jimi
Well-known member
I quote from his profile
Balding, but lately hairy chinned, old git.
Balding, but lately hairy chinned, old git.
Is Stugeron Steve a bearded baldie now?
- Thread starter jimi
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StugeronSteve
New member
The way it's coming along I should be able to have a head inversion in no time at all.
jimi
Well-known member
Perception of head orientation.
Wilson HR, Wilkinson F, Lin LM, Castillo M.
Visual Sciences Center, University of Chicago, IL 60637, USA. hrw6@midway.uchicago.edu
There are two visual components to gaze: head orientation and orientation of the eyes relative to the head. This study explores the accuracy with which subjects can discriminate head orientation when the eyes are centered in the head. Discrimination thresholds averaged 1.9 degrees of head rotation for base head orientations of 0 degree and 15 degrees, but discrimination was markedly poorer around a 30 degrees head orientation. Results were independent of spatial frequency and size over a 4-fold range. Neither negative contrast nor head inversion affected discrimination. Experiments dissociating the internal features from head outline revealed the presence of two main cues to discrimination: deviation of the head profile from bilateral symmetry, and deviation of nose orientation from vertical. Simulations show that model V4 units revealed in previous experiments with Glass patterns can extract the relevant head orientation information. The data are consistent with neurological data indicating a selective loss of face recognition in prosopagnosia with spared gaze discrimination.
Erm .. so you're now going to hit everyone with a baseball bat?
Wilson HR, Wilkinson F, Lin LM, Castillo M.
Visual Sciences Center, University of Chicago, IL 60637, USA. hrw6@midway.uchicago.edu
There are two visual components to gaze: head orientation and orientation of the eyes relative to the head. This study explores the accuracy with which subjects can discriminate head orientation when the eyes are centered in the head. Discrimination thresholds averaged 1.9 degrees of head rotation for base head orientations of 0 degree and 15 degrees, but discrimination was markedly poorer around a 30 degrees head orientation. Results were independent of spatial frequency and size over a 4-fold range. Neither negative contrast nor head inversion affected discrimination. Experiments dissociating the internal features from head outline revealed the presence of two main cues to discrimination: deviation of the head profile from bilateral symmetry, and deviation of nose orientation from vertical. Simulations show that model V4 units revealed in previous experiments with Glass patterns can extract the relevant head orientation information. The data are consistent with neurological data indicating a selective loss of face recognition in prosopagnosia with spared gaze discrimination.
Erm .. so you're now going to hit everyone with a baseball bat?
StugeronSteve
New member
Re: Perception of head orientation.
Not really, just thought that I might be able to get the skin tugged round through 180 deg. Mind you there's always the baseball bat if things don't work out.
Not really, just thought that I might be able to get the skin tugged round through 180 deg. Mind you there's always the baseball bat if things don't work out.
Sgeir
Well-known member
Important Poll for Male Forumites