Farah, Martha J
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Publication Minds, Motherboards, and Money: Futurism and Realism in the Neuroethics of BCI Technologies(2014-05-15) Attiah, Mark A; Farah, Martha JFrom the Introduction: Brain computer interfaces (BCIs) are systems that enable the brain to send and receive information to and from a computer, bypassing the body's own efferent and afferent pathways. BCIs have been used in experimental animal models to augment perception, motor control and even memory (Velliste et al., 2008; Berger et al., 2011; Torab et al., 2011). Human BCIs include cochlear implants and a host of experimental devices including retinal implants (Niparko et al., 2010; Klauke et al., 2011). BCI technology holds the potential to benefit humanity greatly, but also the potential to do harm, and its ethical implications have therefore been addressed by a number of commentators.Publication That Little Matter of Consciousness(2008-09-05) Farah, Martha J.Publication Mind, Brain, and Education in Socioeconomic Context(2009-11-11) Farah, Martha J.Publication When we enhance cognition with Adderall, do we sacrifice creativity? A preliminary study(2008-11-15) Farah, Martha J.Rationale: Adderall (mixed amphetamine salts) is used by healthy normal individuals to enhance attention. Research with healthy normal participants and those with attention deficit hyperactivity disorder indicate a possible inverse relationship between attentional function and creativity. This raises the possibility that Adderall could decrease creativity in people using it for cognitive enhancement. Objective: This study was designed to find out whether Adderall impairs creativity in healthy young adults. Material and methods: In a double-blind placebo-controlled study, the effects of Adderall on the performance of 16 healthy young adults were measured on four tests of creativity from the psychological literature: two tasks requiring divergent thought and two requiring convergent thought. Results: Adderall affected performance on the convergent tasks only, in one case enhancing it, particularly for lower performing individuals, and in the other case enhancing it for the lower-performing and impairing it for higher-performing individuals. Conclusion: The preliminary evidence is inconsistent with the hypothesis that Adderall has an overall negative effect on creativity. Its effects on divergent creative thought cannot be inferred with confidence from this study because of the ambiguity of null results. Its effects on convergent creative thought appear to be dependent on the baseline creativity of the individual. Those in the higher range of the normal distribution may be unaffected or impaired, whereas those in the lower range of the normal distribution experience enhancement.Publication Does Transcranial Direct Current Stimulation Improve Healthy Working Memory?: A Meta-Analytic Review(2016-08-01) Mancuso, Lauren E.; Hamilton, Roy; Ilieva, Irena P.; Farah, Martha J.Transcranial direct current stimulation (tDCS) has been reported to improve working memory (WM) performance in healthy individuals, suggesting its value as a means of cognitive enhancement. However, recent meta-analyses concluded that tDCS has little or no effect on WM in healthy participants. In this article, we review reasons why these meta-analyses may have underestimated the effect of tDCS on WM and report a more comprehensive and arguably more sensitive meta-analysis. Consistent with our interest in enhancement, we focused on anodal stimulation. Thirty-one articles matched inclusion criteria and were included in four primary meta-analyses assessing the WM effects of anodal stimulation over the left and right dorsolateral pFC (DLPFC) and right parietal lobe as well as left DLPFC stimulation coupled with WM training. These analyses revealed a small but significant effect of left DLPFC stimulation coupled with WM training. Left DLPFC stimulation alone also enhanced WM performance, but the effect was reduced to nonsignificance after correction for publication bias. No other effects were significant, including a variety of tested moderators. Additional meta-analyses were undertaken with study selection criteria based on previous meta-analyses, to reassess the findings from these studies using the analytic methods of this study. These analyses revealed a mix of significant and nonsignificant small effects. We conclude that the primary WM enhancement potential of tDCS probably lies in its use during training.Publication Are Prescription Stimulants “Smart Pills”?