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2003

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Reproductive Genetics 1991-2002: A Selected Annotated Legal Bibliography Of Genetic Testing, Gene Transfer And Reproductive Cloning, Gail H. Javitt Jan 2003

Reproductive Genetics 1991-2002: A Selected Annotated Legal Bibliography Of Genetic Testing, Gene Transfer And Reproductive Cloning, Gail H. Javitt

Journal of Health Care Law and Policy

No abstract provided.

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Cutting Through The Confusion Of The Loss-Of-Chance Doctrine Under Ohio Law: A New Cause Of Action Or A New Standard Of Causation, George J. Zilich Jan 2003

Cutting Through The Confusion Of The Loss-Of-Chance Doctrine Under Ohio Law: A New Cause Of Action Or A New Standard Of Causation, George J. Zilich

Cleveland State Law Review

The central argument advanced in this Note is that a loss of chance should be recognized as an independent injury. This approach best serves the policy of the new loss of chance doctrine, and it avoids the very significant doctrinal problems that arise if the alternative approach is taken, which is to treat the compensability of lost chances as merely a relaxation of traditional tort law causation requirements. The primary focus of this Note is on the loss of a less-than-even chance of recovery or survival, wherein a victim will be entitled to damages resulting from the negligent reduction of …

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2003 Commencement Program, Morehead State University. Registrar's Office. Jan 2003

2003 Commencement Program, Morehead State University. Registrar's Office.

Morehead State Commencement Programs

2003 commencement programs of Morehead State University.

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Annual Report For The Town Of New Castle Fiscal Year 2002-2003., New Castle Town Representatives Jan 2003

Annual Report For The Town Of New Castle Fiscal Year 2002-2003., New Castle Town Representatives

New Castle, NH Annual Reports

This is an annual report containing vital statistics for a town/city in the state of New Hampshire.

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The Feminist And The Socialist: Adele And Alphonse Esquiros, Naomi J. Andrews Jan 2003

The Feminist And The Socialist: Adele And Alphonse Esquiros, Naomi J. Andrews

History

Among the many strands of political and intellectual dissidence during the July Monarchy, socialism and feminism must be counted as two of the most ephemeral and, paradoxically, the most enduring. Romantic socialism of the 1830s and 1840s saw a profusion of fantastical aspirations crushed by the failure of the revolution of 1848, and the brief flowering of feminism during the period was cut short by the social and political repression of the Second Empire. Their influence is still felt, though these original incarnations were short lived. For the duration of the July Monarchy and the Second Republic, however, both socialism …

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Size Selective Recognition Of Sirna By An Rna Silencing Suppressor, Jeff Vargason, Gyorgy Szittya, Jozsef Burgyan, Traci M. Tanaka Hall Jan 2003

Size Selective Recognition Of Sirna By An Rna Silencing Suppressor, Jeff Vargason, Gyorgy Szittya, Jozsef Burgyan, Traci M. Tanaka Hall

Faculty Publications - Department of Biological & Molecular Science

RNA silencing in plants likely exists as a defense mechanism against molecular parasites such as RNA viruses, retrotransposons, and transgenes. As a result, many plant viruses have adapted mechanisms to evade and suppress gene silencing. Tombusviruses express a 19 kDa protein (p19), which has been shown to suppress RNA silencing in vivo and bind silencing-generated and synthetic small interferingRNAs (siRNAs) in vitro. Here we report the 2.5 A° crystal structure of p19 from the Carnation Italian ringspot virus (CIRV) bound to a 21 nt siRNA and demonstrate in biochemical and in vivo assays that CIRV p19 protein acts as molecular …

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Effect Of Sequence On The Conformation Of Dna Holliday Junctions, Franklin A. Hays, Jeff Vargason, P. Shing Ho Jan 2003

Effect Of Sequence On The Conformation Of Dna Holliday Junctions, Franklin A. Hays, Jeff Vargason, P. Shing Ho

Faculty Publications - Department of Biological & Molecular Science

Structures of the DNA sequences d(CCGGCGCCGG) and d(CCAGTACbr5UGG) are presented here as four-way Holliday junctions in their compact stacked-X forms, with antiparallel alignment of the DNA strands. Thus, the ACC-trinucleotide motif, previously identified as important for stabilizing the junction, is now extended to PuCPy, where Pu is either an adenine or guanine, and Py is either a cytosine, 5-methylcytosine, or 5-bromouracil but not thymine nucleotide. We see that both sequence and base substituents affect the geometry of the junction in terms of the interduplex angle as well as the previously defined conformational variables, Jroll (the rotation of the stacked duplexes …

