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The detection of sounds that come from a region of space recently exposed to acoustic stimulation is often slower than the detection of sounds coming from regions of space previously unexposed to acoustic stimulation. The relative increase in reaction time (RT) to targets in recently stimulated locations is generally termed "inhibition of return" (IOR).(More)
Reaction time (RT) to visual targets is lengthened following non-informative cues presented in the same location, or in different locations but in the same hemifield as the targets. RT lengthening is best accounted for by the voluntary suppression of an overt orienting toward the location of the cue: this veto produces an inhibition of the overall motor(More)
Six ordinary and one Siamese cat were tested for spatial frequency contrast sensitivity and for flicker discrimination thresholds. The Siamese cat was markedly impaired in the former task but performed normally in the latter. This result is consistent with single-cell physiological evidence showing an abnormally high Y/X cell ratio in the area centralis of(More)
Two parallel visual systems, the magnocellular (M) and parvocellular (P) pathways, originate from different types of retinal ganglion cells, and are known to be segregated in different portions of the pregeniculate visual pathways. Their relative contribution to two main cortical streams, dorsal and ventral, is still under discussion, but it is reasonable(More)
As news stories continue to demonstrate, ensuring adequate security and privacy in a networked "always on" world is a challenge; and while open source software can mitigate problems, it is not a panacea. This panel will bring together experts from industry and academia to debate, discuss, and offer opinions -- questions might include: What are the "costs"(More)
Evolution of existing large telecommunications software currently became an important issue. Efficient methods are needed to componentize existing software-identify existing components and gradually improve their boundaries and interfaces. We describe our approach to componentization, which involves precise yet high-level models of existing software.(More)
There is abundant psychophysical evidence in humans suggesting the existence of parallel pathways subserving different aspects of vision. However, there is little direct proof of the neural structures underlying the two pathways. We present direct anatomical evidence that in the normal human optic tract fibres are segregated according to size. Large axons,(More)