permutations of sound (Bentall,
1990). The definition and many of the examples of the perceived sounds in audi­tory hallucinations could, in part, be con­fused with tinnitus; although most would agree that tinnitus, as it is commonly rec-
ognized, would seldom take the form of voices, singing, speech, or music. In addi­tion, there can be auditory hallucinations that are perceived as multiple sounds simultaneously or as different sounds that are perceived at different times. In many cases, however, the sounds heard are sim­ilar for each instance of an auditory hal­lucination (Musiek et al., 2007).
Symptoms
Like tinnitus and hyperacusis, an audi­tory hallucination is a symptom. It could be associated with a peripheral or central auditory problem and/or with a psychi­atric disturbance. In some cases, halluci­nations in other sensory modalities (pri­marily visual) can co-occur with auditory hallucinations. The experience of auditory hallucinations can be quite disturbing to the individual. As a result, the individual may become nervous, tense, irritated, and/or worried (Tien, 1991). This psy­chological “baggage” makes the halluci­nations much worse.
Incidence and Prevalence
Studies on the prevalence of auditory hal­lucinations show statistics that are higher than one might expect. In a large sample of adults ranging in age from young to old, between 2% and 3% reported expe­riencing auditory hallucinations (Rem­schmidt, 2002). Tien (1991) reported the incidence of auditory hallucinations also to be in the 2% to 3% range and the preva­lence to be between 10% to 15%, with little influence of age until the 8th decade of life. The most commonly reported audi­tory hallucination is “hearing” voices (Sacks, 2012). In addition to the incidence and prevalence data reported previously,
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Tien (1991) also reported that auditory hallucinations were more common among women than men and that visual halluci­nations were the most frequently reported hallucinogenic symptom, followed by auditory, somatic, and olfactory halluci­nations. It is notable that prevalence of auditory hallucinations ranges from 60% to 80% in the schizophrenic population (Lim, Hoek, Dean, & Blom, 2016). A factor potentially influencing the incidence and prevalence of auditory hallucinations is tinnitus. Tinnitus is sometimes difficult to discern from auditory hallucinations, especially in its more complex forms. It therefore may be mistakenly identified as an auditory hallucination rather than as tinnitus.
Etiology and Pathology
As previously stated, auditory halluci­nations frequently are associated with psychiatric disorders, but they also can be related to peripheral and/or central involvement of the auditory system. In regard to psychiatric disorders, as men­tioned earlier, schizophrenia is the con­dition most commonly associated with auditory hallucinations (Lim et al., 2016; Shergill, Murray, & McGuire, 1998). Depression, compulsive disorder, and a host of other psychiatric symptoms have also been linked with auditory hallucina­tions, but the coincidence is extremely small. Long-standing moderate to severe hearing loss could be the basis for some auditory hallucinations, especially in the elderly population (Berrios, 1990). This is likely related to what can be a long dura­tion of auditory deprivation secondary to the hearing loss. There also have been many reports linking focal brain lesions (epilepsy, tumors, strokes) and degenera-
tive diseases to the occurrence of auditory hallucinations (Evers & Ellger, 2004; see Musiek et al., 2007). A summary of pos­sible causes of auditory hallucinations can be found in Table 8–2.
The pathophysiologic mechanisms underlying auditory hallucinations are unknown. However, the leading theory seems to be one of reduced neural connec­tivity and the existence of random neural discharges in the auditory regions of the brain. In brief, the reduced neural connec­tivity is presumed to be related to a loss of neural connections as a consequence of deprivation, damage, aging, and other mechanisms, which results in regions of the brain functioning in isolation (i.e., not appropriately connected to other brain regions) and randomly creating perceived sounds. The neural discharge theory pro­poses that (damaged) neural generators in the auditory cortex similar to epileptic foci give rise to the firing of neuron groups that results in the auditory hallucination (Alderson-Day et al., 2016; David, 1994; Musiek et al., 2007).
Site of Lesion
It is logical and likely that auditory hal­lucinations are caused by compromise of the auditory cortex and other related brain regions. The classic human neuro­surgical study performed by Wilder Pen­field and his colleague (Penfield & Perot,
1963) demonstrated that auditory percep­tions can be triggered by electrical stimu­lation of the auditory cortex. This finding opened the door to the likelihood that the auditory cortex could play an integral part in the occurrence of auditory halluci­nations. As was alluded to earlier, damage to the central auditory nervous system has been linked to auditory hallucinations in a
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Table 8 –2 . Examples of Medical, Psychotic/Psychological, and Transient Conditions That Can Cause Auditory Hallucinations
Type Possible Causes
Medical Medical Disease or Surgical Complications
• Delirium, metabolic disorders, sepsis, heart failure, postoperative
and posttraumatic states, high fevers and infections, thyroid disease
Medication- and/or Substance-Induced
Side effects
• Hallucinogens, hallucinosis
Ear Disease
• Hearing loss
Disease of the Nervous System
• Alzheimer’s disease, dementia, Parkinson’s disease, cerebral
vascular disease, tumor, abscess, contusion, subdural hematoma, meningitis, encephalitis, migraine headaches, epilepsy
Psychiatric/ Physiological
Transient Sleep-Wake Disturbances
Source: Based on Chaudhury (2010), Prerost, Sefcik, & Smith (2014), and Traynor (2018).
temporal manner in many patients, with these perceptions occurring at the time of or shortly after the event (e.g., during or following a stroke).
