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Damian Poulter1, John Wann1, Catherine Purcell1, Kate Wilmut2 1Royal Holloway, University of London, UK 2Oxford Brookes University, UK Introduction D t ti f l i i iti l f f l lli i id Experiment 2: TTC 3s A h t li ti i f t d i t t li ti d Experiment 5: Object size Looming thresholds for objects of different si es ere in estigated • e ec on o oom ng s cr ca or success u co s on avo ance. •Regan et al (1973 – 96) has been foremost in documenting humans’ sensitivity to looming and MiD. •Regan & Beverley (1979) reported thresholds for looming lower than 0.02 deg/s. •Hoffman (1994) determined angular velocity threshold at 0.11 deg/s (0.002 rad/s) for adults watching videos of approaching vehicles. •Various methodological factors make it difficult to extrapolate from these measures f i l i • p o o-rea s c mage o a car was presen e aga ns a na ura s c roa scene background (see Fig. 2 below) • A simulated TTC of 3s was used (n = 7) critical decision point after which crossing would involve risk of collision. • Looming thresholds slightly higher with vehicle displacement (M = 0.159, SD = 0.079), but not significantly different from no_motion threshold (M = 0.101, SD = 0.031). • Looming threshold with scene rotation (M = 0.446, SD = 0.149) was significantly higher th b th ti d di l t th h ld • z w v . •Participants (n = 3) viewed photo-realistic image of a car and a motorbike presented against road scene background •Simulated TTC of 3s was used critical decision point after which crossing would involve considerable risk of collision. •There was a similar pattern of looming thresholds for car & motorbike under any condition (see Table 1). Note that a higher threshold for m_bikes means that these d t b t lli SLOWER th t b d t t d Thi b b t d to per ormance n natura sett ngs. •The current study was concerned with looming thresholds in the context of roadside behaviour and aimed to dissociate detection of looming from simple detection of edge motion, by including lateral horizontal and vertical displacement of the image as well as isotropic expansion.

Looming detection within natural scenes and potential errors in roadside judgments