- Stereomotion Speed Perception
Or How to Catch a Bullet With Your Teeth
-
- Date: 02/10/00
- Time: 12:00 p.m.
- Location: Bldg.262/Rm.110
- Speaker: Dr Kevin Brooks
- University
of Sussex
When an object approaches an observer,
there are a number of cues to its motion, which can be divided
into monocular and binocular classes. Monocularly, image size
increases as a function of time. It has been shown that for a
small, rapidly moving object, such cues are relatively weak,
compared with binocular cues, with which this work is concerned.
Binocular information about motion in depth,
or 'stereomotion', can be further sub-divided into two seperate
cues which coincide in natural examples of MID. As an object
approaches, i) its binocular disparity changes and ii) the images
on each retinatranslate in opposite directions. Theoretically,
stereomotion perception could involve one or both of these cues,
which will be referred to as the changing disparity cue and the
inter-ocular velocity difference (IOVD) cue respectively.
This talk presents evidence from 4 psychophysical
investigations into the processing of stereomotion speed, concluding
that both cues are used, though their relative potency depends
critically on the range of
disparities concerned. |
