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The Neuropsychology of Schizophrenia Circa 2009 Neuropsychol Rev (2009) 19:277–279 DOI 10.1007/s11065-009-9112-3 EDITORIAL The Neuropsychology of Schizophrenia Circa 2009 Robert M. Bilder Received: 24 July 2009 /Accepted: 29 July 2009 /Published online: 13 August 2009 # The Author(s) 2009. This article is published with open access at Springerlink.com Keywords Neuropsychology. Cognitive neuroscience . be considered surprising … One fairly popular Genetics . Informatics . Neuroimaging . Phenomics . explanation … is that … motivational deficiencies Schizophrenia and thought disorders are responsible … the implica- tion is that these deficits are functional in nature. This explanation cannot be ruled out on the basis of The last 30 years have been marked by the emergence of currently available evidence, but it can be questioned” transformative technologies for the study of brain structure- (page 156); and “[it is likely that] chronic schizo- function relations, and these have been deployed vigorously phrenics will appear organic on neuropsychological to help unravel the mysterious causes for, and treatments testing because a significant proportion of them are for the schizophrenia syndrome. Despite the progress, the organic” (page 157). ultimate goal—to identify a “smoking gun,” in the form of These prescient (and diplomatic) statements signal what a cognitive, a functional anatomical or a genetic signature was then a prevalent dualistic perspective, the echoes of responsible for the brain pathology underlying schizophre- which are now only faint. For example, one may note that nia—remains elusive. This collection of articles from global the term “organic” was effectively scrubbed from the leaders in neuropsychological research on schizophrenia DSM-IV, contrasting to its conspicuous presence in the makes poignant how much our thinking has changed over DSM-III. If the 21st century is one day seen as marking the last three decades, but also that we still have more the death of dualism in psychiatric taxonomies, this may questions than answers about the fundamental neurobio- be considered a victory for neuropsychology, neuroimag- logical underpinnings of schizophrenia. ing (which provided compelling evidence of structural To put the progress in perspective, we may recall the brain anomalies (Johnstone et al. 1976)), and genetics conclusions of Heaton et al. (1978), following their (confirming heritability of ~80% for the schizophrenia incisive review of neuropsychological studies of psychiatric syndrome). Whatever the driving forces, it is now com- disorders: monplace to seek biological explanations for both the “The finding that chronic or process schizophrenics causes and treatments of schizophrenia, and this reflects a look like organics on neuropsychological tests might sea change in thinking for which neuropsychology can claim significant credit. The reviews in this issue offer snapshots from multiple perspectives embraced in 21st century research on the R. M. Bilder (*) neuropsychology of schizophrenia. These papers show that Department of Psychiatry & Biobehavioral Sciences, neuropsychology has become central to the study of both David Geffen School of Medicine, Department of Psychology, College of Letters and Science, and Semel Institute for the causes and treatments of schizophrenia. Neuroscience & Human Behavior, UCLA, & Los Angeles, CA, USA Palmer, Dawes, and Heaton offer a broad historical e-mail: [email protected] view, highlighting the role neuropsychological research 278 Neuropsychol Rev (2009) 19:277–279 has played in crystallizing modern thinking about outcomes, to gain a stronger appreciation of the schizophrenia. These studies have generated solid prodromal state and to aid in the design of optimal consensus about the severity, pattern, and typical course intervention or prevention strategies. of deficits. Perhaps most important has been apprecia- & Palmer et al. note that despite progress, there remains tion of the impact of these deficits on outcomes, leading no consensus about the fundamental pathophysiological to the view that cognitive impairments are indeed more processes involved in schizophrenia at either neural important than the symptoms now used to diagnose the systems or cognitive levels. Three integrative reviews disorder, both to advance understanding of pathophys- illustrate current thinking about these grand challenges. iology and to target for effective treatment. Starting from the rational premise that episodic memory & Corresponding to the increased appreciation that cogni- deficits have emerged as the most consistent and robust tive deficits are central to schizophrenia, research on markers of schizophrenia, Leavitt and Goldberg neuropsychological consequences of treatment has critically evaluate the