Colour images 4 Human Factors, Security and Safety

Searching for threat: factors determining performance during CCTV monitoring

Christina Howard, Tomasz Troscianko, Iain Gilchrist, Ardhendu Behera & David Hogg
Universities of Bristol and Leeds

Extra to paper in D. de Waard, J. Godthelp, F.L. Kooi, and K.A. Brookhuis (Eds.), (2009). Human Factors, Security and Safety (pp. 333 – 339). Maastricht, the Netherlands: Shaker Publishing.

Colour images

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Figure 1. Scenes similar to those typically captured by CCTV. Even in this relatively sparse display of only four static scenes, cognitive and perceptual load is clearly high, and may result in missed incidents or late detection

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Figure 2.Sample fixation data shows the position of the eyes for eleven observers at a single point in time. The top panel shows a time at which the between-observer consistency is low. The bottom panel shows a time at which between-observer fixations are highly consistent, indicating an event of significant interest for observers