Book Review

Abstract

Yukl, G.A. (1989). Leadership in organizations (2nd ed.), Prentice Hall International Editions. ISBN 0-1352-7169-X. £20.95.     

Meat on the menu? How the menu structure can stimulate vegetarian choices in restaurants

Excessive meat consumption has a negative impact on people's health, animal welfare, and the environment in general. Remarkably, however, despite the growing number of flexitarians, only a small number of people choose a vegetarian dish at a restaurant. Therefore, in the current study, we tested how vegetarian dishes need to be presented in order to stimulate the choice for these dishes. In an online study, participants were presented with one of four different menus: Either an all vegetarian menu, an all vegetarian menu with the possibility to add meat to each dish, a menu with increased offer on vegetarian dishes with explicit indication, and a menu with increased offer on vegetarian dishes without explicit indication. Subsequently, participants indicated how likely it was that they would eat in this restaurant and which dish they would choose (i.e., vegetarian or not). Additionally, they completed a reactance questionnaire. Results show that when people get the option to add meat to the vegetarian dishes on a menu this increases the choice for a vegetarian dish. No effect of menus on reactance and willingness to eat at a restaurant was found. These findings suggest that presenting meat as an alternative or additive option can help to change behavior toward a flexitarian lifestyle.     

Learning the value of money from stochastically varying prices

In 3 experiments, the authors investigated learning of the value of money from product prices in an unfamiliar currency when the prices are proportional to quantity. In support of the second stage of a hypothesized 2-stage process of learning, Experiment 1, in which 32 undergraduates participated, shows that response times for inferences of quantity are longer when participants are presented with quantity-price pairs than when they are presented with price-quantity pairs. Experiments 2 and 3, in which 54 and 34 undergraduates participated, respectively, show that (a) stochastic price variation causes systematic errors in the learning of unit prices from quantity-price pairs as a result of judgmental regression effects and (b) in support of the 2-stage learning hypothesis, inferences of quantity are the inverse of the learned unit prices.     

An experimental simulation study of advanced decision support system for ship navigation

A bridge with an integrated navigation system is compared to a less advanced conventionally equipped bridge in a full mission ship simulator to assess the extent to which fairway navigation benefits from information aids. Realistic scenarios were constructed including several demanding situations when navigating in a fairway. Twenty-two teams each consisting of two members with varying experience as Master Mariners and navigating officers participated in a repeated-measures design. Workload, performance and affective responses were measured. No statistical differences between the bridges were found on any of the dependent measures. The results imply that other factors than the available technology account for the observed differences across teams. A tendency was observed that experienced navigation officers performed better on the conventional bridge than the technically advanced bridge, whilst the opposite was true for less experienced navigation officers.     

STUDIES IN VISUAL PERCEPTION OF ARCHITECTURAL SPACES AND ROOMS

To test the hypothesis that perceived size of space depends on perceived depth, a relation between judged depth and size of space was derived. External spaces were judged from colour photographs by the magnitude estimation method. It was found that judged depth is a power function of physical depth and judged size of space a power function of physical size (rectangular area) or of judged depth times perceived width. The results indicate deviations from the derived relation and some explanations for these are discussed. Further research is needed to verify the proposed hypothesis.     

Sex differences in children's group embedded figures test performance

Despite the fact that sex differences in field dependence/independence have been a fairly constant feature in studies employing adults, doubt surrounds the status of similar sex differences in childhood. Several attempts have been made to explain these findings, the most popular being that group Embedded Figures Tests do not tap sex differences. A simpler explanation is that large enough Ns have not been employed in past research to allow the small sex difference present in childhood to emerge as a statistically significant phenomenon. This explanation is supported by the results of the present study which employed 1200 children and was able to demonstrate a significant sex difference at both 8 and 11 yr using the Children's Group Embedded Figures Test.     

Weighing the past and the future in decision making

Prior irreversible investments of money, time, or effort referred to as sunk costs frequently lead to decisions to continue a chosen course of action despite that this is irrational. With the aim of demonstrating that such escalation of commitment is a special case of a more general phenomenon, two experiments were carried out employing undergraduates as participants. Experiment 1 showed for fictitious personal and business investment scenarios that both prior losses and gains (sunk outcomes) affected choices to continue or discontinue the investment. In Experiment 2 the effect of sunk outcomes was reduced although not eliminated by a monetary bonus that in one condition depended on the future outcomes of the second gamble in two-stage gambles, in another condition on the future returns in personal investment scenarios. In support of a more inclusive theory subsuming escalation of commitment, the decisions were affected by both past and future outcomes and both gains and losses.