BISC Seminar, November 20, 1997, 4-5pm, 310 Soda Hall

Frank Hoffmann (
Mon, 17 Nov 1997 02:04:35 +0100 (MET)

B I S C S e m i n a r A n n o u n c e m e n t

Evidence for the Scanpath Theory of Top-Down Visual Perception

Professor Lawrence W. Stark
University of California at Berkeley

November 20th, 1997
310 Soda Hall


Philosophers have long speculated that we "see in our mind's eye",
but until the "scanpath theory", little evidence supported this conjecture.
The scanpath theory (1971) suggested that a top-down internal cognitve
model of what we "see" controls not only our visual perception, but also drive the sequences of rapid eye movements and fixations, or glances, that
so efficiently travel over a scene or picture of interest. The contrary belief is that features of the external world control eye fixations and vision in a bottom-up mode by impinging on the retina and sending signals to the brain.

The evidence and supporting arguments consist of : ----
1.- experiment eye movement recordings of subjects making scanpath sequences
2.- quantitative analyses of scanpaths using various distance measures and parsing of constraints in different experiments
3.- a robotic autonomous vision scheme that explicates and makes concrete the unanchored (in brain anatomy) processes that compose the scanpath theory
4.- Neurological evidence from MRI and from neurophysiology as to the intersection of top-down and bottom-up visual processes
5.- demonstrations of illusions that negate the naive realist bottom-up intuitive conjectures
6.- a test of computer vision algorithms to mimic bottom-up vision
7.- philosophical explanation of the processes of perception and of epistemology

Please direct questions with regard to the contents of the talk
and request for papers to the speaker.

Frank Hoffmann UC Berkeley
Computer Science Division Department of EECS
Email: phone: 1-510-642-8282
URL: fax: 1-510-642-5775