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Central Serotonin And Melanocortin Pathways Regulating Energy Homeostasis, Lora K. Heisler, Michael A. Cowley, Toshiro Kishi, Laurence H. Tecott, Wei Fan, Malcolm J. Low, James L. Smart, Marcelo Rubinstein, Jeffrey B. Tatro, Jeffrey M. Zigman, Roger D. Cone, Joel K. Elmquist Jan 2003

Central Serotonin And Melanocortin Pathways Regulating Energy Homeostasis, Lora K. Heisler, Michael A. Cowley, Toshiro Kishi, Laurence H. Tecott, Wei Fan, Malcolm J. Low, James L. Smart, Marcelo Rubinstein, Jeffrey B. Tatro, Jeffrey M. Zigman, Roger D. Cone, Joel K. Elmquist

Faculty Publications - Department of Biological & Molecular Science

It is now established that the hypothalamus is essential in coordinating endocrine, autonomic, and behavioral responses to changes in energy availability. However, the interaction of key peptides, neuropeptides, and neurotransmitters systems within the hypothalamus has yet to be delineated. Recently, we investigated the mechanisms through which serotonergic (5-hydroxytryptamine, 5-HT) systems recruit leptin-responsive hypothalamic pathways, such as the melanocortin systems, to affect energy balance. Through a combination of functional neuroanatomy, feeding, and electrophysiology studies in rodents, we found that 5-HT drugs require functional melanocortin pathways to exert their effects on food intake. Specifically, we observed that anorectic 5-HT drugs activate pro-opiomelanocortin …

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Lack Of Proopiomelanocortin Peptides Results In Obesity And Defective Adrenal Function But Normal Melanocyte Pigmentation In The Murine C57bl/6 Genetic Background, James L. Smart, Malcolm J. Low Jan 2003

Lack Of Proopiomelanocortin Peptides Results In Obesity And Defective Adrenal Function But Normal Melanocyte Pigmentation In The Murine C57bl/6 Genetic Background, James L. Smart, Malcolm J. Low

Faculty Publications - Department of Biological & Molecular Science

No abstract provided.

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Hypothalamic Proopiomelanocortin Neurons Are Glucose Responsive And Express Katp Channels, Nurhadi Ibrahim, Martha A. Bosch, James L. Smart, Jian Qiu, Marcelo Rubinstein, Oline K. Rønnekleiv, Malcolm J. Low, Martin J. Kelly Jan 2003

Hypothalamic Proopiomelanocortin Neurons Are Glucose Responsive And Express Katp Channels, Nurhadi Ibrahim, Martha A. Bosch, James L. Smart, Jian Qiu, Marcelo Rubinstein, Oline K. Rønnekleiv, Malcolm J. Low, Martin J. Kelly

Faculty Publications - Department of Biological & Molecular Science

Hypothalamic proopiomelanocortin (POMC) neurons are critical for controlling homeostatic functions in the mammal. We used a transgenic mouse model in which the POMC neurons were labeled with enhanced green fluorescent protein to perform visualized, whole-cell patch recordings from prepubertal female hypothalamic slices. The mouse POMC-enhanced green fluorescent protein neurons expressed the same endogenous conductances (a transient outward K current and a hyperpolarization-activated, cation current) that have been described for guinea pig POMC neurons. In addition, the selective -opioid receptor agonist DAMGO induced an outward current (maximum of 12.8 1.2 pA), which reversed at K equilibrium potential (EK), in the majority …

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The Anorexigenic Fatty Acid Synthase Inhibitor, C75, Is A Nonspecific Neuronal Activator, Kanji A. Takahashi, James L. Smart, Hongyan Liu, Roger D. Cone Jan 2003

The Anorexigenic Fatty Acid Synthase Inhibitor, C75, Is A Nonspecific Neuronal Activator, Kanji A. Takahashi, James L. Smart, Hongyan Liu, Roger D. Cone

