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CCTV Observation: The Effects of Event Type and Instructions on Fixation Behaviour in an Applied Change Blindness Task

Graham, G, Sauer, JD ORCID: 0000-0002-0872-3647, Akehurst, L, Smith, J and Hillstrom, AP 2018 , 'CCTV Observation: The Effects of Event Type and Instructions on Fixation Behaviour in an Applied Change Blindness Task' , Applied Cognitive Psychology, vol. 32 , pp. 4-13 , doi: 10.1002/acp.3372.

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Abstract

Little is known about how observers’scanning strategies affect performance when monitoring events in closed-circuittelevision (CCTV) footage. We examined the fixation behaviour of change detectors and non-detectors monitoring dynamic scenes.One hundred forty-seven participants observed mock CCTV videos featuring either a mock crime or no crime. Participants wereinstructed to look for a crime, to look for something unusual or simply to watch the video. In both videos, two of the peopledepicted switched locations. Eye movements (the number of fixations on the targets and the average length of each fixation ontargets) were recorded prior to and during the critical change period. Change detection (24% overall) was unaffected by eventtype or task instruction. Fixation behaviour differed significantly between the criminal and non-criminal event conditions. Therewas no effect of instructions on fixation behaviour. Change detectors fixated for longer on the target directly before the change thandid non-detectors. Although fixation behaviour before change predicted change detection, fixation count and durations during thecritical change period did not. These results highlight the potential value of studying fixation behaviour for understanding changeblindness during complex, cognitively demanding tasks (e.g. CCTV surveillance).

Item Type: Article
Authors/Creators:Graham, G and Sauer, JD and Akehurst, L and Smith, J and Hillstrom, AP
Keywords: change blindness, CCTV, eye movements
Journal or Publication Title: Applied Cognitive Psychology
Publisher: John Wiley & Sons Ltd
ISSN: 0888-4080
DOI / ID Number: 10.1002/acp.3372
Copyright Information:

Copyright © 2017 John Wiley & Sons, Ltd.

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