De Valois

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A collection of about 200 actinomycete strains was screened for the ability to grow on fragmented Phytophthora mycelium and to produce metabolites that inhibit Phytophthora growth. Thirteen strains were selected, and all produced (beta)-1,3-, (beta)-1,4-, and (beta)-1,6-glucanases. These enzymes could hydrolyze glucans from Phytophthora cell walls and cause(More)
Analysis of response patterns of LGN cells. Quantitative analysis of a population of cells in macaque LGN provides evidence for four types of spectrally opponent cells, and two types of non-opponent cells. Non-opponent cell responses agree quantitatively with behavioral measures of luminosity; spectrally opponent cells account for the perception of(More)
(2015). Two objects or one? Similarity rather than complexity determines objecthood when resolving dynamic input. Rights statement This article may not exactly replicate the final version published in the APA journal. It is not the copy of record. Take down policy If you believe this document infringes copyright, raise a complaint by contacting(More)
Imagine yourself running through rough terrain, perhaps fleeing a predator, or perhaps chasing after prey. Your visual system does not have time to scrutinize the countless trees, rocks, and other objects you pass by. What you need most is enough spatial information to avoid obstacles, to orient yourself , to pick a path. In this situation, even a rough(More)
In the present work, we study the influence of the polarity in the temporal processing of the red-green and yellow-blue chromatic opponent signals at suprathreshold isoluminance conditions. Circular random step-wise stimuli were presented in relation to a 15 candela per square meter (cd/m 2) achromatic reference stimuli. We select stimuli according to the(More)
  • Everson, B W Sirovich, L Kaplan, Shoham, A Bonhoeffer, T Spatio +25 others
  • 2003
motion, both the orientation and the axis of motion were different by 908 between the subtracted stimuli. For example, the response to a texture with 458 oriented bars moving horizontally was subtracted from the response to a texture with 1358 oriented bars moving vertically. Results obtained with difference imaging were verified with single-condition(More)
statistics of contours in natural environments. Image Massachusetts Institute of Technology analysis (Figure 1) reveals that the distribution of ori-Cambridge, Massachusetts 02139 ented contours is biased toward horizontal and vertical edges relative to the obliques (e.g., Switkes et al., 1978; Coppola et al., 1998a). This asymmetry raises the ques-Summary(More)
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