(2011-09-01) Smith, M. Elizabeth; Farah, Martha JUse of prescription stimulants by normal healthy individuals to enhance cognition is said to be on the rise. Who is using these medications for cognitive enhancement, and how prevalent is this practice? Do prescription stimulants in fact enhance cognition for normal healthy people? We review the epidemiological and cognitive neuroscience literatures in search of answers to these questions. Epidemiological issues addressed include the prevalence of nonmedical stimulant use, user demographics, methods by which users obtain prescription stimulants, and motivations for use. Cognitive neuroscience issues addressed include the effects of prescription stimulants on learning and executive function, as well as the task and individual variables associated with these effects. Little is known about the prevalence of prescription stimulant use for cognitive enhancement outside of student populations. Among college students, estimates of use vary widely but, taken together, suggest that the practice is commonplace. The cognitive effects of stimulants on normal healthy people cannot yet be characterized definitively, despite the volume of research that has been carried out on these issues. Published evidence suggests that declarative memory can be improved by stimulants, with some evidence consistent with enhanced consolidation of memories. Effects on the executive functions of working memory and cognitive control are less reliable but have been found for at least some individuals on some tasks. In closing, we enumerate the many outstanding questions that remain to be addressed by future research and also identify obstacles facing this research.Publication Personhood and neuroscience: Naturalizing or nihilating?(2007-01-01) Farah, Martha J.; Heberlein, Andrea SPersonhood is a foundational concept in ethics, yet defining criteria have been elusive. In this article we summarize attempts to define personhood in psychological and neurological terms and conclude that none manage to be both specific and non-arbitrary. We propose that this is because the concept does not correspond to any real category of objects in the world. Rather, it is the product of an evolved brain system that develops innately and projects itself automatically and irrepressibly onto the world whenever triggered by stimulus features such as a human-like face, body, or contingent patterns of behavior. We review the evidence for the existence of an autonomous person network in the brain and discuss its implications for the field of ethics and for the implicit morality of everyday behavior.Publication The Puzzle of Neuroimaging and Psychiatric Diagnosis: Technology and Nosology in an Evolving Discipline(2012-10-08) Farah, Martha J; Gillihan, Seth JBrain imaging provides ever more sensitive measures of structure and function relevant to human psychology and has revealed correlates for virtually every psychiatric disorder. Yet it plays no accepted role in psychiatric diagnosis beyond ruling out medical factors such as tumors or traumatic brain injuries. Why is brain imaging not used in the diagnosis of primary psychiatric disorders, such as depression, bipolar disease, schizophrenia, and attention-deficit hyperactivity disorder (ADHD)? This article addresses this question. It reviews the state of the art in psychiatric imaging, including diagnostic and other applications, and explains the nonutility of diagnostic imaging in terms of aspects of both the current state of imaging and the current nature of psychiatric nosology. The likely future path by which imaging-based diagnoses will be incorporated into psychiatry is also discussed. By reviewing one well-known attempt to use SPECT scanning in psychiatric diagnosis, the article examines a real-world practice that illustrates several related points: the appeal of the idea of image-assisted diagnosis for physicians, patients and families, despite a lack of proven effectiveness, and the mismatch between the categories and dimensions of current nosology and those suggested by imaging.Publication The Neuroscience of Socioeconomic Status: Correlates, Causes, and Consequences(2017-09-27) Farah, Martha JNeuroscience research on socioeconomic status (SES) has begun to characterize aspects of brain structure and function that vary with SES. This review summarizes our current state of knowledge concerning the neural correlates of SES, their likely consequences for human psychology and possible causes of these correlates, including relevant evidence from human and animal research concerning these causes. Challenges of research on the neuroscience of SES are discussed, and the relevance of this topic to neuroscience more generally is considered.Publication Broadening the Focus(2014-04-01) Shriver, Adam; Buller, Tom; Farah, Martha JOver the past dozen or so years neuroethics has become a rich and dynamic field that has brought together individuals from a variety of disciplines and interests to consider issues that lie at the intersection of ethics and neuroscience. During this period there has been a significant amount of important empirical and philosophical work on a range of topics at this intersection; however, there has been comparatively little work on this intersection as it applies to nonhuman animals. In fact, it is fair to say that neuroethics has had a distinct and almost exclusive “humanistic focus.” Our hope with this special section is to broaden this focus and to provoke and encourage discussion of nonhuman animals within neuroethics. There are a number of explanations for neuroethics’ humanistic focus.