Faculty Publications - Department of Biological & Molecular Science

C75, a recently derived compound that potently suppresses feeding and induces weight loss, has been proposed to act mainly by inhibiting fatty acid synthase (FAS) in central neurons that control feeding. For example, normal, fasting- associated, hypothalamic increases in neuropeptide Y (NPY)/Agouti-related protein (AGRP) expression and decreases in proopiomelanocortin (POMC)/cocaine and amphetamine regulated transcript (CART) expression were reported to be blocked by C75. Using loose-patch extracellular recording in acute slices, we tested the effect of C75 on anorexigenic POMC neurons and orexigenic NPY neurons of the hypothalamic arcuate nucleus, which were identified by promoter-driven GFP expression, as well as on …

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Intracellular Dynamics Of Lead And Calcium In Lead-Exposed Cultured Neurons Of Aplysia Californica (Mollusca: Opisthobranchia), Catherine T. Tamse Jan 2003

Intracellular Dynamics Of Lead And Calcium In Lead-Exposed Cultured Neurons Of Aplysia Californica (Mollusca: Opisthobranchia), Catherine T. Tamse

Open Access Dissertations

The neurotoxin lead (Pb2+) is a continuing health and environmental problem. However, its neurotoxic mechanism remains unclear. Since calcium (Ca2+) is vital in cellular processes and with Pb2+ reported to interfere with Ca2+-mediated processes, the hypothesis that Pb2+ subverts Ca2+ homeostasis by entering cells through Ca2+ transport pathways and displacing intracellular Ca2+ ([Ca2+] i) was investigated. A multi-technique approach tested this hypothesis. Using cultured Aplysia bag cell neurons, changes in transmembrane Ca2+ flux after Pb2+ exposure were directly measured with the Ca2+-selective self-referencing electrode. Cumulative concentrations of extracellular Pb2+ produced a corresponding and significant (P < 0.05) increase in Ca 2+ efflux, independent of time exposure. Ca2+ channel blockers Co2+, La3+, and verapamil inhibited Pb2+-induced flux. The sarco/endoplasmic reticulum Ca 2+-ATPase pump inhibitors, thapsigargin and cyclopiazonic acid, both elicited a Ca2+ efflux reflecting inhibition of ER pumps and [Ca2+]i release. Furthermore, Pb2+ evoked a moderate and sustained elevation in thapsigargin-stimulated Ca 2+ efflux. For morphological evidence that Pb2+ can mobilize [Ca 2+]i, potassium pyroantimonate (KPA) cytochemistry of bag cells were analyzed. 2% KPA resulted in widespread electron-dense precipitates. 10 mM EGTA + KPA or 200 μM Pb2+ + KPA both produced marked reductions of precipitates in neurons. X-ray microanalysis confirmed antimony (Sb) in precipitates but could not separate the overlapping Ca2+-Sb spectral peaks. However, reduced precipitates in EGTA-incubated cells indicate presence of Ca2+ in intracellular precipitates observed. No apparent pathological changes were correlated to Pb2+ exposure. The effects of Pb2+ on [Ca2+]i using the fluorescent Ca2+ indicator, chlortetracycline (CTC), was examined. Control neurons incubated in 10 μM CTC demonstrated extensive yellow-green fluorescence while reduced fluorescence intensities were seen in cells exposed to 200 μM Pb2+. Multi-sized punctate fluorescence were observed along the perimeter and sometimes, throughout the soma. No neuronal autofluorescence nor neuritic fluorescence in control and Pb2+-exposed cells were detected. Average fluorescence intensities between control and Pb2+-exposed neurons were statistically significant (P < 0.0005). Collectively, these results are consistent with the hypothesis that Pb 2+ perturbs Ca2+ homeostasis via mobilization of [Ca 2+]i. Pb2+ operates through Ca2+ transport pathways as shown by changes in transmembrane Ca 2+ flux, in KPA precipitate reactions, and in CTC fluorescence.

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Why Does The American Constitution Lack Social And Economic Guarantees?, Cass R. Sunstein Jan 2003

Why Does The American Constitution Lack Social And Economic Guarantees?, Cass R. Sunstein

Public Law and Legal Theory Working Papers

Why does the American Constitution lack contain social and economic guarantees, which appear in most contemporary constitutions? This essay explores four possible answers: chronological, cultural, institutional, and realist. The chronological explanation emphasizes the fact that in the late eighteenth century, social and economic rights simply were not on the viewscreen for constitution-makers. The point is correct, but as a complete account, the chronological explanation fails for the simple reason that constitutional meaning changes over time. The institutional explanation emphasizes that Americans typically see constitutional rights not as mere goals or aspirations, but as pragmatic instruments for judicial enforcement. The difficulty …

