John Jones

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This paper deals with the problem of assigning meaning to the interaction of a user with a command-driven system such as UNIX. This research is part of the construction of an active intelligent help system that monitors users in order to offer spontaneous help when they are facing problems. In order to ensure this, the help system must build and maintain a(More)
We explored the claim that structural priming is a case of implicit learning within the language production system. The experiment began with a baseline phase, in which we assessed participants' rates of production for double object and prepositional object constructions. Then participants were biased toward the production of either the double object or(More)
Visual search efficiency is increased when the search target's identity is revealed incrementally via language while the display is in view. One view posits that search efficiency is increased because language enhances perceptual processing. We examined an alternative view that increased efficiency is due to delaying the onset of target-seeking eye(More)
An empirical study undertaken on a cross-section of UNIX users at an academic site reveals a role for an active form of help system, rather than the more usual passive kind. Sample scripts supporting this view are presented and the kind of aid required for these examples is discussed. It is then proposed that to provide such aid requires the construction(More)
Locating a target in a visual search task is facilitated when the target location is repeated on successive trials. Global statistical properties also influence visual search, but have often been confounded with local regularities (i.e., target location repetition). In two experiments, target locations were not repeated for four successive trials, but with(More)
—Respiratory motion correction degrades quantitatively and qualitatively Nuclear Medicine images. We propose that adaptive approaches are required to correct for the irregular breathing patterns often encountered in the clinical setting, which can be addressed within a Bayesian tracking formulation. This allows inference of the hidden organ configurations(More)
Recent studies attribute top-down control as the primary determinant of the speed with which attention can be disengaged from an object, and disengagement has received increased interest as a means to distinguish between top-down and bottom-up accounts of attention capture. We present the results of three experiments exploring the breadth of the(More)
—Nuclear Medicine (NM) imaging is an important diagnostic tool, used widely in the field of oncology amongst others. However, NM images suffer from significant blurring due to inevitable patient motion, such as breathing, coughing and other voluntary or involuntary movement. Advances in detector technology and reconstruction techniques have led to a steady(More)