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SUMMARY:Psychophysical tests of human visual encoding models - Prof. Thoma
 s S. A. Wallis\, Technical University of Darmstadt
DTSTART:20240321T140000Z
DTEND:20240321T150000Z
UID:TALK209692@talks.cam.ac.uk
CONTACT:Rafal Mantiuk
DESCRIPTION:The human visual system compresses the information about the w
 orld implicit in the light entering our eyes. Decades of research in visio
 n science has provided good hypotheses for the features that are encoded b
 y the early visual system and made available for cognition and action. One
  approach to testing these hypotheses uses analysis by synthesis: one can 
 generate artificial image stimuli that should differentiate competing enco
 ding accounts\, or for which an encoding account makes a strong prediction
  about discriminability. A classical example from vision is colour metamer
 ism. Two spectrally-distinct surfaces will appear to be the same colour as
  long as the ratios of cone activations are identical (and context is comp
 arable). I will present work extending this concept to the discriminabilit
 y of photographic scenes. I will show examples from past work in which we 
 used this logic to psychophysically test a popular analogy for vision in t
 he periphery\, as that of a "texture-like" representation. We find two ext
 ant models fail to adequately capture image discriminability\, and we spec
 ulate about what ingredients might be missing. Ongoing work extends this u
 sing a data-driven approach\, and expands to test other models. Overall\, 
 classical psychophysical methods combined with hypotheses from vision scie
 nce and modern tools in image synthesis provide a powerful approach to tes
 t the functional encoding of visual information.\n\nZoom link: https://cam
 -ac-uk.zoom.us/j/84318599913?pwd=WmxmYXpMSCtzeG0rakdaZzZ6Z2R5dz09\n
LOCATION:SS03 - William Gates Building
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