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Land Preservation, John R. Nolon Jan 2003

Land Preservation, John R. Nolon

Elisabeth Haub School of Law Faculty Publications

This exploration of local preservation law and practice recognizes the critical influences of federal, state, and regional governments. Local governments are instruments of state governments; municipalities derive their authority from state statutes. Extensive control over land use has been given to localities, but important powers have been retained. State governments are the partners of federal agencies that are charged with protecting environmental resources that are subject to federal jurisdiction. The land use system that has evolved over the last century in this country is intensely intergovernmental and interdependent. While this system was not designed as a whole and is often …

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Paladin Plaza, Furman University Jan 2003

Paladin Plaza, Furman University

Furman Magazine

Home entrance to football stadium will have new, sculpted look

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Golden And Its Emanations: The Surprising Origins Of Smart Growth, John R. Nolon Jan 2003

Golden And Its Emanations: The Surprising Origins Of Smart Growth, John R. Nolon

Elisabeth Haub School of Law Faculty Publications

This article provides the background for the adoption of the Ramapo ordinance, explains its precocious inventions in some detail, and describes other dramatic local inventions emanating from the Ramapo approach to smart growth. It ends with a reflection on the Quiet Revolution, the continuing disquiet that accompanies the spectacular smart growth inventions of local governments in this country, and modest recommendations for reform. Along the way, the reader will encounter the rebirth of performance zoning, local environmental laws that protect critical environmental resources, a local abandoned property reclamation act, the use of mediation to solve border wars between localities, an …

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The Current Controversy Regarding Tmdls: Contemporary Perspectives "Tmdls And Pollutant Trading", Ann Powers Jan 2003

The Current Controversy Regarding Tmdls: Contemporary Perspectives "Tmdls And Pollutant Trading", Ann Powers

Elisabeth Haub School of Law Faculty Publications

The article first summarizes CWA requirements relevant to TMDLs and outlines elements of an effective trading program. It then examines the program recently established by the State of Connecticut to allow trading of nitrogen credits among sewage treatment plants on Long Island Sound to achieve an established TMDL, and the CWA issues presented. Finally, it gives a brief comparison to the program being designed for the Chesapeake Bay, for which no TMDL has been established. Current brief descriptive summaries of several often cited programs are appended.

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Enforcing Environmental Norms: Diplomatic And Judicial Approaches, Nicholas A. Robinson Jan 2003

Enforcing Environmental Norms: Diplomatic And Judicial Approaches, Nicholas A. Robinson

Elisabeth Haub School of Law Faculty Publications

Environmental norms are observed because they are norms about how people respect each other and the natural systems that sustain human communities. Environmental norms are basic to human well-being. They arise out of the human condition, not unlike human rights laws. Environmental norms emerge from the fact that humans exist within ecosystems, and human society is embedded in the natural systems in which they have evolved; environmental norms are grounded in an objective reality, and scientists can measure the consequences of observing--or failing to observe--those norms. The provisions of environmental norms, therefore, exist not merely as pronouncements of governments, applied …

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Characterization Of Polyphenol Oxidase From Jerusalem Artichoke (Helianthus Tuberosus), Emi̇ne Zi̇yan, Şule Pekyardimci Jan 2003

Characterization Of Polyphenol Oxidase From Jerusalem Artichoke (Helianthus Tuberosus), Emi̇ne Zi̇yan, Şule Pekyardimci

Turkish Journal of Chemistry

Polyphenol oxidases (PPO) in Jerusalem arthichoke (Helianthus tuberosus) skin and flesh were extracted and purified through (NH_{4})_{2}SO_{4} precipitation, dialysis and gel filtration chromatography. The samples obtained from ammonium sulfate precipitation and dialysis were used for the characterization of crude skin and flesh PPO. Optimum pH values were 7.5 for skin PPO and 8.0 for flesh PPO with 50 mM catechol. The optimum temperatures for skin and flesh PPO were 25 °C and 30 °C respectively with catechol. Six inhibitors were tested in the study and the most effective inhibitors were found to be sodium azide and thiourea for both flesh …

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Application Of A Three-Stage Sequential Extraction Procedure For The Determination Of Extractable Metal Contents In Highway Soils, Şeri̇fe Tokalioğlu, Şenol Kartal, Gökhan Bi̇rol Jan 2003

