Effects of Unimodal and Multimodal Cues About Threat Locations on Target Acquisition and Workload

Two studies were conducted to examine the effects of unimodal and multimodal cueing techniques for indicating the location of threats on target acquisition, the recall of information from concurrent communications, and perceived workload. One visual, two auditory (i.e., nonspatial speech and spatial tones [3-D]), and one tactile cue were assessed in Experiment 1. Experiment 2 examined the effects of combinations of the cues assessed in the first investigation: visual + nonspatial speech, visual + spatial tones, visual + tactile, and nonspatial speech + tactile. A unimodal, “visual only” condition was included as a baseline to determine the extent to which a supplementary cue might influence changes in performance and workload. The results of the studies indicated that time to first shot and the percentage of hits can be improved and workload reduced by providing cues about target location. The multimodal cues did not yield significant improvements in performance or workload beyond that achieved by the unimodal visual cue.     

Prologue: Introduction and Overview to Special Volume

Abstract

The editors provide an overview of the obstacles that prevent us from ending child abuse in the United States and briefly summarize the various articles in this volume that address these obstacles from multiple points of view.     

The Effects of a Racist Act and Public Counter-Demonstrations on Race-Related Behavioral Intentions: A Natural Experiment

This study reports on a natural experiment that yielded information about the effects of a racist act and public counter-demonstrations on behavioral intentions. The conditions for this natural experiment arose when an act of racial hostility occurred at a small liberal-arts college in the northeastern United States. This event occurred approximately midway through data collection for a study comparing public and private behavioral intentions to donate money to African American interest groups. This coincidence afforded the opportunity to examine the effects of such events on members of the affected community. The results of this natural experiment show that both public and private expression of support for African American interest groups increased after the incident and ensuing demonstrations.     

Assessing volunteer motives: a comparison of an open‐ended probe and Likert rating scales

The purpose of the present study was to compare the motives of volunteers (career, esteem, protective, social, understanding, and value) as assessed by an open‐ended probe and the Volunteer Functions Inventory (VFI) which employs a Likert rating scale. One‐hundred‐and‐twenty‐nine individuals, who volunteered for an organization that focuses on episodic volunteering in the community, completed both measures of volunteer motives and reported their frequency of volunteering for the organization. The Spearman rank correlation between the rankings of the six volunteer motives in the two distributions was 0.71. The maximum variance shared between the same motive as assessed by the two methods was 0.14. Frequency of volunteering for the organization was predicted by the value (positive predictor) and social (negative predictor) VFI scale scores. A post hoc analysis of the data from the open‐ended probe revealed three additional motives for volunteering—enjoyment, religiosity, and team building. Copyright © 2002 John Wiley & Sons, Ltd.     

Active selection of items to be remembered: The role of timing

A series of experiments was carried out in which Ss were required to extract critical stimuli from a stream of nine spoken inputs, presented at various rates, and report on these after the presentation of each list. The critical items were normally digits at positions 2, 4, 6, and 8 in the input sequence. Subjects were required to employ either an “active” extraction strategy, aimed at achieving temporary storage only of items to be remembered, or a “passive” strategy, involving storage of all inputs with subsequent extraction of critical items. The initial experiment showed that the active strategy markedly improved performance efficiency as the presentation rate decreased; passive performance remained relatively stable. Experiments 2 and 3 indicated that the level of active performance was higher when critical items were categorically different from unwanted items. There were indications that this effect was independent of the effect of changes in the presentation rate.The final experiments in the series showed that when Ss were denied the opportunity of predicting the time of arrival of critical items active performance hardly benefitted from a reduction in rate.A “controlled activation” process is proposed as a basis for S's ability to modulate his state of alertness, so as to maximize receptivity for critical stimuli arriving at well-defined points in time.