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SUMMARY:Computational Neuroscience Journal Club - Alec Greaves-Tunnell (Un
 iversity of Cambridge)
DTSTART:20150224T160000Z
DTEND:20150224T170000Z
UID:TALK58145@talks.cam.ac.uk
CONTACT:Guillaume Hennequin
DESCRIPTION:Alec Greaves-Tunnell will cover:\n\n* Image statistics underly
 ing natural texture selectivity of neurons in macaque V4\n* Gouki Okazawa\
 , Satohiro Tajima and Hidehiko Komatsu\n* http://www.pnas.org/content/112/
 4/E351.full\n\nOur daily visual experiences are inevitably linked to recog
 nizing the rich variety of textures. However\, how the brain encodes and d
 ifferentiates a plethora of natural textures remains poorly understood. He
 re\, we show that many neurons in macaque V4 selectively encode sparse com
 binations of higher-order image statistics to represent natural textures. 
 We systematically explored neural selectivity in a high-dimensional textur
 e space by combining texture synthesis and efficient-sampling techniques. 
 This yielded parameterized models for individual texture-selective neurons
 . The models provided parsimonious but powerful predictors for each neuron
 ’s preferred textures using a sparse combination of image statistics. As
  a whole population\, the neuronal tuning was distributed in a way suitabl
 e for categorizing textures and quantitatively predicts human ability to d
 iscriminate textures. Together\, we suggest that the collective representa
 tion of visual image statistics in V4 plays a key role in organizing the n
 atural texture perception.
LOCATION:Cambridge University Engineering Department\, CBL\, BE-438 (http:
 //learning.eng.cam.ac.uk/Public/Directions)
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