Where Infants Look Determines How They See: Eye Movements and Object Perception Performance in 3‐Month‐Olds

A fundamental question of perceptual development concerns how infants come to perceive partly hidden objects as unified across a spatial gap imposed by an occluder. Much is known about the time course of development of perceptual completion during the first several months after birth, as well as some of the visual information that supports unity perception in infants. The goal of this investigation was to examine the inputs to this process. We recorded eye movements in 3‐month‐old infants as they participated in a standard object unity task and found systematic differences in scanning patterns between those infants whose post‐habituation preferences were indicative of unity perception versus those infants who did not perceive unity. Perceivers, relative to nonperceivers, scanned more reliably in the vicinity of the visible rod parts and scanned more frequently across the range of rod motion. These results suggest that emerging object concepts are tied closely to available visual information in the environment, and the process of information pickup.     

Simulation assessments of statistical aspects of bioequivalence in the pharmaceutical industry

An Erratum has been published for this article in Pharmaceutical Statistics 2004; 3(3): 232 Since the early 1990s, average bioequivalence (ABE) has served as the international standard for demonstrating that two formulations of drug product will provide the same therapeutic benefit and safety profile. Population (PBE) and individual (IBE) bioequivalence have been the subject of intense international debate since methods for their assessment were proposed in the late 1980s. Guidance has been proposed by the Food and Drug Administration (FDA) for the implementation of these techniques in the pioneer and generic pharmaceutical industries. Hitherto no consensus among regulators, academia and industry has been established on the use of the IBE and PBE metrics. The need for more stringent bioequivalence criteria has not been demonstrated, and it is known that the PBE and IBE criteria proposed by the FDA are actually less stringent under certain conditions. The statistical properties of method of moments and restricted maximum likelihood modelling in replicate designs will be summarized, and the application of these techniques in the assessment of ABE, IBE and PBE will be considered based on a database of 51 replicate design studies and using simulation. Copyright © 2004 John Wiley & Sons, Ltd.     

Web Survey Design: Paging versus Scrolling

A key choice in the design of Web surveys is whether to placethe survey questions in a multitude of short pages or in longscrollable pages. There are advantages and disadvantages ofeach approach, but little empirical evidence to guide the choice.In 2003 we conducted a survey of over 21,000 undergraduate students.Ten percent of the 10,000 respondents were directed to the scrollableversion of the survey, containing a single form for each ofthe major sections. The balance was assigned to the paging version,in which questions were presented to be visible without scrolling.The instrument contained a maximum of 268 possible questions,including topics that varied in sensitivity and desirability.The survey also permitted comparison of the effect of skip patternsby implementing skip instructions and hyperlinks in the scrollabledesign, and also recorded time at the end of each of the fivetopical sections. Differences between designs are evaluatedin terms of various forms of nonresponse, univariate and bivariatemeasurement properties, and proxies for respondent burden.     

Pay and productivity in “corporatist” Germany

Conventional theory predicts that productivity gains lead to pay hikes. Pay increases, however, can influence labor productivity. But what about the case of a corporatist economy, in which wage setting is highly coordinated? With cor-poratist cooperation between unions and management, is pay de-coupled from productivity? Using an innovative technique, this study disentangles the rela-tionship between pay and productivity in Germany. Citing high unemployment and increasingly global competition, critics have argued that Germany's brand of corporatist labor relations cannot survive. Our findings show that links between productivity and pay were different in the 1990s than in earlier years, suggesting that the collective bargaining process now works differently.     

Home-to-Work Conflict,Work Qualities,and Emotional Distress

Among a representative sample of employed men and women in Toronto, Canada, home-to-work conflict is associated positively with anxiety and depression. Two hypotheses propose work qualities as moderators. The double disadvantage hypothesis predicts that home-to-work conflict is more distressing when work is nonautonomous, routine, or noxious. The intrusion on job status/rewards hypothesis predicts that conflict is more distressing when work is autonomous, nonroutine, or nonnoxious. Results show that the association between home-to-work conflict and distress is stronger (1) among people in more autonomous jobs; (2) among women in routinized jobs; and (3) among men in noxious environments.     

The Nature of Infants' Visual Expectations for Event Content

Recent studies have revealed that young infants can form expectations for the spatial location of future visual events. Four experiments examined whether 3‐month‐old infants also form expectations for content features of events, defined as an invariant color combination. Infants viewed a spatially alternating (left–right) sequence of varying pictures in which pictures on one side (invariant colors) always appeared with the same color combination (e.g., red/green), while on the other side (varied colors) the pictures appeared with any of 4 possible color combinations. Results indicated that infants formed a content expectation for the invariant color combination on the invariant side, such that their anticipatory responding was disrupted by a novel color combination event and by a novel pattern event. A dissociation between reactive and anticipatory eye movements in their sensitivity to the content manipulation suggests that infants' expectations for spatial and content information engage somewhat different processes.     

The relative effects of craft-level strikes: The case of airlines

One aspect of bargaining power is the ability of unions to impose losses on firms by striking. Using stock market data from 1963 through 1986, this study tests whether strikes by different crafts have resulted in different losses for airlines. The evidence indicates that strikes by pilots and mechanics initially reduced the share value of struck airlines and that strikes by airline workers in other jobs did not result in significant share value losses. There is no evidence that strikes have imposed permanent losses on air carriers. The authors thank Gordon Karels, David Rosenbaum, and Hendrik Van Den Berg for their helpful comments and thoughtful suggestions. We also thank Jerrold Glass of the Airline Industrial Relations Conference for providing the data on airline strikes.