Shame is a self-conscious emotion marked by an intensely negative self-evaluation. It is exhibited by an individual upon realizing that she/he has violated an important (usually social) norm. Shame can be a source of emotional distress leading to social withdrawal and depression, with a significant negative impact on quality of life. In Parkinson’s disease (PD), shame is rarely addressed. Based on reports of persons affected with Parkinson’s disease (PwP) as well as a literature review, this article describes PD-related shame. PD-related shame may emerge from motor and non-motor symptoms, from self-perception of inadequacy due to loss of autonomy and need for help, or from perceived deterioration of body image. The neurobiology of shame delineates neuronal networks involved in cognitive and emotions regulation, self-representation and representation of the others mental states. Although this hypothesis remains to be demonstrated, these substrates could be modulated, at least partially, by dopaminergic depletion related to PD, which may open a window for pharmacotherapy. Owing to the negative impact that shame can produce, shame should be actively explored and addressed in the individual PwP. Teaching PwP how to develop resilience to shame may be a useful strategy in preventing the vicious circle of shame. The paucity of existing data on prevalence and management of PD-specific shame contrasts with the manifold reported situations inducing suffering from shame. There is a crucial need for further investigations of shame in PD and the development of interventions to reduce its impact on PwP’s quality of life.
In addition to motor symptoms, persons affected with Parkinson’s disease (PwP) perceive non-motor and/or psycho-emotional symptoms as serious challenges and barriers to a satisfying quality of life . Parkinson’s disease (PD)-related shame and embarrassment are important sources of emotional distress . However, these symptoms are rarely addressed in clinical practice nor studied in neuroscience research. In this review, we will first define shame and review psychological studies on shame. We will then move to the neurobiology of shame and describe PD-related shame as reported by PwP and the available literature. We will finish by addressing consequences of shame on PwP’s quality of life and by discussing the management of shame in PwP.
EMPIRICAL PSYCHOLOGICAL STUDIES ON SHAME
There are abundant empirical psychological studies examining shame as important human emotion. We will define shame, discuss its dimensions distinguishing it from other constructs with which it is often associated and/or confused [3–7].
2.1Definition of shame
Shame is a ubiquitous self-conscious emotion marked by intensely painful negative self-evaluation commonly exhibited by an individual upon realizing that he/she has committed an offense or violated an important (usually social) norm. Further, and upon contemplating the transgression, the individual concludes, that he/she is incapable, worthless, fundamentally flawed, reprehensible and worthy of contempt. Shame contributes to a sense of powerlessness, a feeling of being small, a sensation of shrinking, being exposed, and wanting to disappear.
2.2Shame, as a “self-conscious” emotion is different from a “basic” emotion
Shame differs from the basic emotions (i.e., anger, happiness, fear, disgust, surprise, and sadness) proposed by Darwin and further elaborated by Ekman . Psychological researchers characterized basic emotions as biologically based, more automatic, rapidly mobilizing, shared with other animals, exhibiting universally recognized facial expressions. Basic emotions can be studied independently of verbal reports of internal experience. On the other hand, more complex emotions such as shame, guilt and embarrassment require cognitive capacities such as self-awareness (the “I” self) and complex self-representations (the “me” self or ideal representations one selects as the pillars of our identity) . These moral emotions are important for the development and maintenance of interpersonal relationships because they act as social regulators promoting social functioning by encouraging a balance between the individual’s urges and the rights and needs of others [9, 10]. However, dysregulation in the experience of these emotions may lead to anxiety and depression. Moral emotions show weaker evidence of universality and are harder to elicit in the laboratory. To experience a basic emotion such as fear, the cognitive appraisal involved is relatively simple: does the impinging event threaten safety and survival ? To experience shame, however, one must engage in complex causal attributions, like “how do I appraise my behaviors or transgressions”; “how others see me and appraise me on account of it” “how I appraise their appraisals”, and so on. A person’s shame can be measured by valid and reliable tests or instruments such as the Test Of Self-Conscious Affect (TOSCA) .
