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Main Title: The more the better? The impact of number of stages of likelihood alarm systems on human performance
Author(s): Balaud, Magali
Manzey, Dietrich
Type: Conference Object
Language Code: en
Abstract: Responses to alarms involve decisions under uncertainty. Operators do not know if an alarm is more likely to be a hit or a false alarm. Likelihood alarm systems (LAS) help reduce this uncertainty by providing information about the certainty of their output. Unlike traditional binary alarm systems, they have three or more stages: each one represents a different degree of likelihood that a critical event is really present. Consequently, the more stages, the more specific is the information provided by the alarm system to reduce uncertainty. A laboratory experiment with 48 participants was conducted to investigate the effect of specificity of information of LAS on performances and responding behaviour. Specifically, a three-stage, four-stage, and five-stage LAS were compared using a multi-task environment. Results show higher percentages of correct decisions in the alarm task when participants used the four- and five-stage LAS than the three-stage LAS but no significant differences were found between the four-and five-stage LAS. Interesting differences in response patterns were also observed. This study suggests that four stages is the best degree of specificity for optimal performance.
Issue Date: 2015
Date Available: 9-Jul-2019
DDC Class: 100 Philosophie und Psychologie
620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): alarm system
human behaviour
likelihood alarm systems
cry-wolf effect
Proceedings Title: Proceedings of the Human Factors and Ergonomics Society Europe Chapter 2014 Annual Conference
Editor: de Waard, Dick
Sauer, Jürgen
Röttger, Stefan
Kluge, Annette
Manzey, Dietrich
Weikert, Clemens
Toffetti, Antonella
Wiczorek, Rebecca
Brookhuis, Karel
Hoonhout, Jettie
Publisher: Human Factors & Ergonomics Society
Publisher Place: Santa Monica, CA
Page Start: 61
Page End: 72
EISSN: 2333-4959
Appears in Collections:FG Arbeits-, Ingenieur- und Organisationspsychologie » Publications

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