Substitutes for leadership in anaesthesia teams and their impact on leadership effectiveness

In this study we aim to increase our understanding of leadership in anaesthesia teams by investigating the relationship between substitutes for leadership, leadership behaviour, and team performance in situations with varying levels of routine and standardization. The present study relied on video recordings of 12 anaesthesia teams in a simulated setting with the occurrence of a nonroutine event. Clinical team performance was measured by the speed of adequate team reaction to this event. The leadership behaviours observed were coded either as content oriented (e.g., information transmission) or structuring (e.g., assigning tasks). Results showed that leadership behaviour changed depending upon the level of routine of a situation, the degree of standardization, and, to some extent, on the experience of team members. Leadership tends to be positively related to team performance during nonroutine and low standardized situations but negatively related to team performance in routine and highly standardized situations. Furthermore, leadership is only slightly related to team member experience. This study improves our understanding of influences of substitutes for leadership on successful leadership behaviour in anaesthesia teams. The findings also lead to suggestions for both further research and the enhancement of team leadership in critical care.     

Dendrite growth velocity in the undercooled melt of glass forming Ni50Zr50 compound

Glass-forming Ni₅₀Zr₅₀ intermetallic compound is containerless undercooled and solidified using electrostatic levitation. Large undercoolings up to ?T = 300 K are achieved. The dendrite growth velocity of the congruently melting alloy is measured as a function of undercooling using a high-speed camera technique. The experimental data is analysed within a sharp interface theory. It is found that the driving force of crystallisation is controlling the growth kinetics at ?T < 250 K but at larger undercoolings the growth kinetics is progressively controlled by atomic diffusion. This leads to a slowing down of the growth velocity. The maximum velocity and the temperature at which the maximum occurs (T_max) are inferred from the dendrite growth velocity – undercooling relation. The relation of the temperature T_max and the glass temperature fits into a general classification scheme for glass-forming systems. The kinetic and thermal undercooling terms are calculated within dendrite growth theory as a function of the total undercooling. At ?T > 126 K, the kinetic undercooling dominates and increases rapidly with the undercooling ?T. The maximum prefactor of the kinetic undercooling is plotted vs. the reciprocal temperature. Its temperature dependence is discussed.     

Measurement of self-evaluative motives: a shopping scenario

To develop measures of consumers' self-evaluative motives of Self-verification, Self-enhancement, and Self-improvement within the context of a mall shopping environment, an initial set of 49 items was generated by conducting three focus-group sessions. These items were subsequently converted into shopping-dependent motive statements. 250 undergraduate college students responded on a 7-point scale to each statement as these related to the acquisition of recent personal shopping goods. An exploratory factor analysis yielded five factors, accounting for 57.7% of the variance, three of which corresponded to the Self-verification motive (five items), Self-enhancement motive (three items), and Self-improvement motive (six items). These 14 items, along with 9 reconstructed items, yielded 23 items retained and subjected to additional testing. In a final round of data collection, 169 college students provided data for exploratory factor analysis. 11 items were used in confirmatory factor analysis. Analysis indicated that the 11-item scale adequately captured measures of the three self-evaluative motives. However, further data reduction produced a 9-item scale with marked improvement in statistical fit over the 11-item scale.     

The Functional Integration of Sole-Male Images into Magazine Advertisements

This study is a content analysis of the functions of sole nudes appearing in advertisements obtained from Business Week, Esquire, GQ, Playboy, Rolling Stone, and Sports Illustrated for the year 1993. The specific objective of the study was to ascertain how men appearing by themselves are incorporated into advertisements. Functions—the purpose people serve in the ads—were assessed by examining the sole males' roles and occupations, how their images were incorporated into the physical space in the visual portion of the ad, and what their presence contributed to the overall ad execution. Differences were found across magazine titles regarding the nature and use of sole-male images in ads. In total, the results suggest a need to closely evaluate male images in advertisements. Suggestions for future research are offered.     

The method of minimum variation for the combination of criteria

The problem of weighting separate criterion variates is solved by minimizing the differences among the standard scores of the individual upon the various measures. The method is compared with Horst's procedure of maximizing the inter-individual differences. An application is made to personnel data.This technique was developed in connection with a study of the prediction of success of salespersons, which is being carried on by the Occupational Research Program of the United States Employment Service.     

Interactions of team mental models and monitoring behaviors predict team performance in simulated anesthesia inductions

In the present study, we investigated how two team mental model properties (similarity vs. accuracy) and two forms of monitoring behavior (team vs. systems) interacted to predict team performance in anesthesia. In particular, we were interested in whether the relationship between monitoring behavior and team performance was moderated by team mental model properties. Thirty-one two-person teams consisting of anesthesia resident and anesthesia nurse were videotaped during a simulated anesthesia induction of general anesthesia. Team mental models were assessed with a newly developed measurement tool based on the concept-mapping technique. Monitoring behavior was coded by two organizational psychologists using a structured observation system. Team performance was rated by two expert anesthetists using a performance-checklist. Moderated multiple regression analysis revealed that team mental model similarity moderated the relationship between team monitoring and performance; a higher level of team monitoring in the absence of a similar team mental model had a negative effect on performance. Furthermore, team mental model similarity and accuracy interacted to predict team performance. Our findings provide new insights on factors influencing the relationship between team processes and team performance in health care. When investigating the effectiveness of a specific team coordination behavior, team cognition has to be taken into account. This represents a necessary and compelling extension of the popular process-outcome relationship on which previous teamwork research in health care has focused. Moreover, the current study adds further external validity to the concept of team mental models by highlighting its usefulness in health care.     

Why didn’t you say something? Effects of after-event reviews on voice behaviour and hierarchy beliefs in multi-professional action teams

Team decision-making can go wrong when individuals fear to voice suggestions or concerns to higher status team members. We investigate how after-event reviews (AERs) can be used to promote voice behaviour and hierarchy-attenuating beliefs in multi-professional action teams. We hypothesized that (1) lower status team members will speak up more following an assertiveness-specific AER (ASAER) as compared to a teamwork-generic AER (TGAER) and (2) that an ASAER leads to stronger endorsement of hierarchy-attenuating beliefs than the TGAER. To test these hypotheses, we implemented simulations of medical emergencies with 20 healthcare teams consisting of low (i.e., nurses) and high-status (i.e., physicians) professions. After participating in one of the two AERs, teams managed a simulation in which a higher status confederate engaged in potentially harmful actions. Behavioural coding of the videotaped simulations and assessment of team members’ hierarchy beliefs supported both hypotheses: nurses spoke up more following the ASAER than following the TGAER and both professional groups reported significantly higher levels of hierarchy-attenuating beliefs following the ASAER as compared to the TGAER. We discuss how AERs can affect upward voice and increase awareness for the potential downsides of status hierarchies in multi-professional teams.     

Appraising gender role portrayals in TV commercials

The Bem Sex-Role Inventory (BSRI) was used to appraise the gender role orientations of characters appearing in prime-time television advertisements. Four hundred twenty-six college students (primarily Caucasian) rated major ad characters on the BSRI and provided perceptual judgments about the character and ad presentation. The confirmatory analysis of the psychometric properties of the BSRI indicated the appropriateness of the scale for self- and person-perception ratings. BSRI Femininity and Masculinity subscale scores for the ad characters were analyzed as continuous variables. Counterstereotypic female characters had significantly higher Masculinity scores than stereotypic female characters and counterstereotypic male characters had significantly higher Femininity scores than stereotypic male characters. The BSRI was also a significant predictor of character and ad perceptions. A new direction for gender role research is presented.