Perhaps the most compelling evi­dence for a central nervous system locus for auditory hallucinations comes from anatomic and functional imaging stud-
Substance-Related Disorder
• Alcohol intoxication/withdrawal
Psychotic Disorder
• Schizophrenia, affective disorders (severe depression, mania),
dementia, postpartum psychosis, borderline personality disorder
Posttraumatic Stress Disorder
Intense Emotional Stress
Hypnagogic, hypnopompic
Deprivation (sleep, food, or sensory)
Bereavement
Prolonged Isolation
ies (Highley, McDonald, Walker, Esiri, & Crow, 1999; Shergill et al., 2004). Anatomic studies point toward smaller auditory cortices in individuals with schizophrenia and auditory hallucinations. Functional magnetic resonance imaging (fMRI) stud­ies have shown increased cortical activity in the left inferior frontal gyri and right
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middle temporal gyri that occurred prior to and during the perception of an audi­tory hallucination. In addition, activation of the left insula (structures that are highly auditory in nature) occurred with the per­ception of the hallucination. There is also evidence which demonstrates a correla­tion between the gray matter volume in the left temporal lobe (left superior tem­poral and Heschl’s gyrus) and the severity of auditory hallucinations (Modinos et al.,
2013). In addition, there have been reports that argue that the brain activity related to an auditory hallucination could be sub­cortical, but it is likely to involve complex interactions between the brainstem and cortex (see Musiek et al., 2007).
Medical and Audiologic Evaluation
The medical evaluation of hallucinations requires a psychiatric and/or neurologic consult. If the patient has no psychiatric problems, the focus should be on neurol­ogy; however, if the patient is at risk for a psychiatric condition, then the psychia­trist becomes the key professional. The focus of both of these professionals is to find the underlying cause. For example, if a person suffered a temporal lobe stroke and auditory hallucinations appeared in the same time period, the objective fol­lowing evaluation would be to treat the stroke. Often, however, there is no clear underlying cause, especially in psychiat­ric cases. A thorough medical and psy­chiatric history is essential. It is impor­tant that drug use be ruled in or out as a cause of the auditory hallucination. Long­standing, severe hearing loss can also be a factor that needs to be considered, espe­cially in the elderly. Details of the medical and psychiatric evaluation of patients pre-
senting with auditory hallucinations are beyond the scope of this chapter. For more information on these topics, see Griswald, Del Regno, and Berger (2015).
There is a paucity of data on the audiologic assessment of auditory hal­lucinations. Clearly, the direct evaluation of auditory hallucinations is difficult. Perhaps the most direct approach would be to try to mask the auditory hallucina­tions. In one of the author’s (FM) expe­rience, masking of an auditory halluci­nation can be accomplished, but much depends on the specific type of auditory hallucination that the patient is experienc­ing and how well the masker matches the type of sound(s) composing the auditory hallucination(s). Perhaps the most useful audiologic evaluation of auditory hallu­cinations is not the evaluation of the hal­lucination itself but rather the audiologic evaluation of the integrity of the central auditory nervous system. This approach assumes the auditory hallucinations are related to dysfunction of the central audi­tory system.
There have been some studies of di­chotic listening, speech-in-noise recogni­tion performance, and auditory evoked potential assessments that have demon­strated differential performance for indi­viduals with schizophrenia and auditory hallucinations when compared to groups of subjects without auditory hallucina­tions. These studies have essentially taken two approaches. One is that performance of subjects with auditory hallucinations has been compared to either normal con­trols (Løberg, Jørgensen, & Hugdahl,
2004) or to a group of normal controls and a group of subjects with schizophrenia without auditory hallucinations (McKay, Headlam, & Copolov, 2000). The second approach assessed subjects who have intermittent auditory hallucinations while
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they are experiencing hallucinations and when they are not (Tiihonen et al., 1992). Those with schizophrenia and auditory hallucinations, as a group, performed more poorly than the other groups (see Musiek et al., 2007, for a more detailed review of these studies). This poor perfor­mance on central auditory tests is likely related to the possible degenerative neu­ral process that accompanies schizophre­nia and auditory hallucinations. This link is an important one and one that is con­sistent with the literature on central audi­tory evaluation. That is, the relationship between reduced central auditory function as measured by central tests (with proven sensitivity) and reduced neural substrate has been well established. Although more work is needed, there clearly is emerg­ing evidence showing a link between reduced volumes of auditory cortex (and/ or related areas) and those with auditory hallucinations and schizophrenia.
