What you describe happens in all the sciences.Anything can be interpreted several different ways. Doctors of the same medical specialty can have different opinions about a same event. So can two different medical examiners. So why should psych be any different? Anything is pretty much open to interpretation among experts-that's the nature of human and medical sciences.
A study of the human brain, its chemistry, and the persona are vital to people as plaintiffs or defendents. Jurors need to know why people act the way they do. It can be vital to explaining the actions of someone on either side, since the average lay person has little knowledge of such things. If REAL domestic abuse, child abuse, mental illness, or a host of other things play a major factor then someone who is an expert has to come in and explain to the jury how living through those things caused a plaintiff or defendent to act in xyz way.
There is nothing wrong with each side hiring an independent person to look at evidence and present their opinion. You can be fairly objective as a psychologist...Demarte is just one of many I have seen over the years who have done just that. Again, just because the other side hires someone who gives a diff opinion does not mean psychology is useless. Courts do it with medical experts as well, blood spatter experts, etc.
Where the murkiness comes in is when ones like Samuels and ALV, or Henry Lee the ME...those who cannot be objective, who are paid to testify a certain way instead of being objective. Those who blur the pt/professional boundaries. That happens in other fields besides psych as well (Lee case in point). Those people are ones that that shouldn't be around giving so-called expert testimony. True professionals don't do that; that is not what is supposed to be done.
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I agree that neuropsychology brings much factual evidence into the brain of the suspect on trial. If there is brain damage consistent with the behavior that caused their incarceration, I find that significant.
Interesting enough, scientists have studied the brains of psychopaths and every single one had damage in their prefrontal cortex. You physically could notice upon comparing the ASPDs brains to a healthy brain that there was significant compression/absence of certain parts of the cerebral cortex. Where that damage was on the cortex varies specifically with each psychopath - essentially causing them all to have the same core personality issue but different specific mechanisms/ways in which those behaviors are manifested.
Also MAOA which regulates serotonin is carried by the X chromosome axis so males are more likely to inherit psychopathy (from their mothers) as typically they lack they amount of MAOA necessary bc of their male sex chromosomes.
Also, all psychopaths studied had an over abundance Of serotonin via the mother in utero can cause the baby to become infiltrated and overly tolerant of serotonin later in their brain development.
James Fallon, Ph.D. is a highly decorated neuroscientist and Professor Emeritus of Anatomy and Neurobiology at University of California, Irvine. Dr. Fallon has several areas of expertise. One is adult stem cells. Another is psychiatry. Specifically, he is interested in the relationships between brain imaging (he has served as Director of UC Irvine’s Human Brain Imaging Center), genetics and various psychiatric conditions, including schizophrenia, depression and addictions.
An Extraordinary Experiment
Aware of his specialties, for many years, Fallon’s colleagues have sent him brain images they wished to have him analyze.
At one point this interchange took the form of an experiment.
Colleagues sent him 70 MRI scans of brains belonging to people ranging from healthy to mentally ill. Included in the batch were scans of brains belonging to killers, including some notorious ones. But Fallon had no idea which scanned brain belonged to whom.
Nonetheless, he was able to identify differences in five of the scans so dramatic that he could recognize them as the markers of psychopathy. And it turned out that he was correct. The five scans on which he zeroed in actually were those from the brains of psychopathic serial killers.
Signs of the Psychopath’s Brain
How could Fallon distinguish the serial killers’ brain scans from the others? He says that all five had some tell-tale signs:
A lack of activity in the orbital cortex, the brain area just above the eyes, which he says is in the circuit coding for ethics, conscience and impulse control
A lack of activity in the anterior part of the temporal cortex, where we find the amygdala, a structure deeply involved in processing emotion
Underfunctioning in the narrow strip of limbic cortices that connect the orbital cortex with the amygdala, namely:
The cingulate cortex, which codes for social cues
The hippocampal area, which, along with the amygdala, codes for emotional memories
The insula, which processes empathy and “gut feelings”
This makes sense. These areas are considered part of the limbic system, the brain complex primarily responsible for our emotional lives. When these areas are underactive or inactive, a person might feel driven – like many killers – to compensate by repeatedly pursuing extreme activities simply to feel satisfied and alive.
Violence-Related Genes
In addition to his study of killers’ brains, Fallon has also studied the genetics of aggression and violence.
Psychological traits are affected by multiple genes. And Fallon says that perhaps a dozen have been identified as high-risk, violence-related genes. These include genes affecting dopamine and norepinephrine neurotransmission and androgen (testosterone) receptors.
The most well-known of these violence-related genes is a particular version of the Monoamine Oxidase A (MAOA) gene. Because it was the first such gene discovered, it was labeled, and has become popularly known as, “the Warrior Gene,” although Fallon stresses that this nickname can be misleading since all of the various genes associated with violence and aggression could be considered, in a sense, warrior genes.
Most humans have an MAOA gene and it helps regulate serotonin, a neurotransmitter that Fallon says helps relax and calm us. But those with the “Warrior Gene” form of it receive too much serotonin during development in utero, which desensitizes the brain to its effects. That means that later in life, when serotonin would otherwise inhibit behavior, it is unable to do so, resulting in impulsivity and violence.
The MAOA gene is on the X chromosome. This has important implications for how its effects express themselves in males vs. females. Girls get an X chromosome from both their mother and father, so even if one parent passes along the “Warrior Gene” variant, they are likely to get a normally functional MAOA variant from the other parent that offsets its potentially dangerous consequences. But boys get only one X chromosome – the one passed down from their mother. If that X chromosome has the “Warrior” version of the MAOA gene, that will be the only version of it that the boy receives.
This means that violence related to the MAOA “Warrior Gene” is usually passed genetically from mother to son. Fallon believes it also explains why boys and men are much more likely to be very aggressive or psychopathic killers.
Moreover, Fallon says that the reduced empathy seen in psychopathy may be associated with the influence of low acting genes related to the hormones oxytocin and vasopressin.
Can Biology Alone Create a Psychopath?
So, putting this together, Fallon recognized patterns in both the brains and genetics of psychopathic killers.
Loss of function in the orbital cortex, anterior temporal lobes and the strip of limbic cortices connecting the two
Having one or more of several high-risk, violence-related genes (like the so-called “Warrior Gene”

But a crucial question remained. Are these biological markers alone enough to create a psychopath?
http://www.ponerologynews.com/neuroscientist-james-fallon-how-psychopathic-killers-made-prevented/