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After Braunstein was returned to New York for trial, his defense never contested that he had committed the assault. Instead, defense experts painted a picture of a man whose downward drift into what was characterized as paranoid schizophrenia had aborted a successful career as a writer for Women's Wear Daily and other publications 2.

Rather than the expected insanity defense, however, Braunstein's not-guilty plea was based on the contention that he was unable to form an intent to commit the crimes with which he was charged. The definitions of most crimes require that a defendant be found both to have committed the act in question and to have done so with intent—denoted by the Latin term mens rea, or guilty mind—to commit that specific act. In contrast, Braunstein's attorney characterized his behavior as having been committed "in a vague, improvisational haze, a kind of fantasy, never knowing what he was going to do from one moment to the next" 3.

Although not every state allows mental health experts to testify with regard to a defendant's ability to form the required intent to commit a crime 4 , New York is one of the jurisdictions that does. Braunstein's claim, moreover, was based on more than just the data gathered in clinical interviews.

Monte Buchsbaum, a psychiatrist who specializes in the use of positron emission tomography PET scans, was called to the stand to introduce evidence that Braunstein had decreased function in his frontal lobes, which he described as the part of the brain that controls initiation and cessation of behavior, planning, and moral judgment. The Braunstein case is illustrative of the problems that exist with the use of evidence that is based on functional scans of the brain.

The use of a PET scan to support Braunstein's claim that he could not form an intent to commit the crimes with which he was charged is one of the more dramatic examples of the entry of functional brain scanning into the courts. But it was by no means the first time brain scans have played a prominent role at trial.

Many Americans first became aware of structural brain scanning technology when a defense expert introduced computerized axial tomography CAT scans of John W. Hinckley's brain to support the contention that Hinckley—being tried for the attempted assassination of President Ronald Reagan—suffered from schizophrenia 6. The development of functional scanning, including PET, single-photon emission computed tomography SPECT , and most recently, functional magnetic resonance imaging fMRI , have multiplied the forensic uses of brain scanning technology. Underlying all types of functional scanning evidence is the assumption that disruptions in the function of discrete parts of the brain can lead to alterations in particular aspects of cognition and behavior.

The classic 19th century case of Phineas Gage, the railroad worker who suffered a dramatic change in his personality after an iron tamping bar was shot through the front of his brain, is often used to illustrate the phenomenon 7. Gage, a hard-working family man, became an impulsive, mildly antisocial ne'er-do-well in the wake of his accident, a change attributed to damage to his prefrontal cortex, often considered the brain's locus for reasoning, planning, impulse control, and moral judgment.

Other brain areas linked to legally relevant functions include the amygdala involved in control of emotions, including anger and the anterior cingulate cortex which plays a role in the generation of empathy 8. Scanning techniques are based on the presumption that changes in blood flow—the parameter actually measured by the technology—correspond to changes in neural activity. Functional neuroimaging evidence has been used in criminal cases in support of the insanity defense 9 , claims of incompetence to stand trial 10 , and pleas for mitigation in sentencing—a use pioneered by Dr.

Buchsbaum Civil cases in which functional imaging has been introduced typically involve claims of brain injury as a result of defendants' activities 12 but include more esoteric uses as well, such as to establish the effect of violent video games on children Because only a fraction of legal cases yield written opinions, and given the greater ease and finer resolution of fMRI imaging compared with PET and SPECT, the number of cases involving functional neuroimaging by now is undoubtedly at least several times higher.

But the courts' receptivity to functional imaging evidence has not gone unchallenged. From a scientific perspective, there are a number of conceptual issues in relating imaging findings to particular cognitive functions for example, to impulse control or planning , including the assumption that complex functions are localized to single areas of the brain Not only do current models suggest that higher-level brain functions typically are dependent on interactions among a distributed web of neural centers, but the ability of other brain regions to take over from injured areas suggests limits to the conclusions that can be drawn from localized deficits.

Moreover, to the extent that data link reduced activity in a particular brain region to a pattern of impaired cognition or behavior, the findings are almost always based on correlations between aggregate data and outcome measures, which can obscure the extent of individual differences.

Thus a range of functional levels could be compatible with unimpaired cognition and behavior, including some that may be significantly different from the statistical mean How functional scanning results are presented can also be problematic. Levels of activation are determined by subtracting resting levels of activity from those achieved when the brain is being challenged to perform a particular task. Thus, when a bright patch of color fails to appear in a brain region of interest, the finding does not signify that the region was inactive, only that it was not significantly more active in response to the stimulus than in its absence In theory, a person who is more efficient than the average subject at performing a particular task may show results that falsely suggest a failure to activate the relevant region.

And the levels at which a significant difference is identified—perhaps not much above baseline—and the colors used to illustrate it are often selected arbitrarily.