Application Of A Three-Stage Sequential Extraction Procedure For The Determination Of Extractable Metal Contents In Highway Soils, Şeri̇fe Tokalioğlu, Şenol Kartal, Gökhan Bi̇rol

Turkish Journal of Chemistry

A sequential extraction procedure, a three-step protocol proposed by the Standards, Measurements and Testing programme (SM & T--formerly BCR) of the European Union, was applied to soil samples for the determination of metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn). This procedure provides measurements of extractable metals from media such as acetic acid (0.11 mol L^{-1}), hydroxylammonium chloride (0.1 mol L^{-1}) and hydrogen peroxide (8.8 mol L^{-1}) plus ammonium acetate (1 mol L^{ - 1}), which are exchangeable, reducible and oxidisable metals, respectively. Analyses were carried out using flame atomic absorption spectrometry (FAAS). The results obtained from …

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Thinking Race, Making Nation (Reviewing Glenn C. Loury, The Anatomy Of Racial Inequality), Christopher A. Bracey Jan 2003

Thinking Race, Making Nation (Reviewing Glenn C. Loury, The Anatomy Of Racial Inequality), Christopher A. Bracey

GW Law Faculty Publications & Other Works

We live in a race-conscious culture. As Americans, we are a nation of people who self-consciously chose to adopt a vision of society that embraced lofty ideals of individual freedom and democracy for all along with powerful mechanisms for devastating racial oppression. Our history is replete with instances of differential treatment on account of race - slavery being only the most egregious example - that achieved the desired effect of generating remarkable disparities in socioeconomic well-being among individuals and between different racial groups. Such disparities are not simply historical artifacts. They are facts of the contemporary American racial landscape as …

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Caught In The Crossfire: A Defense Of The Cultural Theory Of Gun-Risk Perceptions, Donald Braman, Dan M. Kahan Jan 2003

Caught In The Crossfire: A Defense Of The Cultural Theory Of Gun-Risk Perceptions, Donald Braman, Dan M. Kahan

GW Law Faculty Publications & Other Works

In this article, Dan Kahan and Donald Braman expand upon the cultural theory of gun-risk perception and respond to the commentaries on their previous article, More Statistics, Less Persuasion: A Cultural Theory of Gun-Risk Perceptions, 151 U. Pa. L. Rev. 1291 (2003). Their critics argue that the authors are too quick to dismiss the power of empirical information to influence individuals’ positions on gun control. But in analyzing the variety of their critics’ arguments, Kahan and Braman note the strange pattern of opinions that has emerged on the relative importance of culture and data in the gun debate. What could …

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States As Nations: Dignity In Cross-Doctrinal Perspective, Peter J. Smith Jan 2003

States As Nations: Dignity In Cross-Doctrinal Perspective, Peter J. Smith

GW Law Faculty Publications & Other Works

In a series of recent decisions, the Supreme Court has asserted that the states' sovereign immunity from suit serves principally to protect the "dignity" of the states. This seemingly oxymoronic notion has perplexed and amused commentators, who have tended to dismiss it largely as rhetorical flourish without substantive content. Although the concept of state dignity is at best an unusual anchor for a doctrine that already has been roundly criticized as unfaithful to constitutional history, text, and structure, the notion of state dignity is not foreign to the law. This article argues that in relying on state dignity, the Court's …

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Vertical Restraints And Intellectual Property Law: Beyond Antitrust, Michael J. Meurer Jan 2003

Vertical Restraints And Intellectual Property Law: Beyond Antitrust, Michael J. Meurer

Faculty Scholarship

This Article describes how intellectual property (IP) law regulates six types of vertical restraints: restrictions on the field or location of use; restrictions on sharing; control over the frequency of use; restrictions on repair and modification; packaging requirements; and impediments to a buyer's decision to exit its relationship with a seller. There are three reasons to focus on IP oversight of vertical restraints separately from antitrust oversight. First, IP law covers a broader range of vertical restraints. Second, economic analysis of the antitrust-IP conflict focuses mainly on the potential of vertical restraints to exclude downstream competitors. IP doctrines that regulate …

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Secret Settlements And Practice Restrictions Aid Lawyer Cartels And Cause Other Harms, David A. Dana, Susan P. Koniak Jan 2003

Secret Settlements And Practice Restrictions Aid Lawyer Cartels And Cause Other Harms, David A. Dana, Susan P. Koniak

