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SUMMARY:Methods and mechanisms of motion dazzle - Anna Hughes\, PDN Cambri
 dge
DTSTART:20151104T130000Z
DTEND:20151104T140000Z
UID:TALK60675@talks.cam.ac.uk
CONTACT:John Mollon
DESCRIPTION:`Motion dazzle' is the hypothesis that certain types of patter
 ns\, such as high contrast stripes and zigzags\, can cause misperceptions 
 in the speed and direction perception of moving targets. Motion dazzle is 
 relevant to both ecological questions\, including why striped patterning m
 ay have evolved in animals such as zebras\, and also for camouflage design
  for human purposes. We have used an interdisciplinary approach to address
  questions about motion dazzle in human subjects\, combining techniques fr
 om psychophysics and behavioural ecology. We have focused on what aspects 
 of a target are important in creating motion dazzle effects and what speci
 fic perceptual errors are observed\, with a view to understanding the phen
 omena at a mechanistic level. Using touch screen technology\, we have repl
 icated work showing that targets with striped markings are amongst the har
 dest for humans to capture\, but that these effects depend upon the orient
 ation of the stripes and whether multiple targets are present. We have als
 o made measurements of speed and direction judgements for targets with dif
 ferent patterning using psychophysical techniques. Subjects show small but
  consistent speed and direction judgement errors that depend upon static s
 tripe orientation relative to the direction of motion. Motion dazzle may t
 herefore be an effective camouflage strategy caused by several different m
 isperceptions\, not all of which have been previously reported. 
LOCATION:Kenneth Craik Room\, Craik-Marshall Building\, Downing Site
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