Fragility of information cascades: an experimental study using elicited beliefs

This paper examines the occurrence and fragility of information cascades in two laboratory experiments. One group of low informed participants sequentially guess which of two states has been randomly chosen. In a matched pairs design, another group of high informed participants make similar guesses after having observed the guesses of the low informed participants. In the second experiment, participants' beliefs about the chosen state are elicited. In equilibrium, low informed players who observe an established pattern of identical guesses herd without regard to their private information whereas high informed players always guess according to their private information. Equilibrium behavior implies that information cascades emerge in the group of low informed participants, the belief based solely on cascade guesses is stationary, and information cascades are systematically broken by high informed participants endowed with private information contradicting the cascade guesses. Experimental results show that the behavior of low informed participants is qualitatively in line with the equilibrium prediction. Information cascades often emerge in our experiments. The tendency of low informed participants to engage in cascade behavior increases with the number of identical guesses. Our main finding is that information cascades are not fragile. The behavior of high informed participants differs markedly from the equilibrium prediction. Only one-third of laboratory cascades are broken by high informed participants endowed with private information contradicting the cascade guesses. The relative frequency of cascade breaks is 15% for the situations where five or more identical guesses are observed. Participants' elicited beliefs are strongly consistent with their own behavior and show that, unlike in equilibrium, the more cascade guesses participants observe the more they believe in the state favored by those guesses.

Resident Aliens? Explaining Minority Disaffection with Democratic Politics in the Baltic States

Commentators and scholars alike recognize the important role political dissatisfaction plays in the process of regime change. A considerable body of literature has used dissatisfaction with a regime and distrust in political institutions to explain political dynamics during democratization's initial phase, yet these indicators are rarely used to assess disaffection with politics in established democratic regimes. Recent research on the post-communist region has established that citizens demonstrate high levels of political alienation, and that ethnic minority communities in particular are widely dissatisfied with democratic politics, institutions and regimes. This paper uses the 2004 data from the New Baltic Barometer to analyse individual-level disaffection with politics among the minorities in the Baltic States and explores the structural roots of such disaffection. The paper draws upon interviews with political representatives of minority communities in order to understand their perceptions of opportunities to participate in decision-making. Building on quantitative and qualitative analysis, the paper concludes that disaffection with politics among both the mass of ethnic minorities and their elite groups is best explained by the misrepresentation of minority interests in post-communist Baltic polities.

Civil society versus nationalizing state?:Advocacy of minority rights in the post-socialist Baltic states

Strong civil society provides individuals with arenas to bring their interests to the attention of policymakers. In so doing, civil society organizations (CSOs) can support state policies, but can also criticize policies. This paper argues that most minority rights advocacy CSOs in the Baltic states have little say in the crafting of policy and are compartmentalized into the existing agendas, with only a few groups able to evaluate policies independently. It concludes that the Baltic civil society is weak because the CSOs working on minority issues ask policymakers either too much, or too little. The findings suggest that policymakers quell criticism of their work from the side of the CSOs by ignoring their activities. Alternatively, by funding the CSO that shores up the state agenda, policymakers delegate their responsibilities to civic actors, keep critical voices from public debates and claim that their policies have the full support of a vibrant civil society. This paper investigates the options available for civil society actors to relate to policymakers in a nationalizing state by drawing on the data collected in 77 semi-structured interviews with the CSOs working with Russian and Polish minorities in the Baltic states between 2006 and 2009. © 2011 Association for the Study of Nationalities.

Autonomy and Control of State Agencies:Comparing States and Agencies

Do public organizations with similar tasks or structures differ across states with respect to their autonomy and control? If so, why? By comparing the autonomy, control and internal management of state agencies, this book shows how New Public Management doctrines actually work in three small European states with different politico-administrative regimes. Using a unique set of similar survey data on 226 state agencies in Norway, Ireland and Flanders, this study explains differences in agency autonomy, control and management by referring to international isomorphic pressures, state-specific politico-administrative regimes and characteristics of agencies. Therefore, organization theory and neo-institutional schools are used to formulate four competing theoretical perspectives and hypotheses are tested through simple and advanced statistical techniques. By comparing practices between states and between types of agencies, this study substantially enhances scientific knowledge about why public organizations are granted autonomy, why they are controlled in specific ways, and how autonomy affects internal management.