Faculty Scholarship

In this article, the authors argue that the use of secrecy agreements and practice restrictions in settlement contracts should be prohibited not only by the ethics rules, but also by criminal and civil law. The authors begin by discrediting four arguments that are traditionally employed to support the use of secrecy agreements and practice restrictions. They then argue that the use of secrecy agreements and practice restrictions generate substantial costs, but do not secure any legitimate benefits that could not be attained by other, less costly means. The authors also explain how the problems caused by secrecy agreements and practice …

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An Extended Hierarchical Task Analysis For Error Prediction In Medical Devices, Phillip H. Chung, Jiajie Zhang, Todd R. Johnson, Vimla L. Patel Jan 2003

An Extended Hierarchical Task Analysis For Error Prediction In Medical Devices, Phillip H. Chung, Jiajie Zhang, Todd R. Johnson, Vimla L. Patel

Faculty, Staff and Student Publications

This paper introduces an extended hierarchical task analysis (HTA) methodology devised to evaluate and compare user interfaces on volumetric infusion pumps. The pumps were studied along the dimensions of overall usability and propensity for generating human error. With HTA as our framework, we analyzed six pumps on a variety of common tasks using Norman’s Action theory. The introduced method of evaluation divides the problem space between the external world of the device interface and the user’s internal cognitive world, allowing for predictions of potential user errors at the human-device level. In this paper, one detailed analysis is provided as an …

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Perfecting Patent Prizes, Michael B. Abramowicz Jan 2003

Perfecting Patent Prizes, Michael B. Abramowicz

GW Law Faculty Publications & Other Works

A number of commentators in recent years have suggested permitting holders of intellectual property rights to give up these rights in exchange for cash prizes from the government. In this Article, Professor Abramowicz shows that each of the proposals has significant flaws that would make implementation impractical and argues that no single perfect formula or algorithm for determining the size of prizes exists. A prize system is nonetheless worth pursuing because it could increase social welfare significantly by eliminating deadweight loss. Professor Abramowicz recommends a relatively simple approach that would complement rather than replace the patent system. The proposal is …

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Which Ties Bind? Redefining The Parent-Child Relationship In An Age Of Genetic Certainty, Naomi R. Cahn, June Carbone Jan 2003

Which Ties Bind? Redefining The Parent-Child Relationship In An Age Of Genetic Certainty, Naomi R. Cahn, June Carbone

GW Law Faculty Publications & Other Works

This article addresses the role of the genetic tie in the parent-child relationship through three lenses. First, we argue that the legal system recognizes children's rights not by treating children as autonomous actors, but by identifying the individuals and institutions most likely to promote children's interests and encouraging their success. Second, we examine the existing empirical and socio-biological literature that considers the importance of biological relationships, and concludes that it demonstrates not a single set of answers, but a set of tradeoffs. The well-being of young children, particularly in societies less prosperous than our own, may depend on the mother's …

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The World Trade Organization And Law Enforcement, Steve Charnovitz Jan 2003

The World Trade Organization And Law Enforcement, Steve Charnovitz

GW Law Faculty Publications & Other Works

Increased threats from transborder criminal activity are leading to stronger governmental and intergovernmental responses in the military, judicial, and regulatory arenas. These efforts, particularly the non-military efforts, raise a new issue in international economic law: the intersection between trade and law enforcement. This paper provides an overview of this “trade and law enforcement” linkage in four areas: (1) security, (2) health, (3) human rights, and (4) environmental protection. To explain the linkage between trade and law enforcement, I present the taxonomy of how trade measures are usable for law enforcement, and I offer a synopsis of the WTO provisions relevant …

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Social Complexity And Transitive Inference In Corvids, Alan B. Bond, Alan Kamil, Russell P. Balda Jan 2003

Social Complexity And Transitive Inference In Corvids, Alan B. Bond, Alan Kamil, Russell P. Balda

Papers in Behavior in Biological Sciences

The social complexity hypothesis asserts that animals living in large social groups should display enhanced cognitive abilities along predictable dimensions. To test this concept, we compared highly social pinyon jays, Gymnorhinus cyanocephalus, with relatively nonsocial western scrub-jays, Aphelocoma californica, on two complex cognitive tasks relevant to the ability to track and assess social relationships. Pinyon jays learned to track multiple dyadic relationships more rapidly and more accurately than scrub-jays and appeared to display a more robust and accurate mechanism of transitive inference. These results provide a clear demonstration of the association between social complexity and cognition in animals.

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