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SUMMARY:Tracking\, Memory\, and Dynamic Icons - Dr. Srimant P. Tripathy\, 
 Department of Optometry\, University of Bradford
DTSTART:20080221T130000Z
DTEND:20080221T140000Z
UID:TALK9812@talks.cam.ac.uk
CONTACT:John Mollon
DESCRIPTION:Thresholds for detecting a deviation in a bilinear target traj
 ectory are severely elevated when other linear distractor trajectories are
  presented simultaneously (Tripathy & Barrett\, 2004\, _Journal of Vision_
 \, 4\, 1020-1043). Here we investigate the possibility that persistence of
  these trajectories in sensory memory may play a crucial part in determini
 ng performance in this task. We measured deviation thresholds for stimuli 
 that were similar to those in the original study\, but with the following 
 variations:\n* the target trajectory was cued at the start of the trial\n*
  the target trajectory was cued halfway through the trial (to determine if
  the earlier parts of the target trajectory were retained in memory)\n* th
 e entire trajectory was presented statically in a “single shot” mode\,
  eliminating the need for parts of the stimulus to be retained in memory f
 or the length of time needed to traverse the trajectory\n* variable delays
  were introduced halfway through the trajectory in order to study the rate
  of decay of the trajectories in memory\n* the first half of the trajector
 y was masked at different SOAs following the deviation of the target.\n\nI
 n all of these cases\, the performance of human observers was consistent w
 ith a sensory-memory-based limit to performance. Parallels with the Partia
 l Report paradigm (Sperling\, 1960\, _Psychological Monographs: General an
 d Applied_\, 74(11)\, 1-29) will be discussed\, keeping in mind the dynami
 c nature of our stimuli and the context of multiple object tracking.\n
LOCATION:Ground Floor Lecture Theatre\, Department of Experimental Psychol
 ogy
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