How people see and understand themselves is likely to have an impact on how they interpret interactions with others. Here, I briefly explore the brain areas implicated in anosognosia, how these areas are also relevant in psychopathy, and why anosognosia is important when considering the crime and the conscience.
ANOSOGNOSIA AND SELF BELIEF
Anosognosia is defined as the impaired ability of patients with neurological disorders to recognize the presence or adequately appreciate the severity of their deficits . Torrey (2012) cites three examples of anosognosic patients; a stroke victim with a paralyzed arm claimed he couldn’t lift it because he had a shirt on; a woman with paralysis in her left arm was asked to raise it, and instead raised her left leg. When this was pointed out to her she responded that some people call it an arm, others a leg, and jokingly inquired as to the difference; the Supreme Court Justice, William Douglas, was paralyzed on his left side. He claimed this was a myth, and was still inviting people to go hiking .
NEUROLOGICAL FINDINGS IN ANOSOGNOSIC PATIENTS
Recent research on this phenomenon has identified deficits in the brain of the patients who in all honesty do not recognize that they are in some way impaired. By using fluorodeoxyglucose positron emission tomography (FDG-PET) and single photon emission computed Tomography (SPECT) Perrotin et al. (2015) found that anosognosic Alzheimer’s patients had a disruption in connectivity between the posterior cingulate cortex (PCC) and the orbitofrontal cortex (OFC) . Ries et al. (2007) also implicated a compromised precuneus in anosognosic patients. These midline structures are susceptible to damage in those with Alzheimer’s Disease (AD) and stroke victims. Anosognosia is also experienced by schizophrenic patients; according to Gerretsen et al. (2015), 60% of schizophrenic patients experience moderate to severe illness awareness, and this can lead to medication non-adherence and poor treatment outcomes ; they found left hemispheric dominance in the left prefrontal cortex in anosognosic schizophrenic patients and cortical thinning in the temporoparietalocciptal junction (TPO).
There is still much work to be done to determine the mechanistic and functional basis of anosognosia, and to determine the subtleties between illnesses and disorders, but research is starting to identify suspect brain regions. This is useful if anosognosia is questioned in other disorders, because neurological studies exploring the disorder can be explored and legitimate avenues of scientific inquiry explored.
RESEARCH PARALLELS WITH PSYCHOPATHY
A failure to recognize a disorder is also present in those with psychopathy. While anosognosia is yet to be explored thoroughly in those with psychopathy, there are behavioral items on the Psychopathy Checklist (PCL-R)  that suggest anosognosia is present; grandiose sense of self-worth, lack of remorse, and failure to accept responsibility. The sense of self-worth and narcissistic traits of the psychopath clearly means that they think very highly of themselves. This negates the idea that the psychopath believes they suffer from a defect or a disorder; at the most they might recognize that most others are different, and perhaps inferior to themselves. If a lack of remorse is experienced, this is an explicit demonstration that they do recognize, at least on an emotional level, the consequences of their bad behavior as being wrong; if they do not believe their behavior is inappropriate, it stands to reason that they believe they behaved appropriately, and thus experience nothing ‘wrong’ about themselves. This aspect of self-belief and self-reflection is also seen in the psychopath’s failure to accept responsibility; if they are always good and right, there is little motivation to make amends.
Based upon this cursory examination of psychopathic behavior, it would seem reasonable to explore the neurological studies of psychopathy and see if there could be some overlap with previous studies on anosognosia, and in fact some of the same compromised brain areas are implicated. Many studies have demonstrated developmental differences in the PFC of the psychopath (for a review, see Umbach et al. (2015) ), and the white matter pathways, such as the uncinate fasciculus (UF) connecting to the PFC from the limbic regions . Perrotin et al.  hypothesized that Anosognosia can result from a disruption in connectivity in the UF. When exploring connectivity in the frontoparietal network (FPN), Philippi et al. (2015) found reduced connectivity in those with higher scores on the PCL-R, which included the right precuneus. And to further the overlap, Glenn et al. (2009)  found that those with who scored high on the interpersonal factors of the PCL-R (manipulative, conning, deceitful), showed reduced activity in the PCC during an fMRI scan when having to make judgments during moral dilemma scenarios.
Anosognosia and psychopathy both demonstrate complex neurological constructs, and it is premature to conclude that the neurological basis for Anosognosia (itself still understood) would tuck neatly into the already known neurological research on the psychopath. However, given the neat juxtaposition of behavioral traits and neurological dysfunction, it is worth bringing psychopathy into discussions of Anosognosia for the following reason. The research on psychopathy is currently deeper and richer than the research on anosognosia, and behavior of the psychopath has been widely observed and studied. If we can reasonably conclude that psychopaths, particularly criminal psychopaths, are also anosognosics, their behavior can be assessed in light of what it means to recognize no disorder or defect within oneself. The parallel is further relevant with psychopathy when considering that a number of those with schizophrenia, and a minority of those with AD, have been known for antisocial, and sometimes criminal, behavior [9, 10].
ANOSOGNOSIA, ANTISOCIAL BEHAVIOR, AND THE CONSCIENCE
Those with schizophrenia and AD also suffer from abuse, but when they have been known to act violently, their behavior and motivations need to be understood. Torrey (2012) has documented extensively the violent acts of those with schizophrenia . There is usually a history of progressively worse episodes of psychosis that can convince the patient that they are receiving supernatural or alien instructions to kill or harm individuals, and more often than not family members. Whether or not the auditory hallucinations slowly convince the patient over time of the necessity for deadly action, or whether the act is impulsive, after the event the patient often remains remorseless and attributes their behavior to necessary and mandated (often divine) reasons. This state of mind is similar to the violent psychopath, who also viewed his violent actions as necessary and fully justified. The problem is never attributed to the self; a disorder or defect is not recognized. While psychopaths are widely regarded as not having a conscience and experience only limited affect, more research is needed on the experience of conscience by schizophrenics, especially understanding the role that psychosis played in circumventing the conscience and providing them with permission to act. It is also crucial to discover how those events are remembered and felt post psychosis, perhaps when the patient has reconvened their medication.
In illnesses and disorders that can be associated with antisocial behavior or aggression, anosognosia could be a partial reason for the event of the behavior. Not recognizing any problems or defects, and thinking that one acted rightly or righteously, will affect personal judgments on the self-evaluation of behavior. This does not provide a fertile ground for remorse or responsibility, and if the behavior was aggressive, the patient could continue to remain dangerous, inflexible to a reasoned and peaceful behavioral change. This makes the search for the neural representation of anosognosia all the more crucial, treatment all the more pressing, and methods of identification all the more necessary.
© Jack Pemment, 2016
- Perrotin, A. et al. (2015). Anosognosia in Alzheimer disease: Disconnection between memory and self‐related brain networks. Annals of neurology, 78(3), 477-486
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- Lopez, O. L. et al. (2003). Psychiatric symptoms vary with the severity of dementia in probable Alzheimer’s disease. The Journal of neuropsychiatry and clinical neurosciences, 15, 346–353