3Vivek Nityananda
2Ignacio Serrano-Pedraza
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Worldwide decomposition rates depend both on climate and the legacy of plant functional traits as litter quality. To quantify the degree to which functional differentiation among species affects their litter decomposition rates, we brought together leaf trait and litter mass loss data for 818 species from 66 decomposition experiments on six continents. We(More)
Stereoscopic depth perception is a fascinating ability in its own right and also a useful model of perception. In recent years, considerable progress has been made in understanding the early cortical circuitry underlying this ability. Inputs from left and right eyes are first combined in primary visual cortex (V1), where many cells are tuned for binocular(More)
Stereo or '3D' vision is an important but costly process seen in several evolutionarily distinct lineages including primates, birds and insects. Many selective advantages could have led to the evolution of stereo vision, including range finding, camouflage breaking and estimation of object size. In this paper, we investigate the possibility that stereo(More)
Stereopsis - 3D vision - has become widely used as a model of perception. However, all our knowledge of possible underlying mechanisms comes almost exclusively from vertebrates. While stereopsis has been demonstrated for one invertebrate, the praying mantis, a lack of techniques to probe invertebrate stereopsis has prevented any further progress for three(More)
The detection of a grating located in the periphery is impaired by the presence of a surrounding grating of same spatial frequency and orientation. This suppression is the psychophysical counterpart of the surround suppression found in the striate cortex that is orientation tuned and can be mediated dichoptically (De Angelis, et al 1994). The proposed(More)
Depth perception from binocular disparity depends upon correctly matching image features seen by the left and right eyes. A local cross-correlation between left and right images, similar to the operation of the binocular energy model, is a good candidate mechanism. Recently, Doi et al. (2011, 2013, 2014) showed that human observers can detect depth in(More)
The existence of multiple channels selective for spatial frequency in human motion perception has been shown by masking experiments (Anderson & Burr, 1989). We examined this in humans and praying mantises. The "signal" stimuli were vertically-oriented sinusoidal luminance gratings of either Low or High spatial frequency, moving either left or right with a(More)
—Simulating spatiotemporal neurons is fundamental to understanding motion detection mechanisms in the primary visual cortex and cloning these mechanisms in digital systems. We present a hardware accelerator that leverages the parallelism of a modern Field Programmable Gate Array (FPGA) to increase the speed of spatiotemporal computations by 1∼2 orders of(More)
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