The authors describe ACT-R/perceptual-motor (ACT-R/PM), an integrated theory of cognition, perception, and action that consists of the ACT-R production system and a set of perceptual-motor modules. Each module (including cognition) is essentially serial, but modules run in parallel with one another. ACT-R/PM can model simple dual tasks such as the psychological refractory period (PRP), includin...

We give new examples of discrete Schrδdinger operators with potentials taking finitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

Most studies using the psychological refractory period (PRP) design suggest that dual-task performance is limited by a central bottleneck. Because subjects are usually told to emphasize Task 1, however, the bottleneck might reflect a strategic choice rather than a structural limitation. To evaluate the possibility that central operations can proceed in parallel, albeit with capacity limitations...

The history of architecture is not only the past. invisible presence absence – «imprints», «traces» disappeared cultures past civilizations, allow us to better understand our present. genesis development during formation feudalism and historical environment in which a peculiar fortified castles was formed, reflecting peculiarities worldview, local conditions tasks fortification, subject object ...

Today the city of Ḫarrān/Carrhae is mainly known for famous battle, in which Roman general Crassus was defeated by a Parthian army 53 BCE. However, Ḫarrān also one most important religious centres North Mesopotamia. Since Bronze Age, moon god Sîn popular wider region, and it well that late Assyrian Baby- lonian kings supported cult rebuilt temple Sîn. Archaeological evidence written sources att...

Abstract Late Sanskrit lardayati ‘to load’ is probably not inherited from a PIE root *lerd-, as has recently been argued by Kaczyńska (2020), but can be explained denominative of *larda- ‘load, cargo’. This noun could borrowing Bactrian *λιρτο /lirtə/ cargo’ < Old Iranian *dr̥šta-. etymology fits well with the fact that phrased together sthora- ‘pack-animal’, likely another instantiation coll...