The Law and Neuroscience Blog

MAOA and Criminal Responsibility

Matthew Baum has a new piece in Neuroethics entitled, "The MAOA Predisposition to Impulsive Violence: Is it Relevant to Criminal Trials?"  

Here is the abstract:

In Italy, a judge reduced the sentence of a defendant by 1 year in response to evidence for a genetic predisposition to violence. The best characterized of these genetic differences, those in the monoamine oxidase A (MAOA), were cited as especially relevant. Several months previously in the USA, MAOA data contributed to a jury reducing charges from 1st degree murder (a capital offence) to voluntary manslaughter. Is there a rational basis for this type of use of MAOA evidence in criminal court? This paper will review in context recent work on the MAOA gene–environment interaction in predisposing individuals to violence and address the relevance of such findings to murder trials. Interestingly, the MAOA genetic variants impact future violence and aggression only when combined with the adverse environmental stimuli of childhood maltreatment. Thus nature and nurture interact to determine the individual’s risk. Based on current evidence, I argue there is a weak case for mitigation. But should future experiments confirm the hypothesis that individual differences in impulse control and response to provocation found in MAOA-L men (without abuse) are significantly magnified when combined with childhood maltreatment, the case could turn into a stronger one.

 

Neuroprediction, Violence, and the Law

I have a forthcoming paper with Stephanos Bibas, Scott Grafton, Kent Kiehl, Andrew Mansfield, Walter Sinnott-Armstrong, and Michael Gazzaniga entitled "Neuroprediction, Violence, and the Law: Setting the Stage," that is available as an "on-line first" draft on Neuroethics. 

Here is the abstract:

In this paper, our goal is to (a) survey some of the legal contexts within which violence risk assessment already plays a prominent role, (b) explore whether developments in neuroscience could potentially be used to improve our ability to predict violence, and (c) discuss whether neuropredictive models of violence create any unique legal or moral problems above and beyond the well worn problems already associated with prediction more generally. In “Violence Risk Assessment and the Law”, we briefly examine the role currently played by predictions of violence in three high stakes legal contexts: capital sentencing (“Violence Risk Assessment and Capital Sentencing”), civil commitment hearings (“Violence Risk Assessment and Civil Commitment”), and “sexual predator” statutes (“Violence Risk Assessment and Sexual Predator Statutes”). In “Clinical vs. Actuarial Violence Risk Assessment”, we briefly examine the distinction between traditional clinical methods of predicting violence and more recently developed actuarial methods, exemplified by the Classification of Violence Risk (COVR) software created by John Monahan and colleagues as part of the MacArthur Study of Mental Disorder and Violence [1]. In “The Neural Correlates of Psychopathy”, we explore what neuroscience currently tells us about the neural correlates of violence, using the recent neuroscientific research on psychopathy as our focus. We also discuss some recent advances in both data collection (“Cutting-Edge Data Collection: Genetically Informed Neuroimaging”) and data analysis (“Cutting-Edge Data Analysis: Pattern Classification”) that we believe will play an important role when it comes to future neuroscientific research on violence. In “The Potential Promise of Neuroprediction”, we discuss whether neuroscience could potentially be used to improve our ability to predict future violence. Finally, in “The Potential Perils of Neuroprediction”, we explore some potential evidentiary (“Evidentiary Issues”), constitutional (“Constitutional Issues”), and moral (“Moral Issues”) issues that may arise in the context of the neuroprediction of violence.

 

The Neurobiology of Evil

Big Think has posted a recent interview with Michael Stone entitled "The Neurobiology of Evil."  If you haven't checked out Big Think before, you should also watch some of their other fascinating interviews with folks like Kwame Appiah, Antonio Damasio, Joseph LeDoux, Alfred Mele, and others.

Kiehl, Morse, and Others on Psychopathy and the Law

Radio Health Journal has a series of interesting interviews with Kent Kiehl, Stephen Morse, and others concerning psychopathy, neuroscience, and the law.  Go here to listen to the recording (beginning at the 2 minute mark).