Shame, embarrassment and guilt have a number of broad characteristics in common. All three negative moral emotions occur when the rules or social norms, defining what is right or wrong, are broken. However, these emotions also have distinct features.
2.3Shame is not guilt
Shame and guilt are different constructs. The prevailing distinction, the one that has received empirical support, was first proposed by Lewis (1971) more than four decades ago . The author argued that the fundamental difference between shame and guilt centers not on whether one occurs in public and the other in private as once proposed, but on the crucial role of the self. Shame arises when an individual, aware of a transgression, believes that their transgression of certain rules defines who they are, and concludes that he/she is fundamentally flawed as a person. Meanwhile, in guilt, the appraisal and injunction are confined to one’s specific behavior or set of behaviors. This distinction is one of “I am bad” versus “I did something bad”. The former implicates the whole self, while the latter focuses on more limited behavioral aspects of that self. Shame and guilt are associated with potentially debilitating emotions and behaviors. Pangs of shame, however, are experienced as more acutely painful than those triggered by guilt. While the action tendency in guilt is to want to make things better, confess, or apologize, the action tendency in shame is to escape and disappear, to isolate emotionally and socially, to experience depressive mood or anger which could culminate in thoughts of self-injury or injury to others. Shame and guilt have a different relationship to empathy, while guilt is associated to “other-oriented empathy”, shame’s connection to empathy appears to be disrupted and focuses on “self-oriented distress” .
2.4Embarrassment and shame: Two closely related self-conscious emotions
No consensus has been reached on how shame and embarrassment differ . Embarrassment has long been considered as a dimension of shame, as a variation on the same continuum of emotion, varying on a range of factors such as intensity, public exposure and physical reaction . As noted, shame, is about perceived or misperceived, serious transgressions or violations of norms which indict the total self, one’s essence, as bad or reprehensible. People who experience shame feel acutely distressed. Embarrassment, meanwhile, is about minor transgressions or failures in role enactments or failure in one’s ability to present her/himself to others in an ideal manner (one’s carefully crafted and protected social persona). Compared to shame and guilt, embarrassment is associated with a motivational response directed towards the preservation of one’s social reputation, rather than a concern for others’ wellbeing and a need to make amends, as in guilt, or with a concern for oneself with a need to hide as in shame . The transgression is perceived as a “faux pas”, as in the case of a forgotten name, and unzipped fly, tripping in front of an audience, showing clumsiness, awkwardness or absent mindedness. As shame, embarrassment can be distressing and trigger a wanting to disappear or exit the field. More often it is experienced as social discomfort, as a less intense and negative feeling than shame. As time passes, embarrassed people recollect the transgression and can laugh at the past “faux pas”. There is no humor, only distress, when recalling shame.
2.5Types of shame and inter-individual variability
Gilbert characterized two types of shame, internal and external shame . Internal shame describes the negative evaluation a person applied to her/himself. External shame relates to the evaluation of what one’s believe others would reject and involves a distressing awareness that others view the self negatively.
Not everyone experiences shame equally. There is an inter-individual variability in experiencing shame depending on self-awareness, personality traits, level of self-esteem and self-blame, and culture. The fundamental experience of shame is universal. However, there are significant variations across cultures in how emotions are understood, defined and expressed [16, 17]. This perspective posits that emotions are embedded in specific cultural ideals and practices, which vary across domains. In the case of self-conscious emotions such as shame it is worth noticing that some social groups view the self in individualistic, psychological terms, a self that is bounded, separate from others. Meanwhile, other cultures favor a collectivist ethos wherein an emotion such as shame is not a psychological event occurring inside an individual but it is something that happens interpersonally, outside, between people . Conceivably, then, the appraisal of how shame is fell, expressed, and the responsibility for resolving it varies as well .