relevant neuroanatomical, genetic, expanded dramatically. Harvey provides an incisive and behavioral evidence. They conclude that integrative survey of psychopharmacological strategies that have strategies, including advanced computational modeling been tried so far, and some that remain on the horizon. together with functional neuroimaging, may help Following what might be described as excessive (if not advance clearer mechanistic models of the memory “irrational”) exuberance over the cognitive gains seen in dysfunction that is already a well validated marker of early studies of the “atypical” antipsychotics, steady disability. Krauss, Keefe, and Krishnan present a progress has been made laying the groundwork for highly innovative perspective that aims to offer a systematic efforts to both identify agents capable of unified theory through which a common mechanism, modifying cognition in schizophrenia, and facilitate based on memory prediction errors, may help under- investigation of these agents using consensus methods stand not only why “memory deficits” are so prominent, (e.g., as accomplished by the MATRICS and TURNS but also why people with schizophrenia suffer from a initiatives). range of other symptoms, including disorders of & Stimulated in part by disappointment over the lack of perceptual processing. Such a perspective might help efficacy and effectiveness of new psychopharmacolog- significantly reorient thinking about the memory fail- ical treatments, the last decade also has witnessed a ures of schizophrenia, and other signs, with respect to surge of interest in non-pharmacological strategies to specific deficits in neuronal architecture, and more treat cognitive deficits in schizophrenia. Medalia and specific basic cognitive mechanisms underlying anoma- Choi provide an important perspective on the matura- lies in extracting and utilizing regularities of prior tion of cognitive remediation research in schizophrenia, experience. Finally, the contribution of Gold, Hahn, highlighting what are now appreciated as consistent Strauss & Waltz really does aim to “turn it upside moderate effects (which are greater than observed for down” and ask what we can learn from what is not any drug treatments so far), and emerging consensus impaired in people with schizophrenia. While some regarding the critical mediators and moderators of these might see the search for the holy grail of a specific treatments. deficit in schizophrenia as having met with abject & One clear mark of the maturation of neuropsychological failure, and adopted instead a generalized deficit model, research on schizophrenia is the increased emphasis on there are clearly areas of cognitive performance that identification of its developmental precursors, with an may, by virtue of their preservation, point us towards eye towards development of early intervention or even both clearer understanding of pathological processes (in prevention strategies. Two unique perspectives on these part by ruling out certain possibilities), and further issues are provided here (Pantelis et al.; Niendam et al.). highlight potential targets for remediation based on Pantelis et al. survey the results of neuropsychological preserved functions. and neuroimaging findings in individuals at high risk for later development of schizophrenia, and while there While these studies provide an enormous breadth and are promising leads, they conclude that further work depth of coverage, no collection of papers can reflect the focused on the dynamic, longitudinal patterns of change complete spectrum of current thinking about the neuropsy- in these indicators may be necessary going forward. chology of schizophrenia nor predict well what the “next Niendam et al. offer a compatible perspective, but big thing” may be. Recent genome-wide association studies highlight the critical importance of understanding both have highlighted what is likely to be greater complexity of social outcomes, and social cognitive predictors of these schizophrenia genetics than was previously anticipated, Neuropsychol Rev (2009) 19:277–279 279 with thousands of common alleles each having small unimaginable enigmata will have replaced those that we contributions to risk for both schizophrenia and bipolar confront today. disorder (The International Schizophrenia Consortium 2009). It is now also clearer that a broad collection of Acknowledgements Supported by the NIH Roadmap for Medical “generalist” genes likely explain the heritability of diverse Research/Common Fund, including Consortium for Neuropsychiatric Phenomics grants UL1DE019580 and PL1MH083271. cognitive traits (Butcher et al. 2006). These observations suggest that neuropsychology research is primed to move Disclosures There are no conflicts of interest to report. beyond
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