Dialogues on Perception by Bela Julesz

By Bela Julesz

Popular for his paintings intensive conception and trend attractiveness, Bela Julesz originated the techniques--involving computer-generated random-dot stereograms, cinematograms, and textures--that ended in the subfield of human psychology referred to as "early vision." during this booklet, Julesz elucidates the guidelines and insights generated by means of this intriguing paradigm in a sequence of dialogues among Julesz the naif and Julesz the scientist. those playful, own, deeply trained dialogues, although tough, are by no means past the succeed in of the overall medical reader attracted to mind study. one of the themes lined are stereopsis, movement belief, neurophysiology, texture and auditory notion, early imaginative and prescient, visible cognition, and laptop imaginative and prescient. Julesz's paintings on early imaginative and prescient and focal cognizance is the root of the discussions, yet he's both relaxed recounting his debate with John Searle and describing his interactions with Salvador Dali. He additionally addresses creativity, arithmetic, theories, metascientific questions, maturational home windows, and cortical plasticity, relates his present paintings to previous findings and ideas, and considers how a few strategic questions may be solved with latest instruments.

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In iso-second-order texture pairs, the second-order statistics are identical; hence, the correlation (a simpler parameter, derived from the second-order statistics) must be identical, too. From 1962 till 1976 page_51 Page 52 we found no discrimination in such texture pairs, until the discovery of the first textons (Caelli and Julesz 1976). These textons made iso-second-order texture pairs discriminable for the first time, based on some local features. For a while texture pairs with identical second-order statistics (and correlation, hence, the Fourier power spectra) could not be told apart.

Whereas the Xs among the Ls pop out effortlessly, finding the Ts among the Ls requires an element-by-element search. From Julesz and Bergen 1983. page_48 Page 49 color matching is such a simple process that two different perceptual modes cannot manifest themselves. Textons have no perceptual significance in themselves, but only with respect to other textons. 4, we can observe that the textons of crossing formed by the orthogonal line segments in the area of Xs allow this area to pop out preattentively from the surrounding area of Ls, where the same orthogonal line segments do not cross.

After all, the selected catastrophe occurs millions of times a second, as the algorithm that is executed by the computer unfolds. So, the algorithm is the only significant event. So much for the application of catastrophe theory to psychobiology. I was even less excited by the advent of chaos theory. I found Feigenbaum's insights into finding some general principle behind many different deterministic systems' chaotic behavior unexpected, but not as unfamiliar as it might have been for a physicist accustomed to well-behaved pendulum and planetary movements.

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