2.6Consequences of shame
Shame proneness leads to psychological maladjustment and is linked to higher rates of depression due to negative attributional style . Higher feelings of shame are also correlated with negative affectivity social anxiety . Given the relationship between symptoms of depression such as feelings of worthlessness and shame, and suicidal ideation, special attention should be given to patients presenting with a tendency towards shame.
THE NEUROBIOLOGY OF SHAME
While many studies have investigated the neural correlates of basic emotions, far less research has investigated the neural basis of shame . Functional magnetic resonance imaging (fMRI) studies have either used short sentences designed to evoked shame  or autobiographical recall tasks where participants were instructed to remember personal events that elicited shame among other emotions [23, 24]. In healthy subjects, shame compared to a neutral condition has been associated with increased activation in prefrontal cortices (PFC) (dorsolateral PFC [22, 23], the ventrolateral PFC  and the dorsomedial PFC [22, 24]), temporal cortices (the anterior inferior temporal, anterior middle temporal , anterior superior temporal cortices ), and in the anterior insula cortex [22–24]. In addition, increased activations have been reported in parietal regions (including angular gyrus and the precuneus ), posterior cingulate cortex , parahippocampal gyrus , basal ganglia  and sensorimotor areas [22, 23]. Shame has been associated with decreased activity in the superior parietal cortex and supramarginal gyrus . Shame has also been compared to other negative moral emotions. A number of brain regions are common between self-blaming negative emotions such as shame, guilt and embarrassment. Shame and guilt are both associated with insula activation. The insula is involved in interoceptive awareness  and emotional state representation especially in relation to processing subjective feelings, empathy, uncertainty , and in disgust toward the self . Shame and guilt are also both associated with dorsal anterior cingulate cortex (ACC), a structure that has been shown to play a role (among others) in the experience of distress . Shame and embarrassment are both associated with hippocampal and midbrain function. The hippocampus has been associated with several functions such as memory, emotion processing and regulation of stress [29, 30], and in responding to psychosocial stress [31, 32]. Shame has been shown to have some neurobiological specificity. Michl reported increased activation for shame compared to guilt in the dorsolateral PFC, the insula cortex, the dorsal ACC, the posterior cingulate cortex (PCC) and in subcortical areas including the parahippocampal cortex and the dorsal anterior midbrain . Shame appeared to be uniquely associated with dorsolateral PFC, posterior cingulate cortex and sensorimotor cortex function. Lateral PFC plays a role in the engagement of both cognitive and emotions regulation processes . It might be hypothesized that shameful feelings require harder mental work to regulate the associated negative affect in comparison to guilt and embarrassment. This assumption is in line with the theoretical definition of shame describing it as a more damaging and distressful emotional experience. PCC is important in self-representation , a mental process related to moral reflection which is in line with the definition of shame as an emotion associated with strong concern with one’s own evaluation and a particular focus on the self. To help visualize cortical areas activated by shame, embarrassment and guilt, Fig. 1 presents a summary of the brain regions activated in the only 4 fMRI studies comparing these negative moral emotions with one another in healthy controls [22, 24, 35, 36].
The majority of studies investigating shame has involved healthy controls. A few studies have investigated shame in psychiatric disorders such as depression  and obsessive compulsive disorders . To the best of our knowledge, shame in PwP has not been studied. However, it is interesting to note that shame activated basic emotional as well as self-referential circuits, such as PFC, insula, posterior cingulate cortex and brain areas implicated in the representation of the mental states of others (Theory of Mind).
The role of dopamine in the feeling of shame remains to be elucidated. PD being secondary to neurodegeneration involving predominantly dopaminergic neurons whose clinical consequences can be compensated with dopaminergic replacement therapy , PD gives the opportunity to study the role of dopamine in this type of feeling. However, to the best of our knowledge, no studies have explored the role of dopamine in the feeling of shame. A role of dopamine can be suspected on different grounds. First of all, the cortical structures implicated in the feeling of shame such as the PFC, the ACC, the PCC, and the insula  are all activated by dopamine release from mesocortical projections. Thus degeneration of dopaminergic cells in the ventral tegmental area in PD is likely to affect feelings of shame.