Models for the Generation of Auditory Hallucinations
As has and will be mentioned again later, auditory hallucinations can be triggered
by neurologic disorders — especially those
affecting the central auditory system. Also, hearing loss, aging, and sound depriva­tion from communication seems to be linked to auditory hallucinations. How­ever, perhaps of greater interest are the models for the underpinnings of auditory hallucinations in those with schizophre­nia. There are many models that have been proposed but here only two of the more popular ones will be discussed. One model is the inner speech model (ISM), sometimes termed the mis-attribution model. The other is the theory of reduced
connectivity, also termed the abnormal auditory cortex activation model. The ISM model is based on the idea that the patient with auditory hallucinations can­not distinguish from internally generated perceptions and externally generated ones (Waters et al., 2012). The connectiv­ity model is one that focuses on abnormal neural discharges from the auditory cor­tex and/or other central auditory areas as the basis for the hallucinations. These abnormal discharges in turn result in poor connectivity among neurons and neuronal pathways in the brain. This “misfiring” of fibers and the lack of proper conduc­tion of electrical impulses in the auditory system may be perceived as words, music sounds, or other auditory sounds by the individual with schizophrenia. Although this model was proposed to explain the basis for the auditory hallucinations expe­rienced by patients with schizophrenia, it also fits the neurologic and hearing loss etiologies (see Alderson-Day, McCarthy­Jones, & Fernyhough, 2015, for review).
Medical and Audiologic Treatment
Treating underlying medical disorders is the first route to help those with auditory hallucinations. These underlying causes could encompass a number of disorders or conditions, ranging from high fevers to trauma. Medical intervention is key if the underlying cause is found. Although one of the most common provoking causes is the illicit use of hallucinatory drugs, sev­eral prescribed medications can also trig­ger auditory hallucinations. Treatment for auditory hallucinations in these cases typically involves the cessation of the use of the drug or medication, and in some
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cases, the prescription of an alternative medication. Such approaches can often reduce and/or arrest the auditory hallu­cinations. There are also pharmacologic agents that are used to treat auditory hal­lucinations. For example, dopamine cho­linesterase inhibitors have been shown to be useful in treating hallucinations in some patients (Korczyn, 2001). However, in many cases, the cause of the auditory hallucination cannot be determined, and in other cases, the origins of the halluci­nation may be identified, but no medi­cal treatment is available. In these cases, other forms of therapy have been tried with varying degrees of success.
Shergill et al. (1998) reviews a num­ber of nonmedical therapies for auditory hallucinations. Counseling and educa­tion of the patient appear to have posi­tive results for some patients. In addition, relaxation therapy, distraction techniques, mood monitoring, and discussion classes have all been tried but have not proven to be highly successful. More studies on the effectiveness of these therapies are needed before these approaches are rou­tinely recommended.
One treatment that seems to hold some promise for controlling auditory hallucinations is transcranial magnetic stimulation (TMS) (Koops, van den Brink, & Sommer, 2015). This procedure is a non­invasive technique used to stimulate vari­ous regions of the brain. A magnetic coil applied to the scalp generates a current that passes through the scalp and stimu­lates brain tissue (Haraldsson, Ferrarelli, Kalin, & Tononi, 2004). This technique has approximately a 50% success rate. However, many investigators feel its full potential in the treatment of hallucina­tions has not been realized (Haraldsson et al., 2004).
Interestingly, acoustic treatments have been tried with patients with auditory hal­lucinations with mixed results (Collins, Cull, & Sireling, 1989; Nelson, Thrasher, & Barnes, 1991). The use of sounds of vari­ous types to distract the patient’s attention from the hallucination has been employed as an intervention strategy. In some cases, this intervention has worked to a mod­erate degree but, in other patients, this approach was not effective. Masking is also a consideration that could potentially help some patients. In individuals with long-standing hearing loss, deprivation is potentially a key factor and the fitting of amplification could be a major help.
summaRy
Tinnitus, hyperacusis, and auditory hal­lucinations are all auditory disorders/ symptoms that affect many people and are of concern to the hearing health pro­fessional. None of these disorders/symp­toms has a cure at this time, but they all can be managed to some extent. Theo­ries abound regarding their underlying pathophysiologies. However, none of these theories account for the many dif­ferences that often exist between patient reports and their persistent difficulties. Nonetheless, progress is being made in these areas, especially with the use of functional imaging techniques. As a result of the progress that has been made, it has become increasingly clear that the brain is more involved in these symptoms and their underlying disorders than has been previously appreciated. This understand­ing, coupled with further research, could lead to advances in both the diagnosis and management of these three auditory
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disorders/symptoms. The importance of careful and insightful audiologic, otologic, and neurologic evaluations of patients with tinnitus, hyperacusis, and/ or auditory hallucinations cannot be over­stated. This triad of hearing disorders/ symptoms highlights the importance of the ear–brain relationship and the need to have several professionals involved in the assessment and management of patients with these disorders/symptoms.
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