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Thus dramatic contrasts on a scan can reflect relatively minor differences in actual levels of brain activity. In the courtroom setting, however, perhaps the most important limitation on the current use of functional imaging evidence is the discrepancy between the inferences that can be drawn and the legal standards to be met. To be found not guilty by reason of insanity, for example, a defendant must demonstrate in one common formulation that he "lack[ed] substantial capacity either to appreciate the wrongfulness of his conduct or to conform his conduct to the requirements of the law.

Hence, there is an understandable resistance among legal and neuroscience experts to accepting neuroimaging data as evidence of "aberrations in human thought, will, motivation or propensity for culpable behavior, or to show an incapacity to inhibit … behavior" To behave otherwise, in one commentator's caustic turn of phrase, would be to exhibit symptoms of "brain overclaim syndrome," a condition that threatens to undermine the integrity of the process of determining responsibility for criminal acts Peter Braunstein's trial on charges of kidnapping, sexual abuse, burglary, robbery, and arson turned out to be a case in point.

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Deliberating only four hours before finding the defendant guilty on all charges except arson, the jury appeared to accept the conclusion of the prosecutor that "It really was an indefensible defense. All the actions, the record, his writings, his interviews were very clear. All the events leading up to it, the preparation for the crime, the actual execution of the crime, his getaway. It was a really conscious effort on his part to commit this crime" Whatever the PET scans of Braunstein's frontal lobes showed, the jury was unwilling to accept that his deficits rendered him "completely unable to plan," which a finding of lack of intent would have required.

The commonsense view that the crime was too intricate to have been carried out by someone incapable of forming a criminal intent won the day. What is the likely future of neuroimaging evidence in court? As noted, functional scanning already appears to be playing a useful role in demonstrating impairments that result from physical injury, including exposure to toxins. In addition, in some cases where gross lesions are present and a person's behavior showed clear changes after the lesion developed 8 , imaging data may be helpful in identifying the cause of the deviant actions, although structural imaging is more likely than functional imaging techniques to be used for this purpose.

Moreover, to the extent that convincing data can be generated to demonstrate strong associations between specific deficits on scanning paradigms and relevant mental functions for example, impulse control , such data could be used to support defendants' claims of absent or diminished responsibility. But without evidence drawn from defendants' own behavior and clinical state, functional scanning data are not likely to stand on their own for such purposes.

It remains too early to judge whether neuroimaging evidence will become anything more than "a high-tech crystal ball" Appelbaum, who is editor of this column, is the Elizabeth K. Gamification artifacts and crowdsourcing participation: Examining the mediating role of intrinsic motivations. Cloud computing in manufacturing: The next industrial revolution in Malaysia? Understanding the role of interpersonal identification in online review evaluation: An information processing perspective. An empirical investigation on knowledge use in virtual communities—A relationship development perspective.

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Understanding knowledge contribution in online knowledge communities: A model of community support and forum leader support. Integrating social networking support for dyadic knowledge exchange: A study in a virtual community of practice. The roles of psychological climate, information management capabilities, and IT support on knowledge-sharing: an MOA perspective. They Said What? A system dynamics approach to increasing user participation in a blog-based online social network. A model for consumer knowledge contribution behavior: the roles of host firm management practices, technology effectiveness, and social capital.

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Determinants of knowledge seeking in professional virtual communities. Elements of the management of norms and their effects on the sense of virtual community. How credibility affects eWOM reading: The influences of expertise, trustworthiness, and similarity on utilitarian and social functions. Innovation without me: why employees do not participate in organizational innovation communities. An investigation of information sharing and seeking behaviors in online investment communities. Identification vs.

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Trust, empathy, social identity, and contribution of knowledge within patient online communities. Effects of technical and social design on virtual community identification: a comparison approach. How individuals choose topics to contribute at an online context. Understanding the continuance intention of knowledge sharing in online communities of practice through the post-knowledge-sharing evaluation processes.

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Gray , Brian S. Butler ,. Antecedents of an experienced sense of virtual community. Knowledge Collaboration in Online Communities. Samer Faraj , Sirkka L. Jarvenpaa , Ann Majchrzak ,. Examining knowledge contribution from the perspective of an online identity in blogging communities. Social motivations to pay for services: lessons from virtual communities. Motivations for Social Computing. A robust fuzzy trajectory estimation design of high speed reentry vehicles.

Integrating online and offline community through facebook. Network Structures and Online Technology Adoption. Enterprise Information Portals in support of business process, design teams and collaborative commerce performance. Virtual community influence consumer purchase decision research. Understanding knowledge sharing in virtual communities. Helpful to you is useful to me: The use and interpretation of social voting. Social capital and individual motivations on knowledge sharing: Participant involvement as a moderator. Business Process Management beyond Boundaries? Sirkka L. Why do members contribute knowledge to online communities?

Image and video disclosure of substance use on social media websites. Manufacturing Firms. Social Identity in Facebook Community Life. Knowledge contribution in virtual communities: accounting for multiple dimensions of social presence through social identity. To give or to receive? The emancipatory role of information and communication technology. Examining identity and organizational citizenship behaviour in computer-mediated communication. Exploring factors that influence knowledge sharing behavior via weblogs.

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