Some indications for a role of dopamine in the feelings of shame are also provided by the fact that most situations during which shame is reported by PwP described OFF symptoms (see paragraph below “PwP reports of Shame”). In addition, during OFF period, patients can present with neuropsychiatric symptoms such as depression and anxiety  which may increase the perception or the proneness of shame. It has been shown that people suffering from depression are more likely to experience self-blaming emotions . However, when in their OFF state, patients experience more motor and nonmotor symptoms, many of which are embarrassing and difficult to deal with. It is then very difficult to disentangle causes from consequences and conclude that shame is an independent response to low levels of dopamine. Dopaminergic treatment leads to well-being, mood brightening, and increased alertness [42, 43]. The psychotropic effects of dopaminergic treatment can also induce impulse control disorders . In that case, PwP tend to feel less shame. When engaged in impulsive behaviors, PwP generally lack self-reflection that is necessary for feeling of shame. Patients with hyperdopaminergic behaviors, which range from positive creativity, benign excessive hobbyism, to behavioral addictions and punding  can have some lack of insight into the abnormal, repetitive, and excessive aspects of their behavior. Behavioral addictions demonstrate an excess bottom up dopaminergic drive and a decreased cortical top-down reflective control. It can lead to blindness towards the future consequences of one’s own actions [42, 46, 47]. This might be considered the exact opposite behavioral dimension compared to shame, where PwP become acutely and painfully aware of the consequences of their behaviors. However, breaking norms of society as a result of impulse control disorders, can go along with shame, but this seems related to the consequences of the behavior, rather than the behavior itself.
The hypothesis that shame could be increased during hypodopaminergic state is supported by the model proposed by Cloninger linking emotions and monoamine neurotransmitters (i.e., dopamine, serotonin and noradrenaline) . Dopamine has been involved in reward, motivation and reinforcement [49–52], whereas serotonin is believed to represent aspects such as self-confidence, inner strength and satisfaction and noradrenaline is involved in activation, vigilance and attention. Based on the hypothesis that these three monoamine systems represent different aspect of emotion, Lovheim took up Cloninger’s model and proposed a three-dimensional space where different levels of monoamines were jointly linked to particular emotional states (8 basic emotions and some self-conscious emotions) . Shame was placed in the corner where all three monoamines were low. The relation between shame and Parkinson’s disease, shame and depression [54–56], and shame and anxiety  support the decision to place shame in the low-dopaminergic, low-serotoninergic and low-noradrenergic side. Considering human motivated behaviour on a continuum of hypo-, normo- and hyperdopaminergic states is necessarily an oversimplification but it helps in the pharmacological management of PD with dopaminergic drugs. Other monoaminergic activating systems also interfere with behavior. The different neurotransmitters closely interact among themselves, which leads to a much higher complexity. It is important to also consider modulation of serotoninergic and noradrenergic systems [58, 59].
In conclusion, shame activates brain areas implicated in cognitive and emotion regulation and self-representation processes as well as brain areas implicated in the representation of the mental states of others. Its modulation by dopamine has not as yet been studied, but there is some evidence that dopamine could modulate this emotion to some extent. The question of shame being a primary non-motor symptom reflecting low levels of dopamine, or a feeling secondary to motor and non-motor PD symptoms remains unresolved. Further research is required to explore the role of dopamine in shame.
3.1Are persons with PD more prone to experience shame compared with patients with other chronic neurological diseases?
Whether shame is experienced more frequently in PD relative to other chronic conditions is understudied. Numerous factors influence the degree to which a condition is considered to be stigmatizing, such as whether the individual is viewed as responsible for the condition, the impact of the illness on others, and the outward appearance or competence changes associated with the condition.