Exciton-Plasmon States in Nanoscale Materials: Breakdown of the Tamm-Dancoff Approximation

Within the Tamm-Dancoff approximation, ab initio approaches describe excitons as packets of electron-hole pairs propagating only forward in time. However, we show that in nanoscale materials excitons and plasmons hybridize, creating exciton-plasmon states where the electron-hole pairs oscillate back and forth in time. Then, as exemplified by the trans-azobenzene molecule and the carbon nanotubes, the Tamm-Dancoff approximation yields errors larger than the accuracy claimed in ab initio calculations. Instead, we propose a general and efficient approach that avoids the Tamm-Dancoff approximation, correctly describes excitons, plasmons, and exciton-plasmon states, and provides a good agreement with experimental results.

Frontal EEG/ERP correlates of attentional processes, cortisol and motivational states in adolescents from lower and higher socioeconomic status

Event-related potentials (ERPs) and other electroencephalographic (EEG) evidence show that frontal brain areas of higher and lower socioeconomic status (SES) children are recruited differently during selective attention tasks. We assessed whether multiple variables related to self-regulation (perceived mental effort) emotional states (e.g., anxiety, stress, etc.) and motivational states (e.g., boredom, engagement, etc.) may co-occur or interact with frontal attentional processing probed in two matched-samples of fourteen lower-SES and higher-SES adolescents. ERP and EEG activation were measured during a task probing selective attention to sequences of tones. Pre- and post-task salivary cortisol and self-reported emotional states were also measured. At similar behavioural performance level, the higher-SES group showed a greater ERP differentiation between attended (relevant) and unattended (irrelevant) tones than the lower-SES group. EEG power analysis revealed a cross-over interaction, specifically, lower-SES adolescents showed significantly higher theta power when ignoring rather than attending to tones, whereas, higher-SES adolescents showed the opposite pattern. Significant theta asymmetry differences were also found at midfrontal electrodes indicating left hypo-activity in lower-SES adolescents. The attended vs. unattended difference in right midfrontal theta increased with individual SES rank, and (independently from SES) with lower cortisol task reactivity and higher boredom. Results suggest lower-SES children used additional compensatory resources to monitor/control response inhibition to distracters, perceiving also more mental effort, as compared to higher-SES counterparts. Nevertheless, stress, boredom and other task-related perceived states were unrelated to SES. Ruling out presumed confounds, this study confirms the midfrontal mechanisms responsible for the SES effects on selective attention reported previously and here reflect genuine cognitive differences.

Exotic Domain States in Ferroelectrics: Searching for Vortices and Skyrmions

Very recent experimental and theoretical work has sought to find out whether or not complex arrangements of dipoles (such as flux-closure, vortex or skyrmion patterns) exist in ferroelectrics. While there is undoubtedly still considerable work to be done, enough insight has now been gained to warrant a brief discussion of progress to date. This review article attempts to undertake such a discussion.

A system lifeworld perspective on dying in long term care settings for older people:Contested states in contested places

In many Western countries, older people live and die in long-term institutional care settings. Habermas's concepts of lifeworld, system and communicative action are drawn upon to illuminate the experience of living and dying in this particular place. It is proposed that dying older adults, their family and care staff occupy different contested states and long term care settings are contested places, located in a wider system. This wider system, mediated through care homes, can colonise the life world experiences of dying individuals. The development of communicative space bridges the lifeworld and system and offers a way for the lifeworld of dying individuals, and those around them to be reintegrated into, and influence the wider system. © 2010 Elsevier Ltd.

Almost all quantum states have nonclassical correlations

Quantum discord quantifies nonclassical correlations in a quantum system including those not captured by entanglement. Thus, only states with zero discord exhibit strictly classical correlations. We prove that these states are negligible in the whole Hilbert space: typically a state picked out at random has positive discord and, given a state with zero discord, a generic arbitrarily small perturbation drives it to a positive-discord state. These results hold for any Hilbert-space dimension and have direct implications for quantum computation and for the foundations of the theory of open systems. In addition, we provide a simple necessary criterion for zero quantum discord. Finally, we show that, for almost all positive-discord states, an arbitrary Markovian evolution cannot lead to a sudden, permanent vanishing of discord.