Neurolaw in the News

Neuroscience has taken center stage in two recent criminal court cases--one in Italy, the other in Chicago, IL.  In the former case, a convicted murderer got a reduced sentence based on evidence concerning his low activity MAOA (see here for a brief discussion about MAOA).  The case was discussed recently in Nature News.  Here is an excerpt:

An Italian court has cut the sentence given to a convicted murderer by a year because he has genes linked to violent behaviour — the first time that behavioural genetics has affected a sentence passed by a European court. But researchers contacted by Nature have questioned whether the decision was based on sound science.

Abdelmalek Bayout, an Algerian citizen who has lived in Italy since 1993, admitted in 2007 to stabbing and killing Walter Felipe Novoa Perez on 10 March. Perez, a Colombian living in Italy, had, according to Bayout's testimony, insulted him over the kohl eye make-up the Algerian was wearing. Bayout, a Muslim, claims he wore the make-up for religious reasons.

During the trial, Bayout's lawyer, Tania Cattarossi, asked the court to take into account that her client may have been mentally ill at the time of the murder. After considering three psychiatric reports, the judge, Paolo Alessio Vernì, partially agreed that Bayout's psychiatric illness was a mitigating factor and sentenced him to 9 years and 2 months in prison — around three years less than Bayout would have received had he been deemed to be of sound mind.

But at an appeal hearing in May this year, Pier Valerio Reinotti, a judge of the Court of Appeal in Trieste, asked forensic scientists for a new independent psychiatric report to decide whether he should commute the sentence further.

The Secret Politics of the Compatibilist Criminal Law

I recently stumbled upon a really provocative paper by Anders Kaye entitled, "The Secret Politics of the Compatibilist Criminal Law." Given that one of the key issues addressed in  the paper is whether compatibilist theories of free will--which focus very heavily on dispositional traits and conscious mental states--can accommodate situational forces that are criminogenic (e.g., poverty and early childhood abuse).  According to Kaye, compatibilist theories of free will and responsibility have been used by some criminal theorists to shield the criminal law from developments in behavioral science, criminology, etc. that might otherwise lead to a less punitive justice system as well as a more egalitarian society.  In short, Kaye suggests that compatibilism is not a "politically innocent" theory of free will.  Here is the abstract:

Many criminal theorists say that we have a 'compatibilist' criminal law, by which they mean that in our criminal law a person can deserve punishment for her acts even if she does not have 'genuinely' free will. This conception of the criminal law harbors and is driven by a secret politics, one that resists social change and idealizes the existing social order. In this Article, I map this secret politics. In so doing, I call into question the descriptive accuracy of the compatibilist account of the criminal law, and set the stage for a franker discussion of criminal punishment - one that recognizes that the perpetual struggle to say just who 'deserves' punishment is driven as much by brute politics and the competition to allocate power and resources in society as by any independent moral logic.

There is already a heated debate about Kaye's novel line of reasoning over at The Garden of Forking Paths.  However, it would be nice to see an active comment thread here at The Law and Neuroscience Blog as well.  So, please take a look at the paper and then give us your thoughts!

The New Neuromorality

A hat-tip to Tom Clark for bringing this exciting pod-cast to my attention.  It turns out the American Enterprise Institute hosted a conference back in 2005 entitled The New Neuromorality, which had an all-star cast of speakers including LANP fellows Martha Farrah, Josh Greene, Hank Greely, and Stephen Morse as well as other scholars such as Steven Pinker and Philip Tetlock.  Needless to say, the 5+ hours of talks by some of the leading researchers from psychology, philosophy, and the law are both interesting and illuminating.

Brains Gone Awry

Here are three recent stories from Science Daily that readers should check out:

1. Scientists identify some of the genetic underpinnings of schizophrenia and bi-polar disorder.
2. Brain mapping appears to provide scientists with advanced warnings concerning mental illness.
3. Researchers are using brain imaging to better understand the biology of psychopathy.

While you're at it, here are two more worth reading:

1. Over at BRAINETHICS, there is a write up of the latest response to the now infamous "voodoo correlations" criticism of fMRI research that was recently put forward by Vu et al.
2. Over at Neurophilosophy, there is a short write up about the daguerreotype of Phineas Gage that was recently discovered.