`̀ In this chapter we argue that many current spatial metaphors, such as `positionality', `locality', `grounding', `displacement', `territory', `nomadism', and so forth require urgent critical scrutiny. The appeal of these spatial metaphors lies precisely in the new meaning they impart, but it is increasingly evident that these metaphors depend overwhelmingly on a very specific and contested con...

Five normal subjects were tested in a simulated grasping task. A cylindrical container filled with water was placed on the center of a horizontal monitor screen. Subjects used a precision grip formed by the thumb and index finger of their right hand. After a preliminary run during which the container was present, it was replaced by an image of the upper surface of the cylinder appearing on the ...

The cognitive radio (CR) technology appears as an attractive solution to effectively allocate the radio spectrum among the licensed and unlicensed users. With the CR technology the unlicensed users take the responsibility of dynamically sensing and accessing any unused channels (frequency bands) in the spectrum allocated to the licensed users. As spectrum sensing consumes considerable energy, p...

Compared with its ASEAN neighbors, Vietnam appears to have weathered the Asian crisis quite well. Official statistics indicate a GDP growth rate of 6.6 per cent for the first half of 1998; export growth remains positive, and the dong has depreciated by only 20 per cent against the USD. But the relatively favorable picture has more to do with controls than with sound economic fundamentals. In th...

http://www.sciencemag.org/cgi/content/full/304/5674/1160 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/304/5674/1160/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http:/...

Surprisingly little is known of the perceptual consequences of visual or vestibular stimulation in updating our perceived position in space as we move around. We assessed the roles of visual and vestibular cues in determining the perceived distance of passive, linear self motion. Subjects were given cues to constant-acceleration motion: either optic flow presented in a virtual reality display, ...

The aim of the present study was to assess the effects of dopaminergic medication on the selection-for-action mechanisms in Parkinson’s disease (PD). PD subjects were tested after not having taken medication for at least 12 h ("Off" state) and then retested 1-2 h after medication ("On" state). A three-dimensional kinematic system (ELITE, BTS, Italy) was used to record reach-to-grasp movements t...

Rationale: Prepulse inhibition (PPI) of the startle response refers to an attenuation in response to a strong stimulus (pulse) if this is preceded shortly by a weak non-startling stimulus (prepulse). Patients with schizophrenia have repeatedly been found to show reduced PPI when compared to healthy people. Anticholinergic drugs are often used to control extrapyramidal symptoms induced by antips...