The degree of embarrassment induced by tremor has been compared between PwP and persons with essential tremor . Essential tremor patients experienced more than three times the median number of waking hours experiencing tremor than PwP. More waking hours experiencing tremor was associated with higher degree of embarrassment. The stigma elicited by Alzheimer disease (AD) and PD in patients in the early to middle disease stages has been compared . Persons with AD and PD rated their perceived stigma in an equivalent way. However, internalized shame was rated higher in persons with AD than in the PD group. Social isolation was equivalent for both groups. Persons with AD were found to have higher levels of depression and lower self-esteem and personal control compared to the PD group. These findings suggest that a progressive neurological disease that primarily affects cognitive or mental capacity (e.g., AD) rather than physical ability as it is the case in PD may result in higher levels of perceived stigma and poorer outcomes, including a lower sense of personal control and feeling of shame. In another study comparing 5 neurological conditions, stigma was close among the different conditions, however slightly higher in people with amyotrophic lateral sclerosis compared with people with stroke, epilepsy, multiple sclerosis and PD .
In summary, PD does not seem to induce more embarrassment or stigmatization than other chronic neurological conditions. However, studies are scarce and this assumption needs to be confirmed.
PwP REPORTS OF SHAME
PwP experiences of shame reported in this article are based on the collection of PwP’s opinion on shame during PD support groups and informal interviews led by a psychologist (J.A.). It involved 44 patients of whom the duration of illness was 5 years and the age range was 60–75 years on average. The discussions were analyzed in details and the common themes were extracted. Shame reported by PwP arosed from different sources: 1) PD symptoms, especially visible motor symptoms but also non-motor symptoms, 2) The increasing physical dependence and need for help induced by PD, 3) The PwP assumption to break certain social rules and 4) The deteriorated body image.
4.1Shame arising from PD motor and non-motor symptoms
Shame lurks when hand tremor occurs in public, or causes spilling food or drink all over oneself or somebody else, earning appraisals by others that one is gross, ill mannered, deviant or worse. Shame also emerges when PwP gait becomes unsteady or when the way to speak is modified, with a recurrent mislabeling by non-medical people as drunkard. Shame can erupt from akinesia, at the checkout counter of a grocery store for example, when PwP struggle pulling out money or credit cards from her/his wallet, and feeling that customers in line show signs of impatience, or when micrographia turns hand writing into chicken scratch that no one can read, or when turning takes ages because of the 10 steps needed to perform a turn. The facial mask induced by PD is also a sensitive topic for PwP. Facial expression is essential for communication and facial masking can be misinterpreted as unfriendliness or simply odd. Shame can also arise from PD-induced dysarthria and hypophonia when PwP have to repeat what they have to say.
Non-motor symptoms can also cause shame. Drooling is one of the most reported symptoms, excessive salivation inducing a serious deteriorated body image and feelings of shame. PwP often avoid telling their relatives about hallucinations because they are worried being perceived as cognitively impaired and/or not being reliable anymore. The slowness of thinking and the difficulty to easily transmit thoughts can also cause shame. Sexuality disturbances can be a source of shame, not only in men who suffer from sexual incompetence but also in women who have been shown to be less satisfied with their sexual experiences compared with controls matched for age and marital status. Urinary problems such as urgencies are also symptoms involving embarrassment and sometimes shame.
4.2Shame arising from the increasing physical dependence and need for help
Shame is also associated with the progressive loss of independence. When asked to tell their stories, PwP describe feeling ashamed to have to hold on the arm of their companion to steady their walk, when getting assistance to sit down or getting up from a seat at a restaurant, or when a caregiver has to help tie shoelaces, dressing and undressing, or assisting with bodily functions. PwP may report feeling of shame towards their caregivers due to the increased request of special attention in the daily chores, such as in case of dysphagia for example which requires adaptation of the food consistency.
4.3Shame arising from PwP self judgement, that he/she has broken important social rules or norms and failed to comply with social expectations
PwP feel ashamed because they assume that they are breaking “rules of competence”, for example when they are in need of “someone else to cut their meat”, when “the words come out so awkwardly”, or when not being able to rise up from a chair on their own.
4.4Shame arises from PwP’s deteriorated body image
PD disrupts the image that PwP have of her/himself. PD symptoms as well as other people’s perceptions towards PD symptoms can cause feelings of shame because PwP feel that their body no longer represents who they are. PwP lose their experience of being an autonomous and respectful person. PwP can feel disconnected from themselves, because of this new undesirable self-image. The loss of self-efficacy can also be a source of shame especially when PwP are forced to leave their job and are not able to provide a decent salary to their family anymore. PwP also reports to be seen as frail and old by the others whereas they don’t feel that impaired.
4.5Frequency of PD-related shame
PwP argued that experiences of embarrassment were very common. Experiences of shame was however less common. Many PwP did not spontaneously discuss these experiences with their relatives or their neurologist because, ironically, they thought that it was considered embarrassing or shameful to talk about one’s embarrassment or the sources of one’s shame. Further studies will be needed to assess the precise frequency of PD-related shame.
4.6Comparison of PwP reports with the literature
There is a dramatic lack of specific references on PD-related shame. PD-related shame is indirectly addressed in articles dealing with “stigma” in PD [63, 64] or with psychosocial changes induced by PD [65–67]. Stigma in PD has been mostly studied by psychologists, nurses and sociologists via interviews . It is defined as a complex individual experience in which manifestations of PD and social environment interact to affect personal identity and, ultimately, sense of self which can result in feelings of shame . Concordant with the synthesis of our PwP’s interviews, stigma can arise from PD visible symptoms [63, 66, 69, 70], progressive loss of independence , communication problems  and others’ perceptions towards PwP. PwP can be seen as being frail or old by the others . Interestingly, PD is called “old age illness” in Swahili language due to the common knowledge that PD occurs mostly with older age . The sociologist Gerhardt Nijhof (1995), in a qualitative study relying on PwP’s life stories, observed that PD-related shame could arise from the fact that some PD symptoms make PwP break certain social rules . Not all rule-breaking behavior is said to be an explanation for shame. Three conditions are needed: 1) The social importance of the rules broken such as independence, competence and decency; 2) The visibility of the behavior. The shame arises from the visibility of the rule-breaking behavior because it is the public disclosure of social incompetence that is seen as causing shame. 3) The assumption of being labelled as a “deviant”. The PwP assumption can be strengthened by the behavior of ignorant people who misinterpret some of the PwP’s behavior as peculiar.
CONSEQUENCE OF RELATED SHAME ON PwP HEALTH-RELATED QUALITY OF LIFE
In our cohort, PwP reported that in their encounters with others, they felt disempowered because of their symptoms, negatively judged, embarrassed, shamed, and sometimes even humiliated. Most PwP rated these emotions as intense, particularly early in the disease process, when first learning to adjust to PD and the reactions that it generates in others. PwP may be subject to stigmatization because their parkinsonian symptoms make them look different. Parkinson’s UK, a charity association, found that 41% of PwP report experiencing discrimination because of having PD, including some experiences of misinterpretation of symptoms or verbal abuse in public . Socially imposed restrictions and stigma may contribute to psychological difficulties such as personal distress, self-identity alteration, depression and feelings of shame .
Overall, and as a way of warding off these painful emotions, as a way of defense, many PwP try to dissimulate their symptoms and/or avoid social encounters. This conducts to a reduction of activity and social engagement leading to social and emotional isolation. This mode of defense is a known pathway to severe depression and suicide, the most common risk factors for suicidal ideation being hopelessness, depression and social isolation . Chronic and intense levels of shame have been implicated in several psychiatric disorders such as depression  and anxiety . One of the PwP that we interviewed declared avoiding being in public on account of his spilling of food and drooling and unambiguously claimed, “I’d rather experience social isolation than social humiliation”. A study on suicide attempts in PD patients showed that pessimism, suicidal thoughts and worthlessness, where the items of the Beck Depression Inventory that correlated with suicide attempts . A feeling of worthlessness therefore is to be considered as a red flag. The painful and disruptive impact of shame on quality of life reported by PwP is further exacerbated by the fact that PwP don’t talk about this feeling because it is a taboo subject . Neurologists also rarely speak about it with patients maybe because of a mixture of lack of awareness, time and training.
MANAGEMENT OF SHAME
The distress generated by shame can be significantly consequential to the psychological wellbeing and quality of life of individuals with PD, their caregivers and families. A full array of cognitive-behavioral intervention strategies can bring relief. These include systematic desensitization, role playing, thought stopping, shame attacks, disputing the inner critic, identification of irrational thinking and dysfunctional cognitive schemas. One intervention model with a specific focus on shame is Paul Gilbert’s Compassion-Focused Therapy . This author asserts that individuals susceptible to feel ashamed are intensely self-critical, self-loathing and actively devalue themselves. They do not know how to access and activate self-compassion, which is the very antidote to harsh self-criticism and self-loathing. Compassion-Focused Therapy assists individuals to examine and replace their shame-based self-attacking with a healthier stance, namely, compassionate self-correction. The message is “to be kind to yourself”. Similarly, Brenne Brown  developed a psycho-educational group approach to combat shame. This approach teaches afflicted individuals the cognitive behavioral skills to become “shame resilient”, the ability to recognize shame and endure it constructively. This capacity is acquired through the establishment of empathic interconnections with others, becoming emotionally vulnerable and comfortable sharing shame experiences. Additionally, participants learn skills to recognize their shame triggers, practice critical awareness, let go of perfectionism, cease endless self-devaluation and unfair attributions of self-failure. They let go their need for certainty, overcome bouts of self-doubts, disengage from social comparisons, and of what they think people think about them which is often inaccurate. They learn to cultivate authenticity, gratitude, joy, optimism, tolerance for ambiguity and self-compassion. Brown’s reliance on resilience as strategy to prevent or preempt shame is well founded. Recent research on this construct points out that a key factor in resilience development is the acquisition of empowering inner resources and skills to face stressors before adversities happen .
The adjustment of dopaminergic replacement therapy to improve the feeling of shame has not been studied. It might however be efficient either directly or indirectly via improvement of anxiety and depression [83, 84]. Further investigations looking more specifically into changes in shame secondary to dopaminergic treatments are required. Serotonergic and noradrenergic treatments targeting comorbid depression might also be considered . Subthalamic deep brain stimulation (DBS) might also be help improving feeling of shame. Stigma is the individual subscore in quality of life that is improved with subthalamic DBS [85, 86]. Stigma secondary to visible signs of the disease such as motor fluctuations and dyskinesia is improved by DBS because DBS is the primary indication for motor fluctuations and dyskinesia. Although it needs further studies to prove it, it is possible that patients with higher proneness to shame and feelings of worthlessness are likely to ask for more aggressive treatments, accepting the risks of surgery.
Shame is an underrecognized symptom, rarely explored in clinical practice and in PD research. It emerges from PD motor and non-motor symptoms as well as from a self-perception of inadequacy due to increasing loss of autonomy and need for help, and from the deterioration of body image. Shame can have a significant negative impact on health-related quality of life. It may contribute to social isolation, depression and anxiety. PD-related shame overlaps with other psychiatric symptoms, such as depression and anxiety. Its neurobiology in PD remains unknown. We hypothesize that it could be modulated by dopamine but this assumption remains to be demonstrated. Shame should not be underestimated and should be actively explored by physicians. The strong relationships between shame and relevant outcomes (withdrawal behavior, anxiety, depression, low self-esteem, suicidal intent) and the heavy burden on quality of life support the need for further investigations of the manifestations of shame in PwP and the importance of developing effective interventions to reduce the impact of shame for PwP.
CONFLICT OF INTEREST
None of the authors have any conflicts